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Inability to Predict Sexual and Aggressive Behaviors by Plasma Concentrations of Testosterone and Luteinizing Hormone in Hereford Bulls¹

University of California, Davis 95616

Abstract

The relationships between sexual and aggressive behaviors and levels of plasma testosterone and luteinizing hormone (LH) were examined in Hereford bulls at 18 and 24 mo of age. Concentrations of hormones in bulls during periods of sexual rest (13 blood samples collected from each animal during a 24-h period) were compared with individual differences in sexual and aggressive behaviors when exposed to restrained females, either individually or in groups. Nearly all correlation coefficients were low and nonsignificant. It was concluded that individual differences in sexual performance and aggressive behavior cannot be predicted based on circulating levels of testosterone and LH in bulls during periods of sexual rest.

¹ The authors acknowledge the assistance of G. Watson for conducting the LH assays, and D. Barnes and R. Scadden for blood collection. The authors thank Dr. G. Niswender and the Natl. Hormone and Pituitary Program for providing components for the radioimmunoassays.

² Dept. of Anim. Sci.