DISTINCTIVE FEATURES OF THE DEVELOPMENT OF THE THICKNESS OF THE SKIN AND ITS WORDS IN ROUGH-HAIRED SHEEP WITH AGE

Abstract

Very specific requirements are imposed on the coat of sheep of the Romanov breed, which are associated with the structure of the skin, in addition, the study of the age characteristics of the structure of the skin gives us additional data on the adaptive characteristics of animals in new breeding conditions, and in our case, in the conditions of the foothill zone of the North Caucasus. Life-time observations carried out on the same animals open up the possibility of understanding the properties of the skin in connection with changes in the body under the influence of the environment. Purpose - to study postembryonic changes in the skin of young sheep of the Romanov, Tushin and Ossetian breeds in the first year of their life. To achieve this goal, three groups of bright breeds - Romanov, Tushin and Ossetian breeds - were formed in JSC "Saniba" of the Prigorodny District of North Ossetia-Alania. The test subjects were weighed at birth and at 4, 8 and 12 months of age, and skin samples were taken at the same ages for examination. The preparation of skin preparations and their study was carried out according to the method of N.A. Diomidova and others. It was found that Ossetian lambs in live weight both at birth and at subsequent ages significantly exceeded the Romanov peers. The Romanovs' brighta at the age of 12 months surpassed the Ossetian and Tushin peers in the thickness of the pilar layer by 17.3 and 28.7%, respectively, and in the total thickness of the skin - by 6.6 and 14.4%, yielding to them in the thickness of the epidermal layer by 5 , 1 and 10.6%, and in terms of the thickness of the reticular layer - Tushino by 10.1%, Ossetian - 13.5%. Calculations showed that the Romanovs' brighta in the relative thickness of the pilar layer are superior to the Tushino and Ossetian peers, yielding to them in terms of a similar indicator of the epidermis and the reticular layer.