Abstract
Abstract An experiment was carried out with New Zealand White rabbits to study the effect of four generations of selection on body weight at an age of 112 days. The response given as deviation of body weight at 112 days from control line and expressed as a regression (b) ± standard deviation was respectively 46.2 grams ± 9.6 and -80.4 grams ± 7.2 per generation for upward and downward selection. The realized heritability for upward selection in the high body weight line (HBW) was 0.11 ± 0.02 and for downward selection in the low body weight line (LBW) was 0.31 ± 0.02. The realized heritability from a regression of cumulative response on cumulative selection differential as a divergence between HBW and LBW was 0.19 ± 0.001. The heritability for body weight at 112 days estimated from paternal half-sib correlation was 0.46 ± 0.25.
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