Live weight and exterior characteristics of lambs obtained from inbreeding F2 hybrid sheep of Hisar and native breeds

Research Institute of Livestock and Poultry Farming, Tashkent, 100034, Uzbekistan

^* Corresponding author: kh.berdiyeva1001@mail.com

Abstract

In this article, live weight and body size parameters of hybrid lambs obtained from inbreeding of F2 hybrid sheep with Hisar and native breed genotypes were higher than those of pure native breed lambs. These obtained results showed that improvement of selection traits of native breed sheep using Hisar breed rams is of great scientific and practical value. The live weight of the hybrid rams obtained from inbreeding was 5.62 kg at birth, and the females were 5.17 kg, respectively. In group I, the live weight was 0.45 kg, or 8.7%, and 0.34 kg, or 7.2% higher than the live weight of purebred heifers. However, the average live weight of experimental hybrid lambs at birth was 5.37 kg. It was found that the average live weight of pure native lambs was 0.41 kg or 8.3% higher. It should be noted that in experimental group II, at the age of 12 months, crossbred lambs were higher in body size than pure native lambs. In this case, hybrid frames in experimental group II compared to those of equal frames in control group I, respectively, 1.46 cm or 2.07%; 2.4 cm or 3.43%; 0.61 cm or 0.97%; 0.35 cm or 2.15%; 0.45 cm or 2.16%; 1.2 cm or 1.51% and can be seen to be 0.03 cm higher.