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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 breeding age is around 2 years, so that the first calving age is about 3 years. This means (1) the heifers will not produce milk before they are three years old, and (2) that if you have ten cows between 3 and 9â° years of age, you will be replacing nearly one and a half a year (10 cows divided by 6â° years).airy cattle husbandry 62 High milk production is nice, but a low calving interval counts too ! Betty produces the 3240 litres in 3 years, but if she had a lower calv-ing interval her average daily milk production would increase greatly. The kinds of records worth keeping depend on the production goal.