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Fluid was collected from the region of the peritoneum surrounding the ovarian pocket of domestic hens at about the time of ovulation. This fluid, diluted to 10%, increased the motility of chicken spermatozoa by a maximum of sixfold at 40 degrees C in vitro. Gel filtration revealed two peaks of motility-stimulating activity: one was identified as calcium and the other as a heat-labile substance of low M(r) (200). It is suggested that this motility-stimulating activity may facilitate fertilization, as spermatozoa are normally stored in a quiescent state within the oviduct and can be passively transported by cilia to the site of fertilization in the ovarian pocket.

Factors from fluid of the ovarian pocket that stimulate sperm motility in domestic hens