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Some Effects of Obesity in Beef Females¹

Oklahoma State University,⁴ Stillwater 74074

Abstract

THE influence of plane of nutrition upon economically important traits of cattle has received considerable attention. Many studies have been concerned with low energy levels, but only limited data concerning the effects of excessive fat deposition on females have been reported. A high plane of nutrition for cattle has been shown to increase weight and skeletal size (Hansson, 1956; Reid et al., 1957; Crichton, Aitken and Boyne, 1959; Sorenson et al., 1959), decrease milk production (Hansson, 1956; Swanson, 1960) and shorten productive life (Hansen and Steensberg, 1950; Pinney, 1962) and total life span (Hansson, 1956) of cows. Most of the reported research has been with dairy cattle.

Knowledge of the effects of an extremely high degree of body fatness should aid in the interpretation of research within more practical planes of nutrition, and should help elucidate the optimum energy level for reproduction, lactation and survival of the beef female. The obiective of this study was to determine some effects of obesity in beef females.

¹ Journal Paper 1982 of the Oklahoma Agricultural Experiment Station, Stillwater. The authors express appreciation to J. B. Mickle for milk analyses and to J. E. McCroskey for reviewing the manuscript.

² Present address: Kansas Agricultural Experiment Station, Garden City, Kansas.

³ Present address: Texas A & M University, San Angelo, Texas.

⁴ Department of Animal Sciences and Industry.

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