The atretic follicles are found at the different stages of the development of the ovary. 结果显示卵巢分叶呈条索状，卵泡发育中没有出现卵泡腔，卵泡细胞始终为单层，卵泡膜随卵泡发育成熟由单层转变为多层，闭锁卵泡在卵泡发育的各个不同时期都有出现。
In recent years, the development of ultrasonography has contributed a great deal to our knowledge of follicular dynamics and its regulation mechanisms. 近年来随着超声波扫描技术的发展，人们对家畜卵泡发育模式及其调控机理有了更深入的认识。
