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Agricultural News

Glenn Selk Explains How Culling Cows Can Help Producers Maintain a Healthy Herd and Business

Tue, 10 Oct 2017 10:26:59 CDT

Glenn Selk Explains How Culling Cows Can Help Producers Maintain a Healthy Herd and Business 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 explains why proper cow culling is so important to producers' businesses.

"Cull cows represent approximately 20% of the gross income of any commercial cow operation. Cull beef cows represent 10% of the beef that is consumed in the United States. The most recent "Market Cow and Bull Audit" has shown that the beef industry has made significant improvements in proper cow culling over the past 20 years. Nonetheless, Oklahoma ranchers need to make certain that cow culling continues to be done properly and profitably. Selling cull cows when they will return the most income to the rancher requires knowledge about cull cow health and body condition. Proper cow culling will reduce the chance that a cow carcass is condemned at the packing plant and becomes a money drain for the entire beef industry.

"Is she good for another year? At cow culling time, producers often face some tough decisions. Optimum culling of the herd seems to require a sharp crystal ball that could see into the future. Will she keep enough body condition through the winter to rebreed next year? How old is the cow? Is her mouth sound so that she can harvest forage and be nutritionally strong enough to reproduce and raise a big calf? At what age do cows usually start to become less productive?

"There is great variability in the longevity of beef cows. Records kept by a large cattle operation of Florida in the 1980's show how productivity changes over the life of the beef cows. These large data sets, (19500 cows, and 14000 cows in two separate years) compared the average percentage of cows determined to be pregnant based on their age in years. (Source: 33rd Annual Proceedings of the Beef Cattle Short Course by the University of Florida Animal Science Department).

"This data would indicate that cows are consistent in the rebreeding performance through about 8 years of age. A small decline was noted as cows aged from 8 to 10 years of age. However the most consistent decline in reproductive performance was noted after cows were 10 years of age. A steeper decline in reproductive performance was found as they became 12 years of age. In other words, start to watch for reasons to cull a cow at about age 8. By the time she is 10, look at her very closely and consider culling; as she reaches her 12th year, plan to cull her before she gets health problems or in very poor body condition."



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