recurrence of estrus

例句：

1. 1.The animal's recurrence ofestrus is a significant factor inits breeding behavior.
   动物的发情期重复是其繁殖行为的一个重要因素。
2. 2. The studyfound that the recurrence ofestrus was associated with increased fertility rates.
   研究发现，发情期的重复与生育率的增加有关。
3. 3. In thisspecies, the recurrence of estrus isinfluenced by environmental factors such as temperatureand humidity.
   在这个物种中，发情期的重复受到温度和湿度等环境因素的影响。