Abstract
The article assesses the lactation activity of first-calf heifers of the Holstein breed of a highly productive herd with different methods of keeping and milking technologies. It has been established that the highest milk productivity (8434 kg) is possessed by first-calf heifers with tethered content, with milking technology in the milk pipeline. The highest content of milk fat (4.09 %) and milk protein (3.18 %) was noted in milk obtained from free-standing cows with automated milking. It was noted that the highest rate of milk flow (2.45 kg/min) is typical for animals with loose housing with robotic milking technology, with the highest daily milk yield of 32.7 kg. It was determined that the peak of the highest productivity in the studied cows falls on the 3rd month of lactation, from the 4th month a systematic decrease begins. It has been proven that cows with a tethered content, with the highest milk yield (8434 kg) have an indicator of lactation constancy – 84.5 %, with a decrease in milk productivity (8353 kg and 7138 kg), it decreases (83.8 and 82.8 %), in loose housing groups with robotic and automatic milking technology, respectively. It has been established that in free-stall cows with robotic milking technology, the correlation between the rate of milk flow, the index of constancy and the coefficient of lactation stability is positive. In all the studied groups, the degree of influence of the highest daily milk yield on the coefficients of lactation constancy and sustainability is negative. It was determined that the lactation curves in the studied groups have a different character: high stable is typical for the control group; the 1st experimental group is characterized by high, but unstable lactation activity, the 2nd experimental group is unstable, sharply decreasing. It has been proven that in the group of free-range cows with robotic milking, a significant decline in milk yield was noted in the last months of lactation (by 7.4 %).
Published Version
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