Genetic evaluation of chickens is based on body weight at slaughter age. This selection has resulted in evolution of the whole growth curve from embryo to adult (Timon and Eisen, 1969). Including growth curve in selection could allow to alleviate undesirable changes due to selection on juvenile body weight, especially in adult body weight. Growth curves have thus been widely used in chicken, particularly the Gompertz curve (Mignon-Grasteau and Beaumont, 2000). Moreover, selection experiments have shown that selecting  on the form of the growth curve was feasible (Johnson and Gowe, 1962 ; Ricard, 1975). However, little is known about the genetics of the growth curve parameters (Grossmann and Bohren, 1985 ; Barbato, 1991 ; Mignon-Grasteau et al., 1999). These studies have been realised on layer type chickens, commercial broilers or experimental lines, but, to our knowledge, no estimate was available on commercial meat-type lines of chickens for extensive breeding. Our aim was thus to provide genetic parameters of the growth curve parameters on a slow growing commercial line of chickens .

S. Mignon-Grasteau, C. Beaumont

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 11, , 11.03, 2002
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