Productive traits of sheep of different genotypes

Abstract

The effect of industrial crossbreeding on the productive qualities of purebred Tsigai and Romanov sheep breeds was investigated. The following indicators were studied: the survival of the young for the period from birth to their weaning; dynamics of live weight of sheep and goats in the corresponding age periods (at birth, at 2-, 4-, 6,5-month age); meat productivity; wool productivity and sheepskin quality. The lambs and suckers were found to have live weight at birth of 3.9 and 4.2 kg respectively, which is 8.3 and 7.6 % higher than in purebred lambs. The difference in live weight of local and purebred lambs is statistically significant (P>0,999).The average daily growth for the whole period in the local sheep was 192 g, in the fossa 171 g, which is 4.3 and 4.9 % respectively more than in purebred peers. It is proved that the local young is characterized by better viability: the preservation of lambs to beating was 132.2 % against 115.3 % in purebreds. It was studied that the mass of chilled carcass in purebred lambs was 14.14 kg, and in domestic 14.3% more (P>0,999). It was investigated that animals in the experimental group had an average of 12.49 kg of flesh in the carcass, which is 77.3 % by weight of the carcass. In purebred lambs these figures are respectively 10.52 kg or 74.4 %. The difference in the pulp mass between the carcasses of the study groups was 1.97 kg or 18.7% (P>0.999). The fat content of the mixture was superior to pure-bred animals, resulting in a higher calorie content of 8.34 %. Proven lambs during fattening were shown to have a greater increase in live weight compared to purebred by 13.6%. At the same time, they consumed less feed units by 4.7 %. In terms of the original dirty wool, the highest indices were in the local brightnesses. Along with this, they also outperformed purebred animals by 2.48 kg, or 10.7%. It should be noted that in Romanov sheep, as a rule, fluff is exaggerated. This trend is preserved in the received mixes. The difference in the length of the down and the bones was 32.2 % (P>0,999). It is noted that the area of sheep sheep of the experimental group was more control by 7.4 % (P>0.95) and amounted to 84.0 dm2. The same pattern was observed in the area of exposed sheepskin. Key words: wool, lamb, sheepskin, live weight, viability, lambs, Romanov breed, Tsigai breed.