Models of efficiency and carcass composition have several uses in animal breeding, particularly because these traits are dynamic with time and weight. Models have been used to adjust data, determine selection objectives, suggest selection criteria, and extend results of experiments. Models are helpful when carcass value is not linearly related to individual traits. Use of a model to determine the suitability of different cattle genotypes for different markets and optimal slaughter weights under different management is illustrated. Future developments using dynamical systems approaches, simplified carcass trait models, and knowledge of genes and their physiological effects could make predictions more reliable.

G. L Bennett, C. B Williams

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 25: Lactation; growth and efficiency; meat quality; role of exotic breeds in the tropics; design of village breeding programmes;, , 93–100, 1998
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