Abstract
Several studies linking speed of hatching to post-hatching performance indicate that length of incubation period may be heritable. Bohren et al. (1961) have cited several of these studies. Smyth and Howes (1949) have demonstrated a definite response to two-way selection for short and long incubation periods. Byerly (1934) observed that inbred Leghorns hatched 12 hours later than non-inbred Leghorns. Henderson (1950) found that incubation periods varied with different breeds and crosses. MacLaury and Insko (1968) reported strain differences in length of incubation period.Each of the above mentioned reports are based on inter-strain comparisons. There are a few reports which provide some intrastrain evidence. Hays (1941) reported several parent-offspring correlations which indicated heritability of the trait. Calculation based on data of Smyth and Culton (1947), using regression of offspring on midparent, produced an estimate of heritability of the trait of 0.35. Becker et al. (1966) reported heritability of hatching time…
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