【摘要】 <正> 有关淡水豚类生殖方面的研究,18世纪末已有学者对亚河豚Inia geoffrensis、拉河豚Pontoporia blainvillei及恒河豚Platanista gangetica开展了工作,但真正深入研究的还是在本世纪七十年代,如Harrison、Brownell和Boice等综述了前人的早期工作,详细研究了这三类豚的生殖和生殖器官的特征,并进行了比较。对白鱀豚生殖的研究,除更多还原

【Abstract】 Informations about reproduction and the genital organs of five female and three male Lipotes have been reported, Their general appearances have been described and their tissue structures observed. The left and right ovaries of an immature female 192 cm in length have the same dimension and weight and are similar in outer appearances. Prom the length of their foetuses, the two pregnant temales of 250 cm and 253 cm each would obviously have their parturition in February or in March. A newborn Lipotes is about 70 cm long. The corpus luteum of pregnanus is fungiform. When the foetus is 54.5 cm, the dimension of the corpus luteum is 3.9×3.1×1.1 cm and 4.55×3.2×1.8 cm, when the foetus is 73 cm. The structure of the corpus luteum of Lipotes is somewhat different from that of Platanistai gangetica or Pla-tanista indi or Neophocaena phocaenoides. The corpus luteum of Lipotes has no fibrouscore, and its granulosa lutein cell is bigger than that of other species, the biggest cell reaching 46 μm. The vagina of Lipotes has more longitudinal and transverse folds than those of other species of fresh water dolphins. Besides the dense longitudinal folds, it has six rings of transverse folds which constitute a more perfect structure for preventing water from entering the uterine cavity.更多还原