Effects of Homologous and Heterologous Fresh Blood Serum on Motility of Cock Spermatozoa

The effect of some avian and mammalian fresh sera on the motility of cock spermatozoa was investigated with special reference to their spermicidal action. The motility of the spermatozoa in the media containing the fresh serum of cock, hen and tur key hen was almost similar to that in the media containing their heated sera throughout the one hour incubation. Addition of the fresh serum of female rabbit, ewe and male and female ducks at a high concentration into the medium resulted in immobilization of cook spermatozoa within several minutes, while the spermatozoa maintained a vigorous motility throughout incubation in the presence of their heated sera. These results suggest that cock spermatozoa are affected by the spermicidal factor in the mammalian fresh serum, and that the spermicidal factor is inclued in the fresh serum of male and female ducks, but not in the fresh serum of cock, hen and turkey hen.