S. Chobanova1, D. Penkov2* 1Department of Morphology, Physiology and Nutrition, Section Animal Nutrition, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Animal Sciences, Faculty of Agronomy, Agricultural University, 12 D. Mendeleev Str., 4000 Plo

I. Pavlova1, D. Özdemir2, H. Lukanov3* 1Department of General Livestock Breeding, Faculty of Veterinary Medicine, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Agricultural Biotechnology, Faculty of Agriculture, Akdeniz Üniversity, Antalia, Turkey 3Department of Animal

H. Lukanov1*, I. Pavlova2 1Department of Animal Husbandry – Мonogastric and other animals, Faculty of Agriculture, Trakia University, Student’s campus, 6000 Stara Zagora, Bulgaria 2Department of General Livestock Breeding, Faculty of Veterinary Medicine, Trakia University, Stude

E. Shatskikh1, E. Latypova1, V. Fisinin2, S. Denev3, P. Surai3-5* Abstract. Commercial egg production is associated with various stresses decreasing productive and reproductive performance of layers. A growing body of evidence indicates that most of stresses in poultry production at t