A cow's estrus cycle averages 21 days.

母牛的发情周期平均为21天。

A cow 's estrus cycle averages 21 days.

母牛的发情周期平均为21天。

An estrus is not a disease but a sign of a variety of conditions.

乏情不是一种疾病，而是一种多方面的体态迹象。

Anestrus (absence of estrus) is not a disease but a sign of a variety of conditions.

乏情不是一种疾病，而是一种多方面的体态迹象。

The number of the CEC was the most at estrus and remarkably (P<0.01) more than that of other stages.

角化上皮细胞在发情期数目最多，明显（P<0.01）高于其它各期；

Spring is their estrus, the sound all time in night like crow blood is for beckoning their 'Mating objects'.

春天是它们的发情期，夜间啼血般地叫个不住，是召唤‘婚配对象’哩！

If a dog to own the estrus period for the election of her husband masters, the eyes of a certain good, not anxious to lock.

如果自家的一条母獒到了发情期，主人为其选夫婿，看中某条好公獒，先别着急锁定。

Male chinchillas tend to be easier to handle because they are not subject to temperament fluctuations due to the estrus cycle.

雄性龙猫往往更容易相处，因为它们没有波动的发情周期。

Simple nature, care of the father loved his three children, has a beautiful appearance of the daughter, but she in the brink of estrus;

生性单纯、小心谨慎的父亲深爱着自己的三个孩子，有着美丽外貌的大女儿，不过她处在发情期的边缘；

"Quietkat" cat food is the best food for pussycats during estrus period, it maintains a balanced nutrition diet and to stabilize their emotion.

猫静猫粮是猫咪发情期最佳食品，保持营养均衡，稳定猫咪情绪。发情期前后参照以下喂食方式更加合理周到。