Topographic features of sheep skin and coat structure
Journal of Livestock Science
In the case of insufficient attention of the breeder to sheep selection according to wool uniformity, a fairly large group of animals with wool unequal in length and fineness within the staple and along the fleece appears in the herd. The breeder's excessive enthusiasm for wool uniformity in the fleece leads to the weakening of the sheep's body composition and decreased vigor. The Republic of North Ossetia-Alania, research was carried out in 2019-2020. The geographic location of the farm:
... rn latitude: 43.175598. Eastern longitude: 44.295621 and 412 meters above sea level. For the experiment, 10 fine-wooled mongrel winter lambing double-toothed gimmers were selected according to the principle of pairs-analogs. In the spring before shearing, samples of wool and skin on the upper part of the neck, shoulder, back, rump, thigh, flank, shoulder blade, and belly were taken from 14-month-old test double-toothed gimmers. Based on the studies carried out, one can make the following conclusions: -despite the wool homogeneity in the fleece, within different topographic areas, sheep skin has an unequal thickness and structure, which largely determines the coat quality; -the thickest skin in the test sheep was found along the back line. From the back to the flanks, the thickness of the skin decreases. The thinnest skin was on the belly; -on thicker skin, a longer and thicker coat grows, on thinner skin, a shorter and thinner coat grows; -with a change in the wool fiber density, the epidermis thickness changes. The thicker the coat, the thinner the epidermis, the thicker the epidermis, the more scanty the coat; -within different skin topographic areas, the PFs (primary follicles) and SFs (secondary follicles) depth and the ratio of these values are different, which affects the evenness of wool equal in length and untrue wool. The rump, neck, shoulder, and thigh had the maximal PF/SF depth ratio. The same topographic areas were characterized by lesser wool uniformity in length and fineness.