The correlation of the main qualitative characteristics of wool with the histological structure of the skin

Abstract

A comparative evaluation of the study of the main traits of wool with indicators of the histostructure of the skin of rams has been shown that the fat content in wool averaged 13,1 %. The correlation coefficient between the percentage of pure wool yield and the amount of fat was 0,38. A negative correlation between the amount of wool shorn, the yield of pure fiber, and the length of the wool has been was obtained with the amount of sweat in the wool (P < 0,01). This suggests that the reduction of the sweat part in the fat content will occur to a certain extent due to indirect selection for wool productivity. As the level of the comprehensive evaluation has decreased, the wool thinned by an average of 0,98 microns. The difference in the length of the wool of rams of the 1st group with average indicators was 1,3 cm, and for the amount of wool shorn and the yield of pure fiber –1,18 kg and 7,17 %, respectively. A negative correlation (r = –0,50) has been obtained in rams with the thinness of 23,0–25,0 microns compared to herdmates with 18,0–20,0 microns when studying the correlation between follicle density and the primordial follicle/secondary follicle ratio. The narrower the DPF/DSF ratio the thinner the coat, and vice versa animals with the narrower ratio (0,98) have been characterized by a more balanced fiber. The correlation coefficient between the thinness of wool and the diameter of the secondary fiber was 0,42. With increasing thickness of the skin and especially its pilar layer the hair becomes shorter. Rams with a hair length of 10 cm have 19,2 % thicker skin and 23 % thicker pilar layer. There is a tendency to thicken the skin and pilar layer in rams of the 3rd group. Animals with the total follicle density of 80,0 pcs/mm[sup]2[/sup] or higher have 8,0 % less thickness compared to their herdmates who have 50,0 follicles per mm[sup]2[/sup] . Thus, the significant correlation has been found not only between the traits of fleece and wool, but also indicators of skin histostructure. This confirms the need to evaluate the fleece for the entire range of various properties of wool and skin histogenesis.