Life Span and Reasons for Disposal of AI Beef Sires
- 1 January 1967
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Animal Science
- Vol. 26 (1) , 136-138
- https://doi.org/10.2527/jas1967.261136x
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. Copyright © 1967. American Society of Animal Science . Copyright 1967 by American Society of Animal ScienceThis publication has 0 references indexed in Scilit: