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Rangeland Researchers Say Smaller is Better

By   /  August 12, 2019  /  1 Comment

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This article comes to us from Oregon State University Extension and Chris Branam.

Ranchers running beef cattle on dry and dusty landscapes should consider smaller cows to get the best out of their herd.

Running cattle on a ranch in sagebrush habitat. Oregon State University photo.

 

That’s the recommendation of a recent interdisciplinary study involving rangeland researchers in Oregon, Wyoming and Oklahoma. Breeding smaller cattle could be a long-term strategy that will help ranchers and ease pressure on an increasingly drought-prone range, said Leticia Henderson, a livestock and range Extension agent at Oregon State University.

The research team developed a statistical model that showed smaller cows have distinct advantages over larger ones in pastures where the cows don’t have much to chew on.

The study is published in the journal Rangelands: Drought Mitigation for Grazing Operations: Matching the Animal to the Environment. It is meant to help cattle producers develop long-term strategies on cattle selection and natural resource management for areas in the United States that are expected to experience more frequent and severe droughts. Cattle ranchers have coped with drought by reducing the size of their herds or increasing their feed, but these methods are costly and don’t solve the problem in the long run, Henderson said

If the total herd size is larger – 100 head weighing 1,000 pounds vs. 78 head weighing 1,400 pounds – feed costs will be lower. Also, with all things being equal in a pasture with little to graze, a smaller cow can produce milk more quickly because it doesn’t expend as much energy to maintain its body size.

“The perceived benefit of larger cows is that they will be able to produce larger calves,” Henderson said. “But the smallest cow size in our model was the most efficient at weaning. That’s based on a previous study by our group that found larger cows in nutrient-limited rangelands don’t always wean larger calves.”

Grazed forage remains the least expensive source of nutrients to maintain the cow herd, Henderson said, so matching cow size and milk production potential to forage resources should help mitigate the effects of rangeland drought on the herd.

The researchers assumed cows in limited-nutrient environments would eat 2.2 percent of their body weight daily over a 210-day weaning period. An ideal weaned calf should weigh about half as much as its mother, “so the likelihood of a 1,400-pound cow weaning a 700-pound calf on rangeland is highly unlikely in 210 days,” Henderson said.

Cattle producers have been changing the size and shape of their cattle for a couple of centuries, going from big to small back to big and then to small again. This three-part series shows you what we’ve done over the years and the extremes we’ve gone to – like little Paulinemere here, the Grand Champion Angus Female in Fort Worth in 1955. Click to start the series.

Recent studies suggest the ideal cow weighs between 1,000 and 1,200 pounds on land where grazing opportunities are scarce – yet the U.S. Department of Agriculture has determined that the average domestic cow size is nearly 1,400 pounds. The model developed by the researchers used cow sizes ranging from 1,000 pounds to 1,400 pounds.

The increase in the average cow size is the result of a steady trend in selective breeding over the last few decades, and the researchers don’t expect herds of smaller cows in the next few years. They want their model to be considered by cattle ranchers over the long haul, she said.

“This isn’t a short-term solution,” she said. “It took a long time to breed 1,400-pound cows. We’re not going to get down to 1,100-pound cows overnight, either.”

The U.S. Department of Agriculture National Institute of Food and Agriculture funded the research. Derek Scasta, extension rangeland specialist at the University of Wyoming, led the study.

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  • Published: 1 month ago on August 12, 2019
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  • Last Modified: August 9, 2019 @ 2:02 pm
  • Filed Under: Livestock

About the author

Publisher, Editor and Author

Kathy worked with the Bureau of Land Management for 12 years before founding Livestock for Landscapes in 2004. Her twelve years at the agency allowed her to pursue her goal of helping communities find ways to live profitably AND sustainably in their environment. She has been researching and working with livestock as a land management tool for over a decade. When she's not helping farmers, ranchers and land managers on-site, she writes articles, and books, and edits videos to help others turn their livestock into landscape managers.

1 Comment

  1. Richard Moyer says:

    Like my Red Devons. Already at the 1000-1100 lb range.

    https://onpasture.com/2018/04/23/why-red-devon/

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