Selecting for Calving Ease

Calving difficulty costs calves, cows and sleep. Picking sires and managing heifers with calving ease in mind is the most dependable way to cut down on pulls and losses.

Key points

Calving ease depends on calf size, pelvic size, position and cow condition.
Read calving ease direct, birth weight and calving ease maternal together.
Do not trade away all growth for the lowest birth weight.
Use proven, accurate bulls on heifers and keep notes on each assist.
Compare EPDs only within a breed.

What calving ease means

Calving ease is how easily a calf is born without human help. It depends on the size of the calf, the shape and size of the dam's pelvis, how the calf is positioned and the dam's condition. No single number captures all of it.

Heifers are the highest risk group because they are still growing and have smaller pelvic openings. A bull that suits mature cows can be a poor match for first-calf heifers.

Reading the EPDs

Breed associations publish expected progeny differences, or EPDs, that predict how a bull's calves will compare with those of other bulls in the same breed. For calving, two figures matter most: birth weight and calving ease direct. A third, calving ease maternal, tells you how a bull's daughters will calve.

Calving ease direct predicts how easily his own calves are born, often shown as a percentage of unassisted births. Higher is easier. Maternal figures are used when you keep daughters. Compare bulls only within the same breed and the same evaluation, since each association has its own base.

Calving ease direct: how easily his calves are born
Birth weight EPD: predicted size of his calves at birth
Calving ease maternal: how his daughters will calve
Accuracy value: how much data stands behind the numbers

Why not just pick the lowest birth weight

Low birth weight helps, but chasing it alone can hurt you. Very light calves may grow slowly and bring down weaning weights. The sensible approach is to look at calving ease EPDs together with growth, then choose a bull whose package suits your market.

Accuracy matters too. A young bull with little progeny data can move a lot as his calves arrive. A proven sire with high accuracy is a safer choice for heifers.

Matching bulls to your cows and heifers

Use the easiest calving bulls on first-calf heifers, and keep a separate group of bulls for mature cows if you want more growth. Do not turn heifer bulls out with the main herd by accident.

The calving difficulty you see on your own place is the best test. Keep notes on every assisted birth and the sire involved.

Use a separate, proven calving ease bull on heifers
Breed heifers to calve ahead of the mature cows so you can watch them closely
Check that dams have adequate condition before calving
Record assistance level for each birth

Heifer development and pelvic measurements

Many ranchers measure pelvic area on yearling heifers and cull the smallest. Your veterinarian can explain what the measurement does and does not predict. Pelvic size is one factor and it does not guarantee an easy birth.

Feed matters just as much. Overfat heifers and underfed heifers both calve poorly. Work with a nutritionist or extension specialist on a development plan that gets heifers to a suitable weight and condition by breeding.

Cow condition and the calving season setup

Calving ease is partly about the sire and partly about how you set up the season. Cows and heifers that calve in good condition, on clean ground, near help, have fewer problems and better recovery. Thin females tire sooner during labor and rebreed later.

Watch heifers closely and know your own threshold for stepping in. Write down a calving plan with your vet before the season begins, including who to call and what supplies you need on hand.

A cow protecting a newborn can be dangerous even when she is gentle the rest of the year. Plan how you will approach, where you will stand, and how you will get out. Never work alone in a pen with a fresh cow if you can avoid it. Follow equipment manufacturer instructions for any calf puller or restraint, and follow extension and OSHA guidance for handling livestock safely.

Keep heifers close to the barn or a pasture you can see
Check at regular intervals through the night during the peak of calving
Have clean, working equipment and a restraint that is safe for people and cattle
Post the vet's number where everyone can see it

Common mistakes and what to ask

Frequent errors include comparing EPDs across breeds, choosing a bull from a photo and a price, and turning a bull in with heifers because he is already there. Another is waiting too long to call for help at a difficult birth.

Questions for the seller: What are the calving ease and birth weight EPDs, and how accurate are they? Have his calves been used on heifers in a herd like mine? Ask your vet to walk you through when to assist a birth and when to call, and keep their number posted where you calve.

When to get help: Call your veterinarian early if a cow or heifer shows no progress at birth or you are unsure of the calf's position. Ask your breed association, extension office or a nutritionist for help with heifer development and bull choice.

Sources and further reading

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

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