Clinical findings, skim milk progesteron profiles and conception rate after artificial insemination in cows bearing follicular cysts with a Graafian follicle.

概要

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The conception rate by artificial insemination (AI) was compared between two groups of cows bearing follicular cysts (FC): Cows of group 1 were cyclic and accompanying a Graafian follicle (GF) and those of group 2 were not accompanying GF and apparently non-cyclic. Behavioral estrous cycles and skim milk progesterone levels were monitored throughout the experimental period. In all of 21 cows of the first group (FC-GF), estrus ceased within a couple of days after AI, and in most cases the GF ruptured spontaneously to form the corpus luteum. Fourteen Cows (66.7%) of this group were conceived by the first AI. In contrast, in 9 cows of the second group (FC only) abnormal sexual behaviour continued after AI, and no one was conceived. HCG or GnRH analog treatment was required for successful insemi-nation in this group. With respect to progesterone levels, the first group exhibited patterns similar to those in normal pregnant or cyclic cows, whereas the pattern of the second group was characterized by the continuous low levels (less than 1 ng/ml) throughout the observation period. These results indicate that any treatment is not required before AI in cows of FC-GF type, while hormonal treatment is prerequisite to expect a good conception rate in cystic cows without GF.
日本繁殖生物学会の論文