Genetic parameters of some productive and reproductive traits in sheep from the Bulgarian dairy synthetic population (BDSP) and its crosses with Lacaune and Assaf

Dominating in recent years Bulgaria are the sheep from Bulgarian Dairy Synthetic Population (BDSP) and its crosses with other dairy breeds. This turn leads to significant, scientifically based genetic phenotypic diversity different levels of productivity. The aim study is research characterize genotypic parameters main productive reproductive traits synthetic population breeds Lacaune Assaf. includes a total 3212 ewes reared 15 farms, as - 1114 ewes, BDSP Assaf 1052 1046 born period 2014 2019 including. Studied trait were: milk yield for standard 120-day I, II III lactation, biological fertility 1st, 2nd 3rd lambing live weight age categories. statistical model used was on animal /Animalmodel /, using software product VCE PEST (Groeneveld). Heritability selection lactation reaches low moderate medium values. lowest level h? varies 0.125 0.157, x 0.131 0.202, highest studied Lacaune, respectively 0.342 0.397. rates all three groups were 0.133 0.156, 0.040 0.112 0.100 0.122.