still estrus

例句：

1. 1. The cow is still in its estrus period, so we can't milk it yet.
   这头奶牛仍处于发情期，所以我们还不能挤奶。
2. 2. The horses are in their breeding season, and they need to be mated to produce offspring.
   马正处于繁殖季节，需要配种以产生后代。
3. 3.The birds are in their breeding season, and the females are ready to mate with males.
   鸟类正处于繁殖季节，雌性已经准备好与雄性交配。