英语语法分析

The follicular waves of postpartum heifers is made of 3 ~ 4 waves in the first estrous cycle.

产后母牛在第一发情周期中，卵巢卵泡的生长发育以3或4卵泡发育波为主。

Morphologically, round, oval or fusiform mast cells were present in all stages of estrous cycle.

输卵管内肥大细胞在黏膜皱襞、肌层和外膜中均有分布。

Histological structure of follicular system in yaks during the estrous cycle was similar to that of cattle and buffalo.

结果表明，牦牛发情周期中卵巢卵泡发育的组织结构与其他牛基本相似。