Thanks to long and targeted selection, it was possible to achieve certain successes in obtaining large quantities of milk, but at the same time the level of reproductive ability of cows significantly decreased. According to the study, the most optimal age for first insemination in order to obtain good milk production from cows and at the same time maintain reproductive qualities at a good level is the age of 15 months.
age of first insemination, first heifer, service period, milk production
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