The annual reproductive cycle of mink (Mustela vison).
نویسندگان
چکیده
Reproductive organ development, plasma sex steroid concentrations and fur growth patterns were determined for pubescent and adult mink of both sexes, at 1tc~ 8-week intervals, between July and the following June. Plasma estradiol concentrations and weights (mg/kg) of ovaries, oviducts and uteri decreased slightly in both pubescent and adult females during the first half of anestrus (July to October), then increased slowly throughout the second half of anestrus (October to December). During proestrus (January to February) plasma estradiol concentrations and oviduct weights reached maximum values. During estrus (late February to March) ovarian weights were maximal prior to mating-induced ovulations (before March 11) and subsequently reduced, whereas uteriffe weights continued to increase until implantation (April 8). During estrus, plasma estradiol concentrations prior to mating were reduced (P<.05) from previous peak concentrations and were reduced further following mating. Estradiol remained low throughout pregnancy and lactation. Plasma progesterone remained at or near non-detectable concentrations throughout anestrus, proestrus and estrus, increased slightly (P<.05) on
منابع مشابه
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عنوان ژورنال:
- Journal of animal science
دوره 48 3 شماره
صفحات -
تاریخ انتشار 1979