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F. H. WILCOX

Summary.

Chemical analysis has revealed that the seminal plasma of the chicken contains high levels of acid phosphatase and low levels of alkaline phosphatase. There were significant differences in the acid phosphatase levels of individual males, but not of different breeds. Analysis of various sections of the male reproductive system demonstrated high levels of the acid phosphatase in the vas deferens and epididymis, and lesser but substantial amounts in the other sections tested.

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F. H. WILCOX and W. S. CLOUD

Summary.

Alkaline phosphatase level was measured in parts of the reproductive system of laying White Leghorn females of a random bred control line and it was markedly higher in the ovary than in the oviduct, egg yolk, egg white and vitelline membrane. Within the ovary the highest levels were observed in the membranes of large follicles, whereas levels were very low in contents of these follicles. A line with a high level of phosphatase in blood serum did not differ from the random bred control line in the phosphatase level of ovarian follicle membrane or vitelline membrane. However, it had a significantly higher level of the enzyme in egg yolk and ovarian follicle contents, as well as in blood serum. The role of alkaline phosphatase in the functioning of the ovary is discussed.

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R. B. BUCKLAND, F. H. WILCOX and C. S. SHAFFNER

Summary.

There was variation in the activity of fumarase, aconitase, isocitric dehydrogenase and malic dehydrogenase in spermatozoa from different strains of fowl. Homozygosity for rose comb was associated with a significant effect on the level of fumarase, aconitase and isocitric dehydrogenase activity in spermatozoa. Semen from males with this genetic characteristic produced poor fertility; the duration of the fertile period in the hen and the overall fertility were reduced. There was no significant correlation between the activity of any of the four enzymes in spermatozoa. Fumarase activity was significantly correlated with fertility. Duration of fertility in hens and the general level of fertility after single inseminations were correlated. It was concluded that the low level of fumarase activity in spermatozoa from homozygous rose comb males may be at least part of the reason for the low fertility produced by their semen.