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The study was carried out on 24 cows and 20 heifers of the black-and-white breed in conditions of commercial production. The animals before calving were assigned randomly to 4 groups. Each group had 2 subgroups of 6 multiparous cows (A) and 5 heifers (B). The control group (I) did not receive any additional carotene or vitamin A. Cows in group II were given additional 300 mg of synthetic β-carotene...
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