Luteinizing hormone, testosterone, and behavioral response of male-oriented rams to estrous ewes and rams

Article Abstract:

Homosexual rams exposed to either estrous ewes or other rams did not have increased luteinizing hormone (LH) secretion. This was not attributed to pituitary or gonadal inssensitivity since LH-releasing hormone injection increased both LH and testosterone levels in these animals. Increase in testosterone concentration was higher in five of the seven homosexual rams when they were exposed to males as compared to when they were exposed to ewes. Thus, homosexual behavior in rams does not affect LH secretion but testosterone secretion may increase in some individuals.

Sexual behavior, Rams

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Ram influence on ovarian and sexual activity in anestrous ewes: effects of isolation of ewes from rams before joining and date of ram introduction

Article Abstract:

The 2-year experiment on the relationship of isolation of ewes and their sexual response to the ram effect and to the breeding season was conducted at two locations, with 140 ewes at each location,assigned to 4 treatments: May-isolated, May-adjacent, June-isolated, and June-adjacent. Eighty-six percent responded to the ram effect, however, isolation from rams did not seem to influence response to the ram effect. Response was noted to be greater in June and in the 2nd year.

Behavior, Physiological regulation, Biological control systems, Sex (Biology), Sheep breeding, Sexual cycle

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Effects of equine chorionic gonadotropin on reproductive performance in anestrous mink

Article Abstract:

Estrus was induced in anestrous mink by using various doses of equine chorionic gonadotropin (eCG) and human chorionic gonadotropin (hCG). A control group was given saline. There was an improvement of reproductive function in anestrous mink treated with eCG. None was observed in the group receiving saline. Further administration of hCG did not improve prior treatment of eCG thus underlining the potential use of treating anestrous mink with eCG during the breeding season.

Chorionic gonadotropin, Chorionic gonadotropins, Minks

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