In order to properly arrange production and properly maintain and manage different stages of pregnant cows, and to facilitate prenatal preparation, the cow's due date must be calculated. Calculation method: Generally, the pregnancy period of the cow is 280 days, and the method of “minus 3 plus 6†may be adopted, that is, the grazing month is the breeding month minus 3, and the date of the grazing is the breeding date plus 6. For example, the last breeding time of a cow is July 15, 2017, and the cow's expected date of birth is April 21, 2018. The final breeding time for the other cow is January 29, 2017. The expected date of this cow is November 4, 2017. Month: 1+12-3=October, date: 29+6=35 days (October 31 is November 4th). In production practice, in order to reduce cumbersome calculations, the cow's expected date of birth is often set as a cow's pregnancy calendar. Based on the date of mating, the cow's due date can be determined.
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