Replacement Heifer Selection at Weaning

The heifers you keep at weaning become the cow herd five or ten years from now. A careful look today, backed by records, pays off every calving season afterward.

Key points

Judge heifers by the performance of their dams, not just size.
Compare weights within the same contemporary group.
Evaluate structure and temperament along with records.
Keep a few extra heifers and cut with clear criteria later.
Make a development and health plan with your vet and nutritionist.

Start with the dam, not the calf

A heifer inherits half her genetics from a cow whose record you already know. Look first at the dams. Did she calve unassisted every year, raise a good calf, breed back on time and stay sound? A heifer from a cow that checks all those boxes starts ahead of one from a cow that does not.

Be honest about cows that needed help, were slow to breed back or had trouble with udders or feet. Those traits are often worth avoiding in daughters. Pull your calving and breeding records before you walk into the pen.

If a heifer's dam is unknown, for example a purchased calf, you have less to go on and should lean harder on structure, temperament and later reproductive evaluation.

Calved every year without assistance
Raised a calf with a good weaning weight for her age
Bred back early in the season
Sound feet, legs and udder
Calm, workable temperament

Use growth records and EPDs wisely

Weaning weight, adjusted to the standard 205-day measure, helps you compare heifers raised under the same conditions. Compare within contemporary groups, meaning calves born and managed alike. A heifer that looks big because she is the oldest in the group may not truly be the best.

If the sire and dam have EPDs, look at the traits that fit your goals, such as maternal traits, calving ease and growth. Beef Improvement Federation guidelines and your breed association can help you read them. Avoid picking on a single trait.

Look at the whole animal

Structure matters for longevity. Walk the pen and look at legs, feet, shoulders, back and general balance. Check that heifers show enough femininity and capacity for a good mother cow. Watch for crooked legs, weak pasterns or other defects that could cause trouble later.

Temperament counts too. A heifer that is flighty or aggressive at weaning tends to be harder on people and facilities. Safe handling is a big part of ranch life, and a dangerous cow is a bad bargain.

Keep extras and decide later

Many ranchers keep more heifers at weaning than they plan to breed, then make cuts after more information comes in, such as yearling weight, structural changes and reproductive evaluation before breeding. The 365-day yearling weight is a standard record for this.

Holding extras costs feed, labor and pasture, so think through the cost with your accountant or lender. Do not keep heifers out of sentiment. Decide your target number up front and cut to it with clear criteria.

Also think about when each heifer was born. Heifers born early in the calving season have had more time to grow and usually reach breeding readiness sooner, which is one more reason to keep calving dates in your records.

Health and preparation

Ask your vet about a heifer health and vaccination plan well before breeding, including reproductive evaluation. Follow every label and keep treatment records. Treated animals must meet the label or veterinary withdrawal time before any meat is sold, so keep clear notes.

Heifers also need a development plan from a nutritionist or extension agent so they reach breeding in good condition. Score body condition on the 1-to-9 scale and write down the scores.

A simple scoring sheet

Put your decisions on paper so you are not relying on memory when the pen is full of look-alike heifers. Make a sheet with a row for each heifer and columns for dam record, weaning weight relative to her group, structure, temperament and any concerns. Score each column in a way your crew understands, then talk through the close calls together.

Walk the pen more than once, on different days if you can. A heifer that looks fine in the first pass may show a fault when she moves, and one that was nervous at first may settle. Keep the sheet with your permanent records so you can look back later and see whether your picks turned into good cows.

Dam record and age
Weaning weight against her contemporary group
Feet, legs and general structure
Disposition at the chute and in the pen
Notes on anything your vet flagged

Common mistakes and what to ask

Common mistakes include keeping heifers only by size, ignoring dam records, keeping every heifer from a favorite cow and underfeeding the replacements after weaning. Another is skipping the vet's input on reproductive soundness.

Ask your vet which exams make sense before breeding. Ask your breed association how to use its EPDs. Ask your extension office for a heifer development target that fits your forage and cow type.

When to get help: Ask your veterinarian about pre-breeding reproductive evaluation and your extension specialist or breed association about heifer development targets for your herd.

Sources and further reading

Organization homepages are linked so you can search them for current guidance on this topic.

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