The article considers the weight growth of sheep and eggs of the Gorky breed of sheep at birth, at weaning (4 months), at 6, 7 and 8.5 months; linear dimensions (body stats) were evaluated in sheep producers, and hematological blood parameters in lambs.

The problem of preserving, improving, and rational use of the gene pool of domestic breeds of farm animals, including sheep, is always relevant. To date, the priority in solving the problems of intensification of the sheep and goat breeding industry is the introduction of modern methods of genetic diagnostics – the identification and identification of marker genes of economically valuable traits. This article presents the results of studies of the relationship of productivity traits in the population of sheep breeds мanych merino with the alel state of the genes of growth hormone (GH), differential growth factor (GDF9).

The article presents data on the features of polymorphism of the CAST, GH and GF 9 genes in Kalmyk sheep of the short‑tailed breed and crossbreeds with a bloodline of 1 Kalmyk short‑tailed + 1 dorper. The polymorphism of the GDF9 gene in the Kalmyk chicken breed is represented by GDF9A alleles with a low frequency of occurrence (0.17) and with a high frequency of occurrence (0.83) GDF9G. In the identified polymorphism of crossbred animals (½ Kalmyk fat‑tailed + ½ dorper), the G allele for the GDF9 gene is the most common, the frequency of occurrence of which was 0.74. Heterozygous AG genotype was common in the studied sheep population (52.9%). The obtained results of the study and their analysis indicate the diversity of the distribution of the allele profile in the loci of the studied genes.

The article presents the results of studying the weight and linear growth of lambs of the southern meat breed and cross‑breed peers (½ southern meat × ½ Katum). The results of the study showed that the crossbreeds of the first generation surpassed their purebred peers in weight growth (live weight) at birth by 6,02%, and at 6 months of age by 15,1%.

The article examines the state of sheep breeding in the Russian Federation for 2021‑2022. The evaluation of official statistical data provided by the Federal State Statistics Service in open access has been carried out. Based on the assessment obtained, trends and patterns are identified, as well as the main problems that hinder the effective development of sheep breeding in the Russian Federation are formulated and ways to solve them are presented.

The article presents experimental data on quan‑ titative and qualitative indicators of meat productivity of young sheep of the Gorky breed, depending on slaughter at the age of 6, 7 and 8.5 months: live and slaughter weight, carcass weight and yield, slaughter yield, chemical and amino acid composition of meat, protein‑quality indicator (BCP)

In the article under consideration, an assessment of meat productivity and the biological value of the meat of local Tuvan goats is given. The object of research were local Tuvan goats at 8, 12, 18 months of age. Upon reaching this age, a control slaughter of goats was carried out, as well as carcass cutting in accordance with GOST 31777 ‑ 2012. It was established that at the age of 18 months the carcasses of goats were full‑fleshed with a fairly high content of muscle and adipose tissue, and the meat was characterized by high biological value.

The article presents the indicators of slaughter and morphological composition of carcasses of sheep of the Edilbaevsky breed at the age of 5 months, obtained from class I and elite ewes and from class II ewes.

The article evaluates the meat productivity and digestibility of feed by Romanov and Kuibyshev sheep breeds and their crossbreeds with Ile‑de‑France rams.

Data on the study of the chemical composition of mutton meat of young purebred Romanov sheep and their crossbreeds with the Edilbaev breed are presented. Studies have established that intergroup differences in the content of individual nutrients led to unequal energy value of the meat products obtained.

The selection and genetic parameters of wool productivity of Kazakh Bactrian camels (Camelus Bactrianus) have been determined. The coefficient of shearing of wool is 1.40 for breeding camels older than 7 years, 1.09 for camels, 1.25 for repair males (4‑5 years), 1.05 for repair females (3‑4 years). The coefficient of heritability of shearing of wool in linear camels is 0.35‑0.42, non‑linear 0.22. The coefficient of heritability of length and tone of wool is 0.44 for camels of linear origin‑0.46 and 0.42‑0.47, non‑linear origin 0.31 and 0.38. The coefficient of repeatability of wool shearing is 0.48‑0.75 for Kazakh Bactrian camels of the Temir Bura line, 0.52‑0.81 for Aport bura, and 0.35‑0.69 for non‑linear camels. The obtained values turned out to be highly statistically reliable at P < 0.01‑0.001. The coefficient of genetic correlation between wool shearing and live weight is 0.446‑0.654, wool shearing and wool length 0.493‑0.742, wool shearing and toned wool 0.517‑0.689, the length of wool and toned wool is 0.571‑0.789.

The article is devoted to the analysis of microphotographs of felts of different fibrous composition, it presents the results of the analysis of wool felt fibers for the upper of shoes. The results of the analysis allowed us to estimate the amount of free space not filled with fibers. The practical significance of studying the porosity of shoe fibrous materials is determined.

The article provides an assessment of the different systems of keeping Hissar sheep that have developed in the farms of Tajikistan in recent years.

The first system is the year–round pasture keeping of Hissar sheep in winter and early spring periods on valley and foothill pastures, and in summer and early autumn – in the mountains on alpine and subalpine pastures.

The second system is the pasture keeping of Hissar sheep only in summer and early autumn in the mountains, and in other periods – stable and semi–stable keeping. Pasture maintenance is practically absent.

The third system is the year–round stable or semi‑stable keeping of Hissar sheep.

The article classifies the types of feed additives used in animal feed and the types of feed additives on the Russian market, many of which have a beneficial effect on livestock products, on the physiological state of animals, in particular by influencing the gastrointestinal microflora and digestibility of f

The article provides an analysis of marketing research on the domestic market of feed additives, which serves as an informational orientation map that identifies competitors in this market. Recently, due to sanctions, many foreign companies for the production of feed additives registered in Russia have left the Russian market of feed additives for livestock, which has created favorable conditions for the implementation of import substitution plans.

The histological studies results of the longissimus dorsi muscle structure in interspecific hybrids of domestic sheep with mouflon are presented in a comparative aspect with the original parental form – purebred sheep of the Romanov breed.