北京黒豚における雌生殖器の発達

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  • Development of the Reproductive Organs in Beijing Black Gilts.

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The process of development of reproductive organs was investigated in 39 Beijing Black gilts from 60 to 210 days of age.<br>(1) The total weight of the vaginal vestibule, vagina, cervical canal and uterine body increased rapidly between 60 and 90 days of age and then increased slowly between 90 and 195-210 days of age. The total length of these organs increased rapidly between 60 and 75 days of age(P<0.05) and then increased gradually between 75 and 195-210 days of age. The weight and length of the uterine horn increased slowly between 90 and 165 days of age, and then increased markedly between 165 and 180 days of age (P<0.05, P<0.05).<br>(2) The weight of the ovaries increased between 60 and 90 days of age and then remained relatively constant until the appearance of corpora lutea. Morphological observations revealed that 33.3% of ovaries (2/6) had less than 4 protruding follicles on the surface at 60 days of age, and that 100% (6/6) had more than 5 protruding follicles at 90 days of age. The corpora lutea appeared in 71.4% (10/14) and 100% (8/8) of ovaries at 180 and 195-210 days age, respectively.<br>(3) Hisological observations revealed many primordial follicles, primary follicles, secondary follicles and vesicular follicles in all ovarian sections at 60 days of age. The diameter of the vesicular follicles increased from 60 to 90 days of age, and the number of vesicular follicles increased between 60 and 120 days of age. Many vesicular follicles were observed in ovarian sections at 120 days of age. There were no histological changes in ovaries from 120 days of age to puberty.<br>(4) These results indicate that Beijing Black gilts attain puberty between 165 and 180 days age.

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