Exterior-productive indicators of Stavropol breed sheep aged 13–14 months with inbreeding selection

Abstract

The article presents researches of intra-breed selection of sheep of the Stavropol breed of the Volga region in order to improve productive qualities.The experiment was carried out in CJSC "New Life" of the Novouzensky district of the Saratov region. The research material is purebred sheep of the Stavropol breed. The studied offspring were formed: group I — from queens of the strong type, II — from queens of the tender type, III — from queens of the loose type. The evaluation of the experimental young was carried out at the age of 13–14 months. When assessing the live weight, the advantage of young animals «loose x strong» type over «tender x strong» was 11.93%, over animals «strong x strong» — 3.58%. Group I outperformed group II by 8.06%. In terms of wool shearing, sheep of group I outperformed young animals of II and III by 9.61% and 5.04%, animals of group III prevailed over II by 4.34%. According to the exterior, the descendants of the combination «loose x strong» type surpassed «strong x strong», «gentle x strong» in chest width by 12.9% and 23.16%, in chest circumference by 11.45% and 17.54%, the young «strong x strong» prevailed over «gentle x strong» in chest width by 9%, chest circumference by 5.45%. According to the downed sheep compatibility index, «loose x strong» outperformed «strong x strong», «tender x strong» by 11.38% and 11.88%. The large breast index was distinguished by the animal combinations «loose x strong» in comparison with the analogues «strong x strong», «gentle x strong» by 3.47% and 3.95%. When using intrabreed selection of sheep of the Stavropol breed, the young of combinations of parent pairs of different constitutionally productive types have well inherited the exterior and productive features of the parent individuals, which is an important factor in conducting breeding work.