Start heifer selection when calves hit the ground

A Handbook for Ranch ManagersBy Helen Mcmenamin via Canadian Cattlemen

She will look a lot like her mom in a couple of years so this is a good time to think about whether that’s what you want. Photo: Erika Strande

You’ve got more than enough to do at calving time, but a little thought and a few notes now could be a great investment in your herd’s future. Do that and a Nebraska researcher figures you will have most of the information you need in your calving notes to choose the heifers you want to breed.Planned Grazing: A Study Guide and Reference Manual

Rick Funston, of the Gudmundsen Sandhills Laboratory of the University of Nebraska, Lincoln, says the best way to find heifers that grow into cows that deliver a decent calf and stay in the herd year after year is to choose from calves born early in the calving season.

Environmental & Natural Resource Economics: The Austrian ViewDon’t include heifers born to mothers with problems, but expose the rest to a 30- to 45-day breeding period to pick out the most fertile heifers as your replacements. If that’s more than you need, sell some as bred heifers.

Funston bases his advice on work at the U.S. Meat Animal Research Center (MARC) showing heifers calving early in their first calving season have increased longevity and wean more pounds of calf, compared to those delivering their first calf later in the season.The Betrayed: On Warriors, Cowboys and Other Misfits    Combat Shooter's Handbook

In his own research, Funston tracked over 1,100 heifers born from 1997 to 2009 from birth to second pregnancy and found a big advantage to those born in the first 21 days.

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The number pregnant after weaning their first calf wasn’t significantly different from cows born in the third 21-days cycle, 93 per cent compared to 84 per cent, but it was higher. Choosing those older heifers is selecting for fertility, he says.

Not only were those heifers more fertile, they had lower birth weights, but being a few weeks older than calves born in the following 42 days, they had higher weaning weights. They maintained their weight advantage over younger animals into their first pregnancy even though later-born animals had slightly higher rates of gain.

Funston advises eliminating daughters of cows that need help calving, those with big teats that you have to help nurse and those with attitude problems. All these things really show up around calving time, and should be in your notes. Sometimes by weaning time a calf looks so good her mother’s flaws don’t seem so bad. But, that calf may well look a lot like her mother a couple of years from now. Calving is the time to think about whether that’s what you want.

The Edmonton-based, Delta Genomics, Igenity’s Canadian testing partner, is working to identify superior replacement heifers from DNA. They use fertility, longevity and feed efficiency markers as guides to maternal functions. It’s still early in their verification process, but they can give a score of 1 to 10 for each of those traits that allows you to rank animals in your herd.

“We don’t have the confidence and accuracy we’d like in our replacement female tests yet,” says Delta CEO, Colin Coros. “We need 2,000 or 3,000 animals to show our tests work, but ideally we’d like to validate them on 10,000 animals. We work by ranking a population, so the more animals the better. We’ve worked a lot with Angus cattle and our testing for them is quite accurate. Now we’re working on other cattle populations.

“Longevity, which is so important for replacements in cow-calf herds is very complex — so many traits are involved.”

DNA testing works by correlating records of an animal’s performance with the chemical reactions when a sample of its DNA is added to a number of specific DNA pieces or “snips,” each containing a known marker, Coros explains. At present, testing replacement heifer traits requires a panel of 50,000 snips. As more and more cattle are tested Coros expects they will be able to identify the most important markers so they can use fewer DNA snips but achieve greater accuracy and bring down the cost of testing from its present $25 per sample. Accuracy is better within breeds than in crossbreds and testing in very different environments can be more challenging, he says.

Eventually, Coros expects DNA results will be used like EPD values today to rank animals within a population.

“There is value to testing now,” he says. “The tests definitely allow you to rank animals for each trait. That should have some value in choosing among animals. But, the real value of this technology is that you can make decisions earlier in an animal’s life. And, other tests for negative traits in a population can eliminate some animals you don’t want to keep.”

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A Handbook for Ranch ManagersA Handbook for Ranch Managers.  In keeping with the “holistic” idea that the land, the livestock, the people and the money should be viewed as a single integrated whole: Part I deals with the management of the natural resources. Part II covers livestock production and Part III deals with the people and the money. Not only would this book make an excellent basic text for a university program in Ranch Management, no professional ranch manager’s reference bookshelf should be without it. It is a comprehensive reference manual for managing the working ranch. The information in the appendices and extensive bibliography alone is worth the price of the book.

You might be interested in this books supplement: Planned Grazing: A Study Guide and Reference Manual.

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Land and Livestock International, Inc. is a leading agribusiness management firm providing a complete line of services to the range livestock industry. We believe that private property is the foundation of America. Private property and free markets go hand in hand—without property there is no freedom. We also believe that free markets, not government intervention, hold the key to natural resource conservation and environmental preservation. No government bureaucrat can (or will) understand and treat the land with as much respect as its owner. The bureaucrat simply does not have the same motives as does the owner of a capital interest in the property. Our specialty is the working livestock ranch simply because there are so many very good reasons for owning such a property. We provide educational, management and consulting services with a focus on ecologically and financially sustainable land management that will enhance natural processes (water and mineral cycles, energy flow and community dynamics) while enhancing profits and steadily building wealth.
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2 Responses to Start heifer selection when calves hit the ground

  1. p says:

    Doesn’t matter how big your operation is, that notebook in your pocket is a real aid to “remembering” those details that may make a difference generations down the line.

    Like

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