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Agricultural News


Culling Open Heifers After First Breeding Season Can be Economically Advantageous for Producers

Tue, 15 Aug 2017 09:47:00 CDT

Culling Open Heifers After First Breeding Season Can be Economically Advantageous for Producers Dr. Glenn Selk, Oklahoma State University Emeritus Extension Animal Scientist, offers herd health advice as part of the weekly series known as the "Cow Calf Corner" published electronically by Dr. Peel and Dr. Glenn Selk. Today, Dr. Selk advises producers on the economic advantages behind culling open replacement heifers after their first breeding season.


"Many Oklahoma ranchers choose to breed the replacement heifers about a month ahead of the mature cows in the herd. In addition, they like to use a shortened 30 to 60-day breeding season for the replacement heifers. The next logical step is to determine which of these heifers failed to conceive in their first breeding season. This is more important today than ever before.



"The bulls were removed from the replacement heifers about 60 days ago, therefore, this would be an ideal time to call and make arrangements with your local large animal veterinarian to have those heifers evaluated for pregnancy.   After two months of gestation, experienced palpaters should have no difficulty identifying which heifers are pregnant and which heifers are not pregnant (open). Those heifers that are determined to be "open" after this breeding season, should be strong candidates for culling. Culling these heifers immediately after pregnancy checking serves three very economically valuable purposes.



"1) Identifying and culling open heifers early will remove sub-fertile females from the herd.   Lifetime cow studies from Montana indicated that properly developed heifers that were exposed to fertile bulls, but DID NOT become pregnant were often sub-fertile compared to the heifers that did conceive. In fact, when the heifers that failed to breed in the first breeding season were followed throughout their lifetimes, they averaged a 55% yearly calf crop. Despite the fact that reproduction is not a highly heritable trait, it also makes sense to remove this genetic material from the herd so as to not proliferate females that are difficult to get bred.


"2) Culling open heifers early will reduce summer forage and winter costs. If the rancher waits until next spring to find out which heifers do not calve, the pasture use and winter feed expense will still be lost and there will be no calf to eventually help pay the bills. This is money that can better be spent in properly feeding cows that are pregnant and will be producing a salable product the following fall.


"3) Identifying the open heifers shortly after (60 days) the breeding season is over will allow for marketing the heifers while still young enough to go to a feedlot and be fed for the choice beef market. "B" maturity carcasses (those estimated to be 30 months of age or older) are very unlikely to be graded Choice and cannot be graded Select.   In addition, they may not be eligible for some international beef markets. As a result, the heifers that are close to two years of age will suffer a price discount. If we wait until next spring to identify which two year-olds did not get bred, then we will be culling a female that will be marketed at a noticeable discount compared to the price/pound that she would have brought this summer as a much younger animal.   In today’s market an 850 pound non-pregnant heifer will bring about $1.30/lb. or $1105 per head. If current prices hold, next spring a two-year old 1000 pound open cow may bring $0.90/lb. or $900 per head. This calculates to a $205 per head loss plus the expense of keeping her through the winter.



"Certainly the percentage of open heifers will vary from ranch to ranch. Do not be overly concerned, if after a good heifer development program and adequate breeding season, that you find that 10% of the heifers still are not bred. Resist the temptation to keep these open heifers and “roll them over” to a fall-calving herd. These are the very heifers that you want to identify early and remove from the herd. It just makes good economic business sense to identify and cull non-pregnant replacement heifers as soon as possible."





   

 

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