Abstract
GUTOWSKA et al. (1943) observed that hens which averaged 264 eggs during the first laying year had an average of 14 King-Armstrong units of blood plasma alkaline phosphatase activity. Hens which averaged 176 eggs during the same year had an average of only 12 King-Armstrong units. The increased egg production due to selection for high level of alkaline phosphatase in serum has been reported. Wilcox et al. (1962) estimated a heritability of 0.36 for alkaline phosphatase level utilizing Random-bred White Leghorns previously described by King et al. (1959). Genetic correlation between alkaline phosphatase level and egg production was 0.50, environmental correlation was —0.14, and phenotypic correlation 0.01. Combined sire plus dam components were used in estimating heritability and correlations. Wilcox (1963) reported the development of a line of White Leghorns, which had a six-weekold serum alkaline phosphatase level in the 5th generation of selection that was approximately three times the…
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