Role of atresia in establishing the follicular hierarchy in the ovary of the domestic hen (Gallus domesticus)

摘要: Summary. At peak laying periods the ovary of domestic hen contained 30\p=n-\100small yolky follicles with diameters varying between 1 and 8 mm. In general, number these healthy decreased increasing size in that there were about 20 a diameter 1\p=n-\2mm follicle (mean mm (the hierarchy large, follicles) varied 4 7. By using dye-marker, growth from 3 to 5 was estimated take days, mm, 2 days ovulation, 6 days. No information obtained for because dye did not enter smaller follicles. Between 25 small atretic. The reduction time high incidence atresia suggests this is normal fate birds rate lay. marked contrast, only one large observed be atretic throughout whole experiment. These two very different levels serve define distinct groups range studied. Ovulation appears product complementary mechanisms, initiation other controlling at which are lost through atresia.