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Carcass Characteristics of Beef Cattle as Influenced by Season, Sex and Hormonal Growth Stimulants^{1, 2,}

University of Arizona, Tucson

Abstract

Carcass merit of beef cattle can be influenced by many factors. Generally, heredity and environmental conditions are considered the basic determinants of carcass quantity and quality. The genetic influence with regard to carcass characteristics is constantly under investigation. Furthermore, nutritional and postslaughter factors are receiving more and more attention.

The environmental factor, ambient temperature, has not been investigated thoroughly as to its effects on carcass merit. Data in the literature considering climatic conditions which may affect carcass merit of finished beef cattle are seriously lacking. Warwick (1958) has stated that high environmental temperatures reduce growth rate and presumably result in lower rates of fattening in cattle and swine. However, Sugahara et al. (1969) reported that high ambient temperatures increased carcass fat deposition in rats.

A series of experiments was conducted to study the influence of season, sex and hormonal growth stimulants on feedlot performance and carcass characteristics of beef cattle. Feedlot performance data have been discussed by Ray, Hale and Marchello (1969).

¹ Arizona Agricultural Experiment Station Technical Paper No. 1603.

² These studies were conducted in cooperation with the U.S.D.A. under Western Regional Project W-46.

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