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Genetic Relationships Between Mature Weight and Time Taken to Mature within a Breed

A.R.C. Animal Breeding Research Organisation, Edinburgh 9 and Texas A&M University, College Station 77843

Abstract

Estimates of additive genetic parameters for size at maturity and time taken to mature are needed for predicting direct and correlated responses to selection for these important traits. The within-breed association between size and earliness of maturing is also of considerable theoretical interest in connection with the time scale of growth.

A relationship of proportionality between the time a species takes to mature and the 0.27th power of its mature body weight was found by interrelating estimates of growth curve parameters (Taylor, 1965). The same technique was later applied to different breeds and strains within a species and also to different sexes within a breed, and similar results were obtained (Taylor, 1968). An investigation of the same relationship is now presented for genetic differences between individuals within a breed.

The limitations of several growth equations commonly used for fitting size-age data of animals have been described by Eisen, Lang and Legates (1969) and Brown, Fitzhugb and Cartwright (1971).

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