D. Pamukova1, N. Rusenova2, T. Kolev3, S. Chobanova4, N. Naydenova1* 1Department of Animal husbandry – Ruminants and Dairy farming, Faculty of Agriculture, Trakia University, 6015 Stara Zagora, Bulgaria 2Department of Veterinary Microbiology, Infectious and Parasitic Diseases, Faculty
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