Investigation of sperm-induced cervical leucocytosis by a double mating study in rabbits

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Abstract
The cervices of 2 normally mated does at 1 h post-coitum were examined for the presence of leukocytes and compared with the cervix of an unmated doe. Cervical leukocytosis (50 .times. 106 leukocytes) was demonstrated following mating with either of 2 bucks, but not in the unmated doe. Each of 16 does was single-mated with 2 bucks whose offspring could be distinguished clearly. The interval between 1st and 2nd mating was 0, 0.5, 1 or 4 h. One buck produced 68 offspring, the other buck produced 37. Cervical leukocytosis did not impair the fertility of the 2nd buck even if it was the inferior buck; fertilizing spermatozoa may traverse the cervices, even through large numbers of leukocytes. The differences in fertility between spermatozoa from different bucks during competitive fertilization may reflect different capacitation times of these spermatozoa. [Sperm-induced leukocytosis may also occur in the human cervix.].

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