9 March 2012

3 minute read

North America

Cow-calf producers can take advantage of high market prices by selecting healthy bulls that will produce calves with more growth potential.

"If we can buy bulls that will produce offspring that will be born with a minimum of dystocia, grow a little bit faster, will produce a little bit higher-quality carcase and produce replacement females that perform above average, I think our cow-calf producers have the opportunity to capitalize," Ron Lemenager said.

Producers can do this by looking at what will affect offspring and doing plenty of research before investing.

"Good bulls come from good cows," Mr Lemenager said. "So if producers can take a look at mom before they purchase that bull, I think it helps minimise some of the risk."

But even if the dam looks good and is healthy, a bull's own merit still needs to be evaluated, starting with reproductive soundness. They should have a breeding soundness evaluation that includes both a physical exam and semen quality evaluation. Many seedstock operations offer a breeding guarantee to the buyer.

Mr Lemenager also said it's important to know the animal's health status.

"Know the background of the bull and the vaccination history," he said. "If you're buying an older bull, be sure the animal doesn't have any venereal diseases that are going to come back into the herd. I really like the idea of buying a virgin bull to minimise the risk."

Structural soundness plays a large role in whether a bull will be able to get cows bred, so Lemenager suggested inspecting feet and leg structure, eyes and muscle shape, a factor that contributes to calving ease.

Also important is genetic merit. Genetic defects have the potential to cause problems in the herd.

"Almost every breed has one or more genetic defect, and they can sneak up on you if you're not careful," Mr Lemenager said. "Producers need to study the pedigrees and know which bulls are free of genetic defects, or buy bulls that have been DNA tested and declared free of known defects."

Producers also need to study up on a bull's expected progeny differences, or EPDs. Calving ease, maternal calving ease, growth traits, maternal milk and carcass traits can all affect a producer's bottom line.

"We really need to keep an eye on the EPDs for the economically important traits," Mr Lemenager said. "We need to stay away from single trait selection and emphasise multi-trait selection to make herd improvement that complements marketing strategy. If you're saving back replacement heifers, things like maternal calving ease and maternal milk become very important.

"Growth traits such as weaning and yearling weight affect the pounds available for sale. Carcase traits, such as marbling, backfat and the ribeye area are the main drivers for how these cattle hang on the rail.

"I'd also do an independent cull on frame size, so the cattle don't get to be too big or too little."

It's not until all of these traits have been met that Mr Lemenager recommends producers start looking at the animal's phenotype, or "look."

Much of this same advice applies to producers who manage an artificial insemination breeding program. And while commercial AI studs tend to do a good job of screening animal health, AI sires can still perform differently.

"Some bulls produce semen that's of higher quality or that gets cows bred better than other bulls," Mr Lemenager said. "So, here again, producers need to do their homework before they start spending a lot of money on semen. They need to know that the bull has been working, that cows have been conceiving to that semen and that the offspring are performing as expected."