L. Abdellaoui1,2, N.A. Khelifi-Touhami *1, F. Mebkhout1,2, D. Tarzaali1, W.I. Yahiaoui1, T.M. Hamdi2, N. Ouchene1 1Institute of Veterinary Sciences, University of Saad Dahlab, Blida 1, BP 270, Street, Algeria 2HASAQ Laboratory, National Veterinary School of Algiers, 16000 Algiers, Alg

I. Marinov1, D. Dimov2, T. Penev2* 1Department of Animal Husbandry – Ruminants and Dairy Farming, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Applied Ecology and Animal Hygiene, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bul