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Beta-agonists Have Clear Effects on Cattle, Scientists Say

Beta-agonists Have Clear Effects on Cattle, Scientists Say

Ractopamine and zilpaterol have consistent effects when fed as recommended to cattle, scientists say at JAM 2014

At the Joint Annual Meeting of the American Society of Animal Science and American Dairy Science Assn. in Kansas City, Mo., this week, a group of scientists said beta-agonists provide clear and consistent effects when fed to cattle and swine as recommended.

Dr. Brad Johnson of Texas Tech says the compounds' mode of action on muscle tissue behaves in a specific manner, binding to naturally-occurring receptors in tissue – a different mode of action than steroidal implants.

The discussion on beta-agonists was reported by Tim Lundeen of Feedstuffs:

Ractopamine and zilpaterol have consistent effects when fed as recommended to cattle, scientists say at JAM 2014

"Beta-agonists have a direct effect on bovine muscle tissue in that the compounds increase the amount of protein synthesis in muscle fibers. Considering that protein accretion is the result of protein synthesis minus protein degradation (beta-agonists have some effect on protein degradation but is not a major focus), the increased protein synthesis results in more protein in muscle tissue, and therefore, larger muscle mass…"

Beta-agonists also have effects on adipose tissue development, but those effects are not as clear, Lundeen writes.

Continue reading "Effects of beta-agonists clear, consistent" on Feedstuffs.

Related stories:
Merck Decries Research Linking Increased Cattle Mortality to Beta Agonists
Zilmax Has No Apparent Detrimental Effect on Cattle, UNL Study Finds

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