calving-service interval

例句：

1. 1.The farmer needs to calculate the calving-service interval for his herd of cows.
   这位农民需要计算他的奶牛群的牛群放牧间隔。
2. 2.The calving-service interval is an important factor in determining the optimal grazing pattern.
   牛群放牧间隔是决定最佳放牧模式的重要因素。
3. 3. The calving-service interval can vary depending on the weather conditions and the health of the animals.
   牛群放牧间隔可以根据天气条件和动物健康而变化。