The article notes insignifi cant diff erences in the complex of valuable economic and useful characteristics between animals of various categories of breeding and other farms, which does not allow to increase the productivity of sheep on a national scale. One of the reasons for this is that practically in most breeding farms of all categories, diff erent types of crosses are used, and the breeding advantages of crossbreeds are known to be low.

The article presents the dynamics of the breeding stock of Romanov sheep in the Russian Federation and the Yaroslavl region for the period from 01.01.2010 to 01.01.2022. The characteristics of productive traits and reproductive qualities are given, the main directions of breeding work of the breeding center (association) of Romanov sheep are indicated.

The article shows the stages of the creative path of the scientist breeder A.N. Ulianov and his school for the creation of types and breeds of meat-wool and meat productivity directions.

Data are given on the new principles of selection in sheep breeding, the importance of evaluating rams and ewes in terms of the quality of their off spring, and the use of new techniques when creating the Solnechny type in the Tsigai breed of sheep.

The paper analyzes data on the fertility of sheep of the southern meat breed, studies the correlation between the fertility of the uterus and the indicators of the live weight of its lambs at weaning. The period under review covered 5 lambs. It shows a gradual increase in reproductive indicators by 3-4 lambs and their subsequent decrease associated with the extinction of fertility at an older age. The uterus, stably producing off spring capable of rapid weight gain, as well as uterus with high fertility, which can be used to preserve the valuable gene pool of the breed, have been identified.

The paper presents the main indicators of the slaughter of rams of the Caucasian breed. The characteristics of the morphological and varietal composition of the meat of young sheep from diff erent habitats of the Saratov region with the same growing technology are given.

The paper presents the results of studying the meat qualities of the Volgograd breed of sheep, depending on age.

The article presents the indicators of slaughter, morphological and varietal composition of carcasses, chemical composition of meat of Caucasian sheep born as infants and twins at the age of 4 and 6 months.

The article presents the results of slaughter, morphology of carcasses, chemical composition and biological value (BCP) of meat proteins of Caucasian sheep and crossbreeds Caucasian × Dzhalginsky merino.

The article presents the dynamics of live weight, the results of slaughter and morphological composition of carcasses of young sheep of Stavropol breed of diff erent ages in the conditions of the harsh continental climate of the Southern Urals.

The article presents the results of a study of milk productivity, biochemical parameters, qualitative composition, nutritional value of milk of Zaanen and Nubian goat breeds for 305 days of 1 and 3 lactations.

The results of studying the meat productivity and quality of lamb of young sheep of the Volgograd breed during fattening with the use of the selenium-containing preparation DAFS-25 and a combined mineral additive: the preparation DAFS-25 together with sulfur for animal husbandry in the diets are presented. It was found that the sheep had higher slaughter rates and meat qualities when introducing feed additives into the diet of the subjects, with a better result when using a combined additive.

The article presents the results of the introduction of a new probiotic feed additive “Enervit” into the diet in order to establish its eff ect on milk productivity, the chemical composition of milk and the increments of Dagestan mountain sheep. Probiotic feed Additive (PKD) “Enervit” is a phytobiotic with a carbohydrate-protein complex, pro- and prebiotics. “Enervit” – aff ects scar microorganisms by stimulating the digestion of fi ber. The presence of available proteins in the composition of the drug signifi cantly improves carbohydrate and protein metabolism, active synthesis of microbial protein. MPC “Enervit” increases the milk content of sheep, fat content and average daily gains in rams.

The article provides a comparative assessment of moderate (traditional) and intensive types of feeding of Volgograd breed sheep. The superiority of sheep of intensive type of feeding over moderate type in terms of live weight, slaughter indicators and profi tability of lamb production has been established.

The results of the study of nitrogen metabolism in the body of fattened rams are presented when using organoselenium preparation DAFS-25 and a combined feed additive in diets: preparation DAFS-25 in combination with sulfur for animal husbandry. Use of these feed additives in diets had a positive eff ect on the level of exchange and absorption of nitrogen in young sheep and weight growth, with the best result when using a combined additive.

The article presents the results of the introduction of a new probiotic feed additive “Enervit” into the diet in order to determine the hematological parameters of Dagestan rams. Feeding rations for rams are compiled according to the recommended standards of the Russian Academy of Agricultural Sciences. The composition of the main rations included cereal-forb pasture, cereal-forb hay, barley turf, a complex of mineral supplements in an amount that compensated for their lack to the recommended norms. The basic diet was the same for all groups and diff ered in the level of Enervit PKD introduced into the diet.

On sheep with chronic rumen fi stula, the physiological eff ect of brown algae – fucus was studied. It was established that the dynamics of ruminal digestion indicators was the best in the animals of the experimental group. A tendency to improve the digestibility of nutrients in the diet was revealed.

The article is devoted to one of the exotic diseases for the Russian Federation – contagious pleuropneumonia of goats. The aim of our research was to study the epizootological manifestation and clinical course of contagious pleuropneumonia of goats according to researchers. The materials of the bulletins of the Information and Analytical Center of the Department of Veterinary Supervision of the Russian Academy of Veterinary Sciences (FGBI “VNIIZH”), as well as data from scientifi c publications on this problem were used.