D. Pamukova1*, G. Staykova2, N. Stancheva2, D. Panayotov1 1Department of Animal Science – Ruminant Animals and Dairy Science, Faculty of Agriculture,Trakia University, 6000 Stara Zagora, Bulgaria 2Agricultural Institute, 3 Simeon Veliki, 9700 Shumen, Bulgaria (Manuscript receive
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