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As a result of our studies It was found that the average milk yield of the first-calf heifers of Holstein lines was 18% higher, the butterfat content in milk by 13.3, and the fat percentage in milk was 0.08 percentage points lower, compared with animals of the Dutch lines.

COMPARATIVE ANALYSIS OF DAIRY PERFORMANCE OF FIRST-CALF HEIFERS IN THE DEVELOPMENT OF HIGHLY PRODUCTIVE HERDS