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A female should be retired from breeding at the age of 7 years maximum. A female Yorkie may need to be retired much younger and this will depend on the recommendation of an experienced and trusted veterinarian who makes a determination after evaluating the individual dog's health and history.
1. A cow should be bred back after she has had a calf. The optimum time to breed her is 45 to 60 days after she has had a calf. In order to get her to calve on the same date as the previous years, allow for 80 to 90 days of rest before getting her bred again.epending on the breed of the heifer, most heifers will start to show the first signs of heat when they are between 9 and 22 months of age. 1  The rate of sexual maturity or puberty is determinate of genes and breeding.