R. Slavov1*, G. Mihaylova1, St. Ribarski2, D. Panayotov1, D. Pamukova1, D. Dragnev1 1Department of Animal Science – Ruminants and Dairy Farming, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Morphology, Physiology and Nutrition, Faculty of Agric
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