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Genetic Selection Basics for Beef Cattle

Genetic selection is how you decide which animals become parents. Done with a clear goal and good records, it improves the herd a little each year without adding much cost.

Start with your goal, not the catalog

Before you look at a single bull sale catalog, write down what you want your calves and cows to do. A commercial cow-calf operation selling weaned calves has different needs than a producer who retains ownership through finishing or sells breeding stock.

Think about your environment too. Forage, heat, winter, labor and market all shape which traits matter. A cow that thrives on lush pasture may struggle on dry range.

Put the answers on one page and keep it where you keep your breeding records. When you read a catalog next fall, the page keeps you honest about what you set out to do.

• What do you sell: weaned calves, yearlings, finished cattle or breeding stock?
• What does your forage base support?
• How much labor do you have at calving?
• What do your buyers reward?

Traits that matter most in practice

Most producers group traits into a few families: reproduction, growth, maternal performance and carcass merit. Reproduction comes first because a cow that does not calve every year does not pay her way. Fertility, calving ease and cow longevity are worth more attention than they usually get.

Growth and carcass traits are easier to see and measure, which is why they get chased. Pushing one trait hard often pulls another the wrong way, so balance is the aim. Remember that traits interact, so a gain in one place often shows up as a cost somewhere else.

Use records you actually keep

Selection depends on data. Birth dates, calving ease, weaning weights and cow outcomes all help you see which cows and bulls contribute. The 205-day adjusted weaning weight and 365-day yearling weight are standard record terms that let you compare calves born on different days.

Even a simple notebook or spreadsheet helps. Track which cows calved on time, which needed help and which weaned a good calf. Over a few years the pattern of who stays and who goes becomes clear.

Selection tools you can use

Visual appraisal still has a role, especially for structure, feet, udder quality and temperament. It works best alongside numbers. Expected progeny differences, or EPDs, give a prediction of how a sire's calves are likely to perform relative to other sires within the same breed.

Genomic testing can add information, particularly on young animals with little data. Ask your breed association how it incorporates test results into its evaluations.

Keeping the right females

Female selection is half the program and often the cheapest half. A cow that calves every year, raises a good calf and stays sound deserves to stay. A cow that misses a calf, has trouble at calving or has poor feet or udder is costing you.

Cull on performance and soundness rather than on mood or habit. When you keep heifer calves, favor those from productive, easy-fleshing cows that were born early in the calving season.

Avoid single-trait selection

It is tempting to chase the highest number on one trait. A bull with extreme growth may bring larger calves, bigger mature cows and higher feed needs. Extremes on any side carry costs.

Pick a target range for each trait that fits your system, then choose bulls inside that range. Ask the seedstock producer how the bull's family has performed in herds like yours.

Selection works through generations. A single bull battery will not transform a herd, but consistent choices over five or ten calf crops will. Heifers kept from your best cows carry half the genetics of the next bull, so decisions about which heifers to keep matter as much as bull purchases.

Common mistakes and what to ask a seller

Buying on looks alone, buying the cheapest bull and keeping no records are the usual mistakes. Another is changing direction every year, so the herd never settles.

When you shop, ask the seller for performance data, health and fertility testing information, and what the bull's daughters have done in working herds.

• Does he fit my calving ease needs?
• Are his numbers inside my target ranges?
• Has he passed a breeding soundness exam?
• How have his daughters performed?

More in Breeding, Genetics & Reproduction

• Expected Progeny Differences Explained
• Using EPDs in Commercial Herds
• Selecting Heifers for Replacement
• Replacement Heifer Development
• Age at First Calving Targets
• Heifer Breeding Weight and Condition