Effect of Castration on Skeletal Muscle Protein Turnover and Muscle Enzyme Activities in Cattle

Authors

Tommy L. Wheeler, U.S. Meat Animal Research CenterFollow
J. Brad Morgan, Colorado State University
Mohammad Koohmaraie, U.S. Meat Animal Research Center
John D. Crouse, U.S. Meat Animal Research Center
Jeff W. Savell, Texas A & M University

Date of this Version

1993

Document Type

Article

Comments

Published in Beef Research Program Progress Report (1993) No. 4 (Part 1): 135-136

Abstract

It is well established that proteins are continually synthesized and degraded in skeletal muscle, but the proteolytic enzymes involved in muscle protein degradation remain unknown. It is hypothesized that the calpain proteolytic system, which is known to be important in postmortem protein degradation and thus in meat tenderization, could also be involved in or even possibly initiate muscle protein degradation in the living animal.

It is well documented that intact males grow more rapidly (15 to 17%), utilize feed more efficiently (10 to 13%) and produce higher yielding carcasses with less fat and more lean meat than castrates. However, the underlying mechanisms for these advantages have not been determined. The objective of this study was to determine the effect of gender (bull vs steer) on the relationship between muscle enzyme activity and muscle protein turnover in growing cattle.