Some productive and reproductive traits in sheep from the Bulgarian dairy synthetic population (BDSP) and its crosses with Lacaune and Assaf: 2. Phenotypic parameters
2021
Kalaydzhiev, Georgi
Bulgarian Dairy Synthetic Population (BDSP) and its crosses with other dairy breeds are the most numerous sheep population in Bulgaria. There are significant phenotypic diversities and different levels of productivity. The aim of the study is to research and characterize the phenotypic parameters of the main productive and reproductive traits in sheep from the Bulgarian dairy synthetic population and its crosses with the breeds Lacaune and Assaf. The study includes a total of 3212 ewes BDSP and their crosses with Assaf and Lacaune. Studied trait were: milk yield for a standard 120-day period of I, II and III lactation, biological fertility of the 1st, 2nd and 3rd lambing and the trait-live weight of different age categories. The software product SYSTST 13 and SPSS-Descripive statistics were used to conduct the study. With the highest milk yield of the 1st, 2nd and 3rd lactation were the sheep BDSP x Lacaune-186.28 l, 194.03 l, 200.56 l, followed by BDSP x Assaf-184.27 l, 191.87 l and 198.64 l and those of BDSP-134.18 l, 139.48 l and 144.33 l. The average phenotypic values of the traits live weight at weaning, at 18 months and 2.5 years are close-respectively in BDSP-25.21 kg, 60.59 kg and 65.50 kg, for BDSP x Lacaune-25.17 kg, 60.52 kg, 65.44 kg and for BDSP x Assaf-25.19 kg, 60.58 kg, 65.67 kg. Fertility indicates the highest average values of the crosses BDSP with Lacaune from 1.53 to 1.59, followed by BDSP x Assaf from 1.40 to 1.46. The lowest fertility rate had the ewes from BDSP from 1.22 to 1.25.
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