STUDIES ON ESTRUS OF SWINE
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概要
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In order to investigate the time of appearance of first estrus in swine, histoanatomical studies were made with various genital organs such as ovaries, oviducts, uteri, cervical canals, vagina, and vaginal vestibules.The gilts used for the test were 214 Landraces, 12 Large Whites, 8 Hampshires, 5 Durocs, and 96 crossbreds.1. In terms of correlation among various genital organs of the Landrace glits (in their ages of 170-180 days each weighing 90-95kg) prior to appearance of their first estrus, no significant correlation was noted between the weights of ovaries and the other genital organs. Significant correlations were noted between the sizes of follicles and oviducts, uteri, cervical canals, and vaginal vestibules.2. With respect to the growths of various genital organs of gilts prior to appearance of the first estrus, the weights of uteri, cervical canals, and vaginae indicated rapid gains since their ages around 190-200 days after their births. In terms of weight gains, rapid gains were noted in the weights of cervical canals and vaginae from the time of body weight of approx. 110kg.3. Changes in various genital organs following appearance of the first estrus were compared with those before appearance of the first estrus to find that there were no changes in the early follicular stage, while the weights of uteri and cervical canals gained double each and the weights of uteri and the other genital organs gained about 6 times and about twice, respectively. In terms of comparison between the luteal stage and ovulation stage in the weights of various genital organs, it was noted that the weights of ovaries gained at the luteal stage, whereas the weights of the other genital organs were reduced at the luteal stage.4. With respect to time of appearance of the first estrus of gilts, the first estrus was initiated from around the age of about 170 days and the rate of the appearance of estrus increased by about 10% as 10 days each elapsed. At the age of about 250 days, the first estrus was appeared in about 90% of the gilts. The rate of the appearance of estrus increased by about 8-10% for weight gain of 5kg each. At the time with body weight of 130kg, the appearance of the first estrus was more than 90%.
- 日本養豚学会の論文
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