Genotype‐level of protein interaction for growth rate in broilers

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Abstract
1. Two groups of White Plymouth Rock which were related to each other as half‐sibs were fed on diets containing either a normal or reduced amount of protein. 2. Compared with the normal diet the low‐protein diet caused a decrease in growth rate which at 38 d was 37% and 25% for male and female chickens, respectively. 3. A genotype‐level of protein interaction was demonstrated for weight at 38 d. Expressed as a genetic correlation for the same trait and measured in the two feeding environments the values were about 0.33. 4. In estimating the genetic correlation the interaction as well as the covariance method were used. The two methods did not give the same estimates. 5. Heritabilities for weight at 38 d tend to be larger in the low‐protein environment.