LEVEL OF REPRODUCTIVE CAPACITY OF EWES OF ROMANOV BREED DEPENDING ON GENOTYPE

Keywords: reproductive capacity, fertilization, preservation, fertility, Romanov breed, Hissar, crossbreeding

Abstract

In the conditions of the development of the sheep breeding industry, it is important to determine and substantiate the directions for improving the level of productive characteristics, including those related to increasing the efficiency of obtaining lamb and other additional products. The article presents the results of the study of factors affecting the fertility of sheep as an integral indicator of reproductive capacity. It is indicated that, despite the high genetic conditioning of this complex biological trait and its conservatism, the fertility of sheep depends on the breed, age, time of mating and onset of estrus, as well as conditions of feeding, keeping, etc. The level of reproductive ability of Romanov ewes of the first and third lambing was studied both during purebred breeding and when crossing with breeding rams of the Hissar breed. With purebred breeding, the fertility of ewes of the first lambing was 94.0%, and 98.0% of the third lambing. 31.9% more lambs were obtained from dams of the third calving compared to the number of young lambs from dams of the first calving. The share of first-lamb ewes that had one lamb was 53.2%, and 46.8% of multi-lamb ewes, respectively. 14.3% of low-fertile ewes had 1 lamb at lambing, while 53.2% had multiple lambs. The preservation of lambs before weaning was 94.2–94.5% depending on the age of the ewes. At the same time, the multifertility of ewes of the third calving was 185.7% against 146.8%, respectively, of ewes of the first calving. Fertility of Romanov ewes of the third lambing in purebred breeding (185.7 heads), and in crossing them with rams of the Hissar breed – 162.5% (- 23.2%). The number of low-fertile ewes is 37.5%, and multi-fertile ewes are 62.5%. The conservation rate of local young is 96.1% against 94.5% of purebred peers. In this way, it is possible to detect the dependence between the age of multiparous Romanov ewes and indicators of their reproductive capacity and to conclude that the value gradually increases with age. The use of ewes of the Romanov breed during industrial crossing with breeding rams of the Hissar breed somewhat reduces the level of their reproductive capacity with good preservation of the young.

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Published
2023-04-20
How to Cite
MykolaіchukL. P. (2023). LEVEL OF REPRODUCTIVE CAPACITY OF EWES OF ROMANOV BREED DEPENDING ON GENOTYPE. Bulletin of Sumy National Agrarian University. The Series: Livestock, (1), 32-37. https://doi.org/10.32782/bsnau.lvst.2023.1.5