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In several of the studies, when stressed-out female rats had their ovaries (the female reproductive organs) removed, their chemical responses became equal to those of the males.
解词：
Stressed-out:有压力的，紧张的
Ovary:（妇女或雌性动物的）卵巢
Equal to:和...一样
析句：
句子主干their chemical responses became equal to those of the males. Have sth. done: 某事被别人做，这里表示雌鼠的卵巢被人移除。Those指代the chemical responses。
翻译：
在好一个研究中，当重压之下的雌鼠的卵巢（雌性的生殖器官）被移除后，它们的化学反应变得跟雄鼠一样。