Abstract
A PREVIOUS report (Lepore, 1965) suggested three possible mechanisms for the achievement of genetic progress when chicks are selected for growth rate on a methionine deficient diet. Line separation was considered to occur through heritable differences in (a) methionine absorption and utilization, (b) appetite, or (c) some combination of (a) and (b). The data reported indicated that there were no between line differences in methionine requirement although large differences in growth rate were observed. It was concluded that alternative (a) was not operative in establishing the growth-selected lines.The current study was conducted to ascertain the influence of appetite upon selection for growth rate with a methionine deficient diet. The results of growth trials are reported in which the feed intake of two fast growing lines developed by selection on either a normal or a methionine deficient diet was restricted to that of two similarly selected slow growing lines. Preliminary…
Published Version
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