Brahman-type cattle may require less dietary nitrogen

Texas A&M AgriLife study to identify differences in nitrogen metabolism between primary cattle subspecies.

July 31, 2020

3 Min Read
Texas AgriLife Braham cattle nutrition 5E8A1685_edited.jpg
Graduate students Merritt Drewery and Kyle Weldon collect duodenal samples from a Brahman steer.Texas A&M AgriLife photo

A recently funded Texas A&M AgriLife study will determine differences in nitrogen requirements between Brahman-type cattle and other cattle. According to the announcement, measuring these differences may allow cattle producers to reduce the protein in cattle diets by allowing for precise diet formulations.

“Implementation of precision diet formulation in cattle diets can be the answer to producing a more affordable beef with a smaller environmental impact,” said Dr. Tryon Wickersham, Texas A&M AgriLife Research scientist and associate professor in the Texas A&M College of Agriculture & Life Sciences' department of animal science.

“We believe development of feeding systems that account for differences in cattle type will reduce over- and under-supplementation, allowing us to optimize growth, reproduction and animal health outcomes,” Wickersham said. “Additionally, precise feeding systems will reduce the environmental footprint of beef production.”

Cattle are divided into two subspecies: Bos taurus taurus, which generally have no hump and originated from Europe, and Bos taurus indicus, which generally have a hump and originated in India.

“These cattle were selected under very different conditions and have developed the capacity to thrive under different conditions,” Wickersham said. “These adaptations affect the way they perform and have not been well accounted for in current beef cattle feeding systems, increasing the environmental and economic cost associated with beef production.”

Wickersham’s study is designed to address the relationship between urea recycling, microbial nitrogen capture and supplementation strategies in both types of cattle consuming low-quality forage.

“Cattle provide a valuable service to society by converting low-quality sources of nutrients such as grasses, crop residues and byproducts into beef, which is a high-quality source of amino acids, minerals and vitamins,” Wickersham said.

“However, there is room to improve the efficiency of this conversion to reduce the environmental effects of beef production and increase consumer access to these vital nutrients, thus allowing more people to consume a diet meeting their requirements,” he said.

Increasing productivity

“We believe reducing the over-provision of protein by 10% potentially reduces nitrogen excretion from cattle by approximately 22 lb. per head per year, or 704 million lb. for the U.S. beef industry per year,” Wickersham said. “The potential savings, on a soybean meal-equivalent basis, is $1.4 billion per year.”

Wickersham’s latest research project, supported by a nearly $500,000 grant from the U.S. Department of Agriculture National Institute for Food & Agriculture, is titled “Enhancing Sustainability of Beef Production by Elucidating Subspecies Differences in Urea Recycling in Response to Supplementation.”

“We are doing this research because improper supplementation to cattle has environmental and economic cost, which ultimately decreases the affordability of beef for consumers,” Wickersham said.

The growth, reproduction and health of cattle are affected by the grass and hay they consume, and at times, supplements are provided to improve their ability to thrive on their diets, he said.

“Supplements are expensive and represent an increased use of nutrients,” Wickersham said. “By developing feeding systems that account for differences in cattle type, we can reduce the effects of cattle production without compromising the animal’s nutritional status.”

Completion of the proposed project will provide data allowing for precise delivery of supplemental nitrogen for cattle grazing low-quality forage across a wide array of production systems, he said. Capturing data in both subspecies enhances the global utility of these projects for meeting the increasing demand for animal proteins.

Wickersham chose to address the problem of over- and under-feeding protein in cattle diets by elucidating the differences in nitrogen utilization and recycling to improve the capacity to describe urea recycling and microbial capture of recycled nitrogen, both of which are essential to precision diet formulation, the announcement said.

“Ultimately, we believe precision diet formulation will reduce both overfeeding and underfeeding of nitrogen and increase the environmental, economic and social sustainability of beef production,” Wickersham said.

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