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The Farm and Ranch Report

Required Training Offered for Fruit and Vegetable Growers . . .

 If you are a fruit and/or vegetable grower, you are required by law, pursuant to the Food Safety Modernization Act (FSMA) that requires “At least one supervisor or responsible party for your farm must have successfully completed food safety training at least equivalent to that received under standardized curriculum recognized as adequate by the Food and Drug Administration.” The good news is that a one-day Grower Training Course, designed to satisfy this FMSA produce safety rule requirement, will be offered locally, at the OSU-IAB (on Sam Noble Parkway/Hwy. 199, about ½ mile east of the Southern Technology Center) on June 7, beginning at 8:30 am. The training is offered and conducted by the OSU Food & Agricultural Products Center (FAPC) staff.

Fruit and vegetable growers and others will receive information about:

· Produce Safety

· Food Safety Modernization Act (FSMA) Produce Safety Rule

· Good Agricultural Practices (GAPs)

· Co-management of Natural Resources

· Food Safety

The cost is $15/person for Oklahoma residents and includes lunch, snacks, and materials. Registration can be found online at fapc.biz/workshops/produce-safety-alliance-grower-training-course or to register and pay by phone you may call Karen Smith at 405-744-6277.

 Last Call for Ranch Tour! . . . If you are interested in this unique opportunity to see some of south-central Oklahoma’s more notable ranches, and learn from some progressive beef cattle producers, registration will likely close Monday, May 28.

Cost is $30 per participant. Online registration is available at http://www.ansi.okstate.edu/marketplace through the OSU Department of Animal Science.

On May 30, the vans will depart at 12:15 p.m. from the Ardmore Convention Center, located at 2401 Rockford Rd. and travel to the Chuckwagon Barbecue Restaurant, located at 101 Hargrove St. and State Highway 7 in Velma, prior to continuing on to the first ranch site.

 Out of respect to our gracious ranch hosts and in the interest of logistics, we ask participants to ride in the vans provided. If you must caravan in your own vehicle, please drive a pickup able to handle the terrain and carpool as much as possible.

The vans will return to the Ardmore Convention Center at approximately 8 p.m. The second day of the tour will kick off at 8 a.m. and finish early in the afternoon of May 31.

Ranch sites on the tour include Sugar Loaf Ranch in Velma, Sparks Ranch in Hennepin, Coffey Ranch in Davis, Daube Ranch in Ardmore, Eddie Parker Angus Ranch in Waurika, Wilson Cattle Company in Ringling and Howard Cattle Company in Claypool.

Anyone interested in obtaining additional information about the tour should contact me by email at leland.mcdaniel@okstate.edu or by phone at either 580-223-6570 or 580-228-2332, or visit my Facebook page.

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Find out what is happening in OSU Extension at https://calendar.okstate.edu/oces/

Oklahoma State University, in compliance with Title VI and VII of the Civil Rights Act of 1964, Executive Order 11246 as amended, and Title IX of the Education Amendments of 1972 (Higher Education Act), the Americans with Disabilities Act of 1990, and other federal and state laws and regulations, does not discriminate on the basis of race, color, national origin, genetic information, sex, age, sexual orientation, gender identity, religion, disability, or status as a veteran, in any of its policies, practices or procedures.  This provision includes, but is not limited to admissions, employment, financial aid, and educational services. The Director of Equal Opportunity, 408 Whitehurst, OSU, Stillwater, OK 74078-1035; Phone 405-744-5371; email: eeo@okstate.edu has been designated to handle inquiries regarding non-discrimination policies.  Any person who believes that discriminatory practices have been engaged in based on gender may discuss his or her concerns and file informal or formal complaints of possible violations of Title IX with OSU’s Title IX Coordinator 405-744-9154.

Register Now for May 30-31 Ranch Tour! . . .

Beef cattle producers in Oklahoma will have the opportunity to learn first-hand more about their industry by attending the 2018 Master Cattleman Ranch Tour on May 30 and 31. Any cattle producer may register and learn from some of the state’s master cattlemen and cattlewomen. The cost of the tour is only $30 and is presented by OSU Animal Science Department and the Carter/Jefferson County OSU Extension Offices.. 

This is a unique opportunity to see some very progressive, scenic, and historic beef cattle ranches of south-central Oklahoma.You will appreciate the environmental and ecological diversity that will be on display from ranch-to-ranch. Although the focus is on beef cattle production, including cow/calf, stocker, purebred seedstock, and backgrounding operations, it will also be an opportunity to see, up close and personal, some of the issues in this region of the state regarding invasive species (Eastern red cedar), groundwater/surface water resources (Arbuckle-Simpson Aquifer), and some very challenging landscape to implement control measures.

The ranches range in size from about 10,000 to 35,000 acres. There will be some interesting contrasts of vertical and horizontal integration, genetic selection, stocker health management, fall vs. spring calving seasons, winter feeding strategies, native range management, and the use of Rx fire to enhance animal performance, as well as controlling brush.

Please find the linked flier on the upcoming Master Cattleman Ranch Tour, presented by the OSU Animal Science Department and the Carter/Jefferson County OSU Extension Offices. For details about the seven ranches to be visited and key topics discussed, click on the link below to a flier that gives more important information about the tour:  http://beefextension.com/temp_files/2018MasterCattlemanRanchTour.pdf. In addition, there is an online registration link, that it will be limited to the first 100 registrants. Registration Link: http://www.ansi.okstate.edu/marketplace. Register now, don’t delay.

Comparing Weaning Dates for Fall-Born Calves . . .

Producers with fall-calving herds have traditionally weaned the calves at 9 to 10 months of age. When forage growth is limited due to drought, questions arise about the feasibility of weaning the calves at an earlier date. The effect on the cow as well as weaning weight of the calf must be considered when the impact of the weaning date is considered.

Oklahoma State University animal scientists evaluated weaning dates of 158 Angus fall-calving cows over a 4 year period. Cows were allowed to nurse their calves for about 210 days (April Weaning) or 300 days (July Weaning). All cows calved in September or October and were weaned in mid-April (April Wean) or mid-July (July Wean). April-weaned young cows had greater re-breeding percentages (98.4% versus 89.3%) than July weaned young cows. However, there was no advantage in the re-breeding performance of April-weaned mature cows compared to July-weaned mature cows (90.2% versus 96.7%). April-weaned cows were heavier and fleshier at calving than July weaned cows.

Calves weaned in July were 90 days older and 204 pounds heavier (642 lb versus 438 lb) when weaned than were the April-weaned calves. The April-weaned calves were allowed to graze native pasture after wean-ing and weighed 607 pounds in mid-July. For most years, it appears more advantageous to delay weaning of calves born to cows 4 years or older to July while maintaining April weaning for cows 3 years of age or younger.

Drought conditions (or burned pastures) in some areas of the Southern Plains very well may suggest the earlier weaning date could be considered for all ages of cows. In those areas of Oklahoma that have received adequate rainfall this winter and spring, the answer may be different. In those regions, the prospects of good forage growth would suggest that the later weaning date would result in heavier sale weights of calves and still excellent re-breeding of adult cows. Source: Hudson and co-workers. Journal of Anim. Sci. 2010 vol. 88:1577.

Bloat Management in Grazing Cattle . . .

Recent rains and warming temperatures has spawned a flush of growth on dormant and drought-stressed wheat pasture. With the new lush growth and increased intake often comes an increased risk of bloat.

Ruminants are able to consume so many different types of ingredients because the rumen serves as a large fermentation vat that houses microbes that break down feeds into nutrients. This is a very effective way to convert grass and grain to milk or meat. This fermentation process produces large amounts of gas, which could cause a digestive problem known as ruminal tympany, aka “bloat”.

Normally the rumen gas is expelled by eructation (belching). Any condition that interferes with that release will cause an over-distension of the rumen and reticulum. This condition is most common in cattle, but can occur in sheep and goats as well.

There are two main types of bloat and each one is caused by a different mechanism. The primary tympany is also known as frothy bloat. This frothy bloat is when the small bubbles of fermented gas is trapped in a stable foam, which cannot be eructated. This type of bloat most commonly occurs in two situations; the first being animals on pastures, especially pastures containing legumes such as clover or alfalfa. Legumes are rapidly digested in the rumen and this results in a high concentration of fine particles that tend to trap gas bubbles, but it is not only animal’s digestive system that contributes to this problem, it is also the attributes of the plants containing soluble proteins that act as foaming agents. Animals being exposed to new lush forage growth, or animals that are moved in and out of the pasture are more prone to bloating on pasture. The second situation that frequently causes a frothy bloat is animals in feedlot environment, especially when animals are being fed high levels of finely ground grains. Digestion of the grain increases due to the grinding which also produces a multitude of fine particles that can trap gas bubbles. In addition, there are some microbes that can produce an insoluble slime that aides in producing a stable foam when fed a high concentrate diet.

The secondary tympany or free gas bloat is caused when an animal cannot eructate (belch) the free gas built up in the rumen. This is largely due to an obstruction in the esophagus such as foreign bodies, abscesses or tumors. Another possibility might be the animal’s posture. Too often we find animals laying with their backs downhill, and in this position the animal cannot physically eructate.

The clinical signs of bloat are easy to identify on an animal, as there will be large protrusion of the rumen showing prominently on the animal’s left side. The animal will show signs of anxiety and rapid breathing possibly with their neck extended with their tongue out. Once an animal exhibits staggering and lays down, death will occur rapidly. If an animal is bloated, it can be treated by inserting a trocar and cannula through the side of the animal into the rumen cavity. If the cannula is inserted and provides some relief, an antifoaming agent such as vegetable oils or mineral oils should be administered through the cannula into the rumen. Another option could be to pass a stomach tube with a large bore down the animal’s esophagus. This is another great opportunity to administer an antifoaming agent. In either case watch the animal closely for the next couple of hours. For a frothy bloat, switching the animal to a higher roughage diet will be advisement. Reducing the incidence of bloat can be accomplished with pasture and feed management and/or through the use of Poloxalene, which can be fed as a topdressing on feed, in a grain mixture, in liquid supplements, or in molasses blocks. Because poloxalene is relatively expensive, some producers reduce the dosage or eliminate its use after livestock have been grazing pasture for several weeks or the conditions that favor the incidence of bloat decline. Another common management practices is to provide supplements or molasses blocks containing a bloat-reducing ionophore (example: Rumensin®).

Some animals are just more prone to bloat than others and some are even considered chronic bloaters. Management and a producer’s best efforts will not show much improvement in a chronic animal’s condition.

Find out what’s happening on the Oklahoma Cooperative Extension Calendar at https://calendar.okstate.edu/oces/#/?i=2

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Oklahoma State University, U.S. Department of Agriculture, State and Local Governments Cooperating. The Oklahoma Cooperative Extension Service offers its programs to all eligible persons regardless of age, race, color, religion, sex, sexual orientation, genetic information, gender identity, national origin, disability or status as a veteran, and is an equal opportunity employer.

Skid Steer Brush Control Considerations . . .

 With the recent increase in the popularity of skid steer attachments for brush removal, OSU has also seen an increase in the prevalence of questions related to chemically controlling re-sprouts that occur after the removal operation. While these pieces of equipment make the job easier, unfortunately, if used alone they also reduce the effectiveness of foliar herbicide applications on re-sprouting brush species in the near future.

While species such as Eastern redcedar can be fully controlled by cutting them below their green limbs, some species of trees will regrow from buds present on the crown or root. Examples of crown budding species are oak, hickory, elm and Osage orange, while commonly encountered root budding species are honey locust and persimmon. This indicates that while clipping these trees will temporarily remove them from the landscape, they will also re-sprout from existing rootstock and return in the very near future.

The shoots mirror the roots

In general agronomy terms, the shoots (aboveground plant portion) of an unmolested plant typically have similar mass to the roots. This basic of plant physiology allows for efficient uptake of foliar applied herbicides and subsequent translocation to the root system, achieving desired long-term control.

However, if we remove the top growth of a re-sprouting species, the ratio of leaf surface area in relation to root mass has been reduced drastically and sufficient root kill through a foliar application of herbicide is likely impossible. In addition, there is a disproportionately large root system now supplying the small “sprout” with all the elements needed for fast regrowth in the short term ( See Figure 1 below).

Over the next few years, although the re-sprout continues to grow extremely fast, the photosynthesis occurring in the leaves is insufficient to supply the energy needed by the large root mass and therefore a portion of the root system dies back to a sustainable level for the plant. It is at this point when foliar herbicide applications become an option on the table once more.

  For this reason, dealing with root or crown sprouting species necessitates these options in decreasing order of preference (combination of control level, time and economics):

1. Apply chemical to the freshly cut stump of re-sprouting tree species.

a. Usually mixed with fuel oil, apply within 30 minutes of cutting.

2. Use an approved product/method to control trees prior to mechanical removal.

a. This could include foliar sprays or basal treatments.

3. Apply a post-harvest soil active herbicide labeled for the offending species.

a. Relies on root uptake and therefore rainfall, not reliable on clay soils.

4. Allow at least 3-4 years of regrowth before using a foliar spray application.

a. Allows time for increased leaf area and decreased root mass.

5. Spray a broadcast treatment option for 2-3 years in a row on re-sprouts.

a. While effective, this method is costly.

So, if you’re contemplating using a skid steer for mechanical tree removal, they are a great option. However, remember to consider the growth habit of the tree species at hand before firing up. Identify what species are present and if they are notorious for re-sprouting. Determine the proper and least cost herbicide treatment for consistent root control. Some tree saw/shear options come with an onboard herbicide reservoir and pump, allowing you to treat the cut stump from the cab. (Source: Brian Pugh, OSU Extension Area Agronomist; June 2018 Timely Topics)

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Find out what is happening in OSU Extension at https://calendar.okstate.edu/oces/

Oklahoma State University, in compliance with Title VI and VII of the Civil Rights Act of 1964, Executive Order 11246 as amended, and Title IX of the Education Amendments of 1972 (Higher Education Act), the Americans with Disabilities Act of 1990, and other federal and state laws and regulations, does not discriminate on the basis of race, color, national origin, genetic information, sex, age, sexual orientation, gender identity, religion, disability, or status as a veteran, in any of its policies, practices or procedures.  This provision includes, but is not limited to admissions, employment, financial aid, and educational services. The Director of Equal Opportunity, 408 Whitehurst, OSU, Stillwater, OK 74078-1035; Phone 405-744-5371; email: eeo@okstate.edu has been designated to handle inquiries regarding non-discrimination policies.  Any person who believes that discriminatory practices have been engaged in based on gender may discuss his or her concerns and file informal or formal complaints of possible violations of Title IX with OSU’s Title IX Coordinator 405-744-9154.

When is the Best Time (Age) to Castrate Bull Calves? . . .

You are, no doubt, aware of the tragic wildfires in western Oklahoma. These have been particularly devastating events and Oklahomans, especially the farming and ranching community, is always quick to step up to assist those affected. While I am sure that they have many needs, we are told that items of particular need are hay, feed, milk replacer, fencing materials, and cash.

Cash donations may be sent to the following relief funds:

• Oklahoma Cattlemen’s Foundation – Make checks payable to Oklahoma Cattlemen’s Foundation with “Fire Relief” in the memo line and mail to P.O. Box 82395, Oklahoma City, OK 73148 or donate online at www.okcattlemen.org

• Oklahoma Farmers and Ranchers Foundation – Make checks payable to the Oklahoma Farmers and Ranchers Foundation with “Wildfire Relief” in the memo line and mail to 2501 N. Stiles, Oklahoma City, OK 73105 or donate online at www.okfarmingandranching.org

• Oklahoma Farmers Union Foundation – Make checks payable to Farmers Union Foundation, Inc., with “Wildfire Relief” in the memo line and mail to the attention of Wildfire Relief at P.O. Box 24000, Oklahoma City, OK 73124.

Cash donations may also be sent to volunteer fire departments, local churches, and voluntary organizations responding to the fires, including the American Red Cross and Oklahoma Baptist Disaster Relief.

The Oklahoma Cooperative Extension Service is organizing donations of fencing supplies, hay, supplemental livestock feed, and milk replacer for calves that lost their mothers. Anyone impacted by the fires and in need of these items may call Oklahoma State University Cooperative Extension at (405) 590-0106, (405) 496-9329 or (405) 397-7912. Anyone who would like to donate the items listed above may also the numbers above to offer donations. They will match up people who have items or services to donate with producers needing help to rebuild fences, transport hay and similar farm and ranch activities.

Other donated items are not needed or requested at this time. Do not send unsolicited donations of used clothing, miscellaneous items or perishable foods, which must be sorted, warehoused, transported and distributed. This requires more efforts and staffing to manage those resources and takes away from recovery efforts.

Because Carter and Jefferson counties are within the Red Imported Fireant quarantine area, any and all hay must be inspected by me or an official with the Oklahoma Department of Agriculture, Food, and Forestry (ODAFF). If you want to donate hay, please contact me via one of the Extension Office numbers; 223-6570 (Carter), 228-2332 (Jefferson) and we can make arrangements for me to inspect the hay. 

Below are some web links to other pertinent information:

http://www.dasnr.okstate.edu/…/fire-ant-quarantine-zone-add…

http://entoplp.okstate.edu/firean…/BaledHayIndustryAlert.pdf

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Find out what is happening in OSU Extension at https://calendar.okstate.edu/oces/

Oklahoma State University, in compliance with Title VI and VII of the Civil Rights Act of 1964, Executive Order 11246 as amended, and Title IX of the Education Amendments of 1972 (Higher Education Act), the Americans with Disabilities Act of 1990, and other federal and state laws and regulations, does not discriminate on the basis of race, color, national origin, genetic information, sex, age, sexual orientation, gender identity, religion, disability, or status as a veteran, in any of its policies, practices or procedures.  This provision includes, but is not limited to admissions, employment, financial aid, and educational services. The Director of Equal Opportunity, 408 Whitehurst, OSU, Stillwater, OK 74078-1035; Phone 405-744-5371; email: eeo@okstate.edu has been designated to handle inquiries regarding non-discrimination policies.  Any person who believes that discriminatory practices have been engaged in based on gender may discuss his or her concerns and file informal or formal complaints of possible violations of Title IX with OSU’s Title IX Coordinator 405-744-9154.

OQBN Saw Strong Premiums in 2017 . . .

 Oklahoma Quality Beef Network’s (OQBN) participating producers during the fall 2017 sale season benefitted from strong premiums for their efforts. Just over 10,000 calves were enrolled in OQBN’s Vac45 program, with approximately 6700 of those calves marketed through OQBN’s special sales at participating livestock markets. The remaining calves were direct marketed by producers. Data was collected on 12,582 calves (including OQBN calves) at 8 sales across Oklahoma. OQBN premiums were strong, at an average of $14.24/cwt above non preconditioned calves at the same sales. Steer premiums averaged $13.51 across all weights while heifer premiums averaged slightly higher at $15.31/cwt. Premiums reported here are calculated as a weighted average and do not reflect differences attributable to lot size, breed, hide, color, fleshiness, and muscling.

On average, OQBN producers realized a premium of $85.44/head, assuming a 600 pound calf. When the value of added weight gain over the preconditioning period is considered along with preconditioning costs, the net gain in returns to a producer for the average calf is estimated at $114.44/head, bringing the estimated monetary impact of the program to $1.15 million for 2017.

For more information on OQBN, including program information, sale dates, weaning and management protocols, go to the OQBN Website (http://oqbn.okstate.edu/). The website includes additional educational information related to beef calf production in general that you may find useful. You can also like OQBN’s Facebook page and visit Oklahoma State University’s Beef Extension website (http://www.BeefExtension.com) for more information on management recommendations and more.

Find out what’s happening on the Oklahoma Cooperative Extension Calendar at https://calendar.okstate.edu/oces/#/?i=2

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Oklahoma State University, in compliance with Title VI and VII of the Civil Rights Act of 1964, Executive Order 11246 as amended, and Title IX of the Education Amendments of 1972 (Higher Education Act), the Americans with Disabilities Act of 1990, and other federal and state laws and regulations, does not discriminate on the basis of race, color, national origin, genetic information, sex, age, sexual orientation, gender identity, religion, disability, or status as a veteran, in any of its policies, practices or procedures. This provision includes, but is not limited to admissions, employment, financial aid, and educational services. The Director of Equal Opportunity, 408 Whitehurst, OSU, Stillwater, OK 74078-1035; Phone 405-744-5371; email: eeo@okstate.edu has been designated to handle inquiries regarding non-discrimination policies.  Any person who believes that discriminatory practices have been engaged in based on gender may discuss his or her concerns and file informal or formal complaints of possible violations of Title IX with OSU’s Title IX Coordinator 405-744-9154.

Lactating Cows Need More Protein and Energy . . .

As the spring calving season gets underway, we often feel a sense of relief when we get live calves on the ground and our attention then turns to the remaining cows that are yet to calve. However, we shouldn’t lose focus of the nursing cows and their increased dietary needs. Now, it requires protein and energy not only to maintain flesh and core body functions during inclement weather, but also to fuel milk production, and Mother Nature dictates that if a cow’s protein and energy requirements are not adequate to satisfy all these biological demands, she will sacrifice her body mass to provide for the newborn nursing calf. Dr. Glen Selk, Oklahoma State University Emeritus Extension Animal Scientist, offers a concise overview of the nursing cow’s increased protein and energy needs.

Beef cow owners have known for years that body condition at calving time is a critical determinant in the re-breeding performance of the cows during the next breeding season. Another key factor that impacts return to estrus cycles and re-breeding is the maintenance or loss of body condition after calving and before breeding. Cows losing body condition after calving and before the breeding season will be slower to return to heat cycles and rebreed at a lower rate. Therefore it is necessary that the cow manager understand the change in nutrient requirements of beef cows as they change from gestating cows to early lactation cows.

Using an example of a 1200 pound cow in late gestation, one can examine the nutrient increases as she delivers the calf and starts to lactate. Look in the Oklahoma State University Extension Circular E-974 Nutrient Requirements for Beef Cattle. A 1200 pound late gestation cow requires 1.9 pounds of crude protein daily and 12.9 pounds of Total Digestible Nutrients (TDN). She can consume voluntarily 24 pounds of dry matter feed/day. The same cow after calving will weigh at least 100 pounds less (birth weight of calf, placenta, and fluid loss). An 1100 pound cow in early lactation requires 2.9 pounds of protein each day. That is a 52% increase in protein needs. Her energy requirements go up substantially as well.  She needs 16.8 pounds of TDN each day (if she is an average milking beef cow). This represents a 30% increase in energy intake per day.  Her daily dry matter intake also increases from 24 to 29 pounds but this represents only a 20% increase. If the 30% crude protein supplement being consumed is increased by 3.3 pounds, the protein requirement is met and most of the additional energy needs are fulfilled. Her voluntary increase of 2 pounds of hay per day should make up the remaining gap.

As we examine this example it is very clear that the cow will voluntarily consume a small increase in dry matter, however her needs in protein and energy both increase in larger percentages. Therefore an increase in both diet quality and quantity is necessary after calving to insure that body condition is maintained into and through the breeding season.

As a follow-up to Dr. Selk’s comments, I would remind you that cows can suffer some dietary deficiencies and still provide for the calf, but it will be at the expense of her own body condition and, as Dr. Selk points out, that has repercussions for recycling and rebreeding. In other words, the current body condition on nursing cows will have an impact on next year’s calf crop, and remember that reproductive efficiency is the most significant economic measure of a cow/calf operation.

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Oklahoma State University, U.S. Department of Agriculture, State and Local Governments Cooperating. The Oklahoma Cooperative Extension Service offers its programs to all eligible persons regardless of age, race, color, religion, sex, sexual orientation, genetic information, gender identity, national origin, disability or status as a veteran, and is an equal opportunity employer.

Why is Body Condition Important in Cow/Calf Operations? . . .

Well, this year’s calving season is already in the books. At the very least, we are too far along to make any considerable body condition changes in those females that are still to calve. However, it is not too late to begin planning for next year and now is a good time to evaluate the impact of body condition and rebreeding success in the coming weeks. Let’s set the stage for this discussion.

Reproductive efficiency is the single most significant economic metric of a cow/calf enterprise. In layman’s terms, a beef cow’s primary function is to produce a healthy calf, but an efficient beef cow’s primary function is to produce a healthy calf every 365 days. If they are not producing a calf within a 365-day interval, something is amiss and profits are declining. So, what does this have to do with body condition? Answer: everything.

Nature dictates that a cow’s primary job, and therefore her priority for nutrient intake and utilization, is to provide for her calf. If nutrition is limiting, she will undertake this primary task at the expense of her own flesh, pulling energy reserves from stored fat (external and intermuscular fat depositions) to provide milk for the nursing calf. Nature further dictates that if she cannot adequately care for the nursing calf AND maintain her own body condition, she will not be allowed to conceive another calf. Nature says we must take care of the living first, before we can conceive another generation. Mother Nature is a wise old Dame.

Insuring that cows have adequate stored energy reserves (body condition) is the only way that we can give that cow an opportunity to be “efficient”, or to calve every year within that 365-day interval. So, to assess body condition, we have assigned a numerical system (1-9) to differentiate between various degrees of stored fat reserves. Extensive research has proven that there is a strong correlation between these Body Condition Scores and a cow’s ability to return to estrous and conceive in a timely manner. Considering that the gestation period for cattle is 9 months, which means she needs to cycle and rebreed within 60-90 days after calving if she is going to meet the 365-day calving interval. The following graph is a summary of six herds in four states, showing the effect of body condition on rebreeding success.

You can readily see that cows in a body condition score of 6 or higher, immediately prior to calving, rebreed in a timely manner at a rate of 50% greater than those cows in a body condition score of 4 or less. What is the end result? Simply put, it means that, in a 100-cow herd, 50 more cows will calve again within the 365-day interval, and that means more pounds of weaned calf weight to market and older, more developed heifers to select replacements from. To give some visual perspective, below are a couple images representing those two groups of females.

Mature cows should calve in a Body Condition Score of 5 or 6 and, due to their higher nutrient demand, first-calf heifers should calve at a BCS 6. Logically then, evaluating Body Condition Scores, on the spring-calving cows, again this fall at weaning time will give you some time to plan your winter supplement program so as to add some body condition prior to the throes of winter and late-gestation, when it becomes very difficult and expensive to add weight and condition to cows.

Stay tuned next week and we will discuss how a cow’s Body Condition Score also affects the health of her calf.

Find out what’s happening on the Oklahoma Cooperative Extension Calendar at https://calendar.okstate.edu/oces/#/?i=2

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Oklahoma State University, in compliance with Title VI and VII of the Civil Rights Act of 1964, Executive Order 11246 as amended, and Title IX of the Education Amendments of 1972 (Higher Education Act), the Americans with Disabilities Act of 1990, and other federal and state laws and regulations, does not discriminate on the basis of race, color, national origin, genetic information, sex, age, sexual orientation, gender identity, religion, disability, or status as a veteran, in any of its policies, practices or procedures.  This provision includes, but is not limited to admissions, employment, financial aid, and educational services. The Director of Equal Opportunity, 408 Whitehurst, OSU, Stillwater, OK 74078-1035; Phone 405-744-5371; email: eeo@okstate.edu has been designated to handle inquiries regarding non-discrimination policies: Any person (student, faculty, or staff) who believes that discriminatory practices have been engaged in based on gender may discuss his or her concerns and file informal or formal complaints of possible violations of Title IX with OSU’s Title IX Coordinator 405-744-9154

Nutritional Challenges of Post-Partum Beef Cows . . .

 Late winter and early spring is the most challenging time of the year for the nutrition of the spring-calving beef cows. Unless cool season grasses are available, this is a season where maintaining or gaining body condition on spring calving cows is really quite difficult. Warm season grasses have not yet begun to grow. Dormant grass (what little is left) is a low quality feed. Cows cannot, or will not, consume a large amount of standing dormant grass at this time year. If the only supplement being fed is a self-fed, self-limited protein source, the cows may become very deficient in energy. Remember, the instructions that accompany these self-fed supplements. They are to be fed along with free choice access to adequate quality forages. 

There is another factor that compounds the problem. A small amount of winter annual grasses may begin to grow in native pastures. These are the first tastes of green grass many cows have seen since last summer. The cows may try to forage these high moisture, low energy density grasses, in lieu of more energy dense hays or cubes. The sad result is the loss of body condition in early lactation beef cows just before the breeding season is about to begin. 

Body condition at the time of calving is the most important factor affecting rebreeding performance of normally managed beef cows. Nonetheless, condition changes after calving will have more subtle effects on rebreeding especially in cows that are in marginal body condition.  Body condition changes from the time the cow calves until she begins the breeding season can play a significant role in the rebreeding success story. This appears to be most important to those cows that calve in the marginal body condition score range of “4” or “5”. 

An Oklahoma trial (Wettemann, et al., 1987 Journal of Animal Sci., Suppl. 1:63). illustrates the vulnerability of cows that calve in the body condition score of 5. Two groups of cows began the winter feeding period in similar body condition and calved in very similar body condition (average body condition score = 5.3 to 5.4). However, after calving and before the breeding season began, one group was allowed to lose almost one full condition score. The other group of cows was fed adequately to maintain the body condition that they had prior to calving. The difference in rebreeding rate was dramatic (73% vs 94%). Again this illustrates that cows that calve in the body condition score of 5 are very vulnerable to weather and suckling intensity stresses and ranchers must use good nutritional strategies after calving to avoid disastrous rebreeding performance.

Cows should calve in moderate to good condition (scores of 5 or 6) to ensure good rebreeding efficiency. Ideally, cows should be maintaining condition during mid to late pregnancy and gaining during breeding. The goal of the management program should be to achieve these body conditions by making maximum use of the available forage resource. 

Continue feeding a source of energy, such as moderate to good quality grass hay free choice and/or high energy cubes until the warm season grasses grow enough to provide both the energy and protein that the lactating cows need. Yes, the feed is high-priced. But the cost of losing 21% of next year’s calf crop is even greater! Source:  Glen Selk, Oklahoma State University Emeritus Extension Animal Scientist; March 5 Cow/Calf Corner Newsletter.

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