STUDIES ON THE ESTRUS IN PIGS
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概要
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The relationship between the ovarian cycle and the estrous symptom cycle of sows were investigated by histological observation of sections collected from ovaries and vaginal vestibule of the same animals.Ovarian and vaginal vestibule tissues were collected from 65 sows at varying stages of their estrous symptom cycles (12 sows in proestrus, 11 sows in estrus, 10 sows in postestrus, and 32 sows in diestrus).1. The ovarian cycle of a sow was classified by gross and histological observations of the ovaries.Early follicular stage: Graafian follicles were noted in their growth in the ovaries. The follicles were about 5-7mm in diameter and their granulosa layers were about 50-65μ thick, while their theca interna were about 40-55μ thick.Late follicular stage: The nearly mature follicles which were noted were about 8-10mm in diameter. The thickness of granulosa layers and theca interna were respectively 35-55μ and 35-45μ.Ovulatory stage: The follicles at this stage were about 8-12mm in diameter. The ruptured follicles showed hemorrhage at the follicular stigma.Early luteal stage: The ovaries at this stage are featured by the presence of ruptured follicles, and the hemorrhage at the follicular stigma was found to have disappeared.Middle luteal stage: Gross findings of ovaries at this stage were the presence of blooming corpus luteum in its size of about 9-14mm in diameter.Late luteal stage: The ovaries at this stage indicated presence of the regressing corpus luteum and that of growing follicles of 4-6mm in diameter.2. Of varying thickness of mucosal epithelium of vaginal vestibule in the ovarian cycle and the estrous symptom cycle, the thickest stage was the ovulatory stage amounting to 148μ, followed by the estrus stage amounting to 138μ, while the thinnest stage was the middle luteal stage amounting to 36μ, followed by the diestrus amounting to 39μ.3. With respect to the relationship between the ovarian cycle and the estrous symptom cycle, correlation was noted between the proestrus and late follicular stage, between estrus and ovulatory stage, between postestrus and early lutel stage, and between diestrus and middle luteal stage.
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