Selection of AI beef sires in performance testing stations in France is aimed at improving muscle growth capacity. Initially, final test weight and muscularity scoring were the only traits recorded for predicting this capacity. In early eighties an experiment failed to prove any additional efficiency of scanning, using the devices available at that time for estimating body composition (Rehben, 1982). A new performance testing procedure has been applied since then, with the measurement of feed intake in order to include feed efficiency as a new selection criterion. Selection on that trait should improve the biological efficiency of fattening and was expected to participate in the improvement of muscle growth capacity (Ménissier et al., 1986). To evaluate the actual utility of feed intake measurement, an experiment was conducted for estimating the genetic parameters of fattening traits together with slaughter traits, more specifically the genetic correlation between feed efficiency and body composition.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 10, , 10.08, 2002
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