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Life Span and Reasons for Disposal of AI Beef Sires^{1, 2,}

University of Florida, Gainesville

Abstract

Reproductive inefficiency was shown to be the major reason of disposal (47%) of beef sires in AI. Problems of collection, due to inability or lack of desire to serve, and poor temperament were the next most frequent reasons (16%). Few sires (6%) have been removed from service because of the performance or characteristics of their offspring, due in part to limited tenure. Average age at entry into service was 3.20 years, and average tenure was 2.79 years. Useful life span has increased in recent years (1960-64) to an average of 3.15 years. Equations are presented from which useful tenure of a sire can be estimated when age of entry into service is known.

¹ Florida Agricultural Experiment Stations Journal Series No. 2401.

² The financial support of the National Association of Animal Breeders is gratefully acknowledged.

³ Departments of Dairy and Animal Science.

⁴ AI studs in the U.S. and Canada have supplied data for this investigation, as have the breed registry organizations. Assistance was given by University of Florida personnel F. G. Martin, A. E. Brandt, P. T. D. Arnold, C. Vanveldhuisen, S. Kephart, R. A. Bradley et al. Sincere appreciation is expressed to all by the authors.