Authors
Rositsa Shumkova
Research Centre of Stockbreeding and Agriculture, Agricultural Academy, Smolyan, Bulgaria
Ralitsa Balkanska
Department “Special Branches”, Institute of Animal Science, Agricultural Academy, Kostinbrod, Bulgaria
Delka Salkova
Department of Experimental Parasitology, Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences, Sofia, Bulgaria
Peter Hristov
Department of Animal Diversity and Resources, Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Sofia, Bulgaria