due calving date

例句：

1. 1.The farmer needs to know the due calving date for his cows.
   农民需要知道他的牛的配种日期。
2. 2.The dairy farm has a strict schedule for their cows' due calving dates.
   这个奶牛场对它们的奶牛的配种日期有严格的安排。
3. 3. The veterinarian advised the farmer to check the due calving date of his cows.
   兽医建议农民检查他的牛的配种日期。