RIGOROUS CULLING HELPS MAINTAIN EFFICIENT HERD

by: Michelle Arnold, DVM
University of Kentucky


Which cows in your herd are making you money and who is losing you money? Every year, the cow-calf producer needs to critically evaluate each animal in the herd and decide if she is paying her upkeep. Open cows (those that are not pregnant) at the end of breeding season obviously are the top of the cull list. With variable costs running $400-$500 per year per head and an additional $ 100-$300 in fixed costs, keeping open cows is a financial black hole. Beyond pregnancy status, what other variables are important to evaluate? Structural soundness, body condition score, age, performance, and disposition are vital components in developing a culling order specifically for your farm. This culling order is exceptionally important during times of drought or a year with marginal hay production as you may have to cull deeper to manage through a difficult season. To begin, it is best to think about who in the herd has the least chance of being productive in the long term or is farthest away from being productive. Equally important are factors such as disposition and phenotype that affect the marketability of offspring. The following is a list of factors to consider when deciding who to cull this year.

Example of a Culling Order:
1. Mean Disposition
2. Open Females
3. Structurally Unsound / Chronic Condition
4. Age
5. Poor Performance-Records
6. Phenotype-color, stature
7. Replacement Heifers
8. Bred cows over 9 years of age
9. Bred Cows 3-9 years of age

Disposition -- A cow's attitude is an important consideration in any cattle operation. Bad behavior has both a genetic component and is also learned by calves at an early age. Mean cattle are dangerous to people, damage facilities, tear up fences and make gathering and working cattle a nightmare. Remember a good cow can be protective without being dangerous and destructive.

Pregnancy Status -- A cow should produce a calf at least once a year and the sale of that calf needs to pay her way. Diagnosing a cow as “open” (not pregnant) is as simple as veterinarian palpating for pregnancy at least 40 days after breeding or removing the bull. A simple, inexpensive blood test can also be used 28 days post-breeding to determine pregnancy status. If many cows are found open at pregnancy check, work with your veterinarian to determine if reproductive disease, poor nutrition, bull infertility or inability was the cause. Remember that cows that calve late in the season have less opportunity to breed back in a controlled (for example, 90 day) breeding season. Summer heat and fescue toxicosis can be important contributors to low conception rates.

Structural Soundness -- Bad hooves or claws, lameness due to hip/knee injury, eye problems, and poor udder conformation are all examples of structural problems that adversely affect performance. Good feet and legs are essential for weight maintenance, breeding, calving, self-defense, and raising a calf.

The udder should be firmly attached with a level floor and high enough that newborn calves can easily find and latch onto teats. Cows with blind or light quarters, funnel or balloon shaped teats, or any history of mastitis are strong candidates for culling.

Cows with chronic conditions that will not improve such as progressive weight loss, early cases of cancer eye, repeated episodes of vaginal prolapsed during pregnancy, and extreme sensitivity to the effects of fescue toxicosis should be removed from the herd as soon as the calf is weaned. Cows with confirmed disease conditions such as Johnes disease, bovine lymphoma, or advanced cancer eye should not be returned to a commercial market. The most common reasons for carcass condemnation at slaughter include emaciation, lymphoma, peritonitis, cancer eye, blood poisoning, bruising, and other cancers.

Age -- Cows are considered most productive between 4-9 years of age. Look at the teeth to assess the age but evaluate them in light of diet-cows that eat gritty or sandy feeds and forages have increased tooth wear beyond their years. Cows with badly worn or missing teeth will have a hard time maintaining body condition. Older cattle die of natural causes, too.

Poor Performance -- Record keeping is an invaluable tool for evaluating performance. Readable visual tags on both the cow and calf allow you to match calf sale weights to the dams and identification of cows that did not produce a calf. Inferior genetics and poor milk production produce lightweight calves that do not grow well. An overweight cow or large framed cow with a small calf that doesn't gain weight usually means the cow is not producing much milk. Sick baby calves may be an indication of poor quality colostrum and poor mothering ability.

Phenotype -- These are cows that do not “fit” the herd because of external features such as unusual breed, size, muscling and color. These challenges may be overcome to some degree by choice of sire to balance out the unwanted traits. Remember that buyers of commercial calves look for uniformity in color, weight, and frame in a set of calves.

The last ones to go – Hopefully culling will never have to go this deep in your herd. Bred cows over nine years old, replacement heifers (especially those that did not breed in the first 30 days), and bred three to nine years old should be the last sold. Thin cows that conceive late in the breeding season should go first.

Since 20 percent of gross receipts in a typical cow-calf operation come from the sale of cull animals, pay attention to price seasonality and body condition score before sending these animals to market. Prices are highest in spring and lowest in late fall/early winter when spring born calves are weaned and culls sent to market. Adding weight and body condition to culls is an opportunity to increase profitability but can be expensive. Work with a nutritionist to come up with realistic cost projections before feeding cull cattle for a long period of time.

When it comes to making decisions on who to cull, remember to consider functionality in your environment. Is she an “easy keeper”? Does she keep flesh and condition 'and raise a good calf, even when feed and forage is limited? On the opposite side, does she give too much milk or is her frame size so large that you can't keep weight on her, even when pasture is plentiful? Is her pelvis so small and tight that calving is a problem and will be a problem in her offspring?

Functionality leads to longevity and improved efficiency. By retaining more young cows in the herd, you can decrease the number of replacement heifers needed and cull cows that are only marginally profitable. Young cows also increase in value as they mature because the body weight of the cow and her calf's weaning weight will continue to increase from two to five years of age. Longevity may also be improved through crossbreeding because hybrid vigor adds essentially 1.3 years of productivity or one more calf per cow.

Cull Cow Language

Breakers (75-80% lean) -- Highest conditioned cull cows (BCS greater than or equal to 7), excellent dressing percentages

Boners or "boning utility" (80-85% lean) -- Moderately conditioned (BCS 5-7), well-nourished commercial beef cows (usually highest price cull)

Leans (85-90%)- Lower BCS (1-4), lower dressing percentages, susceptible to bruising during transport and expect more trim loss. Moving cows from lean to boner status can usually be done efficiently

Summary

A herd of easy-keeping, efficient cows is possible through rigorous culling and careful selection of replacements. Match your genetics to your management and environment for maximum efficiency, longevity, and ultimately, maximum enjoyment of cattle production.







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