Productive features of rams-breeders with different coat types

The purpose of research is to study economically useful traits of crossbred semi-coarse-haired rams of the desired type in comparison with Tuvan coarse-haired short-fat-tailed sires. The study was completed in 2020-2021 in the base farm Bai-Khol of Erzinsky District of the Republic of Tyva. The objects of study are crossbred semi-coarse-wooled sheep of the desired type and Tuvan coarse-wooled short-fat-tailed sheep. For a comparative assessment of live weight, shearing of unwashed wool and morphological composition of fleece, sheep were randomly selected from a herd of 30 heads of crossbred semi-coarse-wooled and Tuvan coarse-wooled rams. Determination of length, fineness, the ratio of different types of fibers and the presence of dead hair was determined by the method of I.D. Kozlov and Z.V. Speshneva. The obtained data were processed by the method of variation statistics using the MS Excel 2003 computer program. The results of the study showed that the half-coarse-wooled crossbred rams outperform the Tuvan coarse-wooled rams in live weight by 17.1 kg, or 25.6 %. The shearing of unwashed wool in crossbred semi-coarse-wooled rams was 3.48 kg, which is 1.06 kg, or 43.8 %, higher than that of Tuvan coarse-wooled sires (P > 0.009). The down of the desired type was 9.2 cm, which exceeded the length of the down of Tuvan coarse-haired breeders by 2.0 cm, or 27.3 %. The awn is 17.6 cm, which exceeds the same indicator of Tuvan coarse-haired sires by 4.0 cm, or 29.4 %. In the wool of crossbred semi-coarse-wooled rams, the content of the awn is 5.0 % less, and the transitional hair is 7.4% more than in the runes of coarse-wooled breeders. The difference in fineness of down and transitional fibers in rams of the desired type compared to Tuvan coarse-wooled rams is 5.6-14.4 % (P > 0.999). The awn of Tuvan coarse-wooled rams is coarse (83.75 microns) and thicker than the similar fraction in producers of the desired type.