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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.
The optimum age is 15 months or more. She should also be weighing at least 60% of the average weight of the main herd or the body weight of a mature cow that is comprised of similar breeding to her.She must also have good pelvic area and good capacity in her hips and barrel area before she can have a calf.eifers can be bred by the time they â¦ reach between 9 and 18 months of age, (preferably 15 months of age or older) and/or weigh 60% of the average mature cow-herd weight, since some heifers may not be able to be bred until they're ~20 months old, like with most Brahman heifers for instance.