Abstract
The article presents the results of a study on the dependence of the milk performance in first-calf heifers on the timing of their productive insemination, carried out using modern automated systems for monitoring the physiological state of animals. It has been established that first-calf heifers inseminated on days 90–110 of lactation possess the highest milk yield, which is 9.29–21.96% higher than that of cows inseminated at earlier or later dates.
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