The article presents the stages of development of a universal test system to establish the genotype in the codons of the target fragment of exon 3 of the prion protein (PRNP) gene in domestic goats (Capra hircus). The test system has been tested. The presence of polymorphism in the target fragment of exon 3 of the PRNP gene in domestic goats was revealed. In the 20 goat samples, various allelic variants were identified at codons 37, 40, 122, 142, 143, 146, 154, 211, 222, 240 and 244, respectively. The developed test system will allow us to assess the level of polymorphism in the target fragment of the PRNP gene in domestic goats of various breeds raised in the Russian Federation.

The article presents indicators of meat productivity of rams of different genotypes. It has been shown that purebred Katahdins and their complex crosses with argali, mouflon and Romanov sheep are superior to their purebred Romanov counterparts. In terms of pre-slaughter weight, purebred katadins were 22.51% superior to purebred Romanov rams, hybrids with argali blood were superior to their Romanov counterparts by 9.6%, and with mouflon blood - by 11.4%.

The article examines the current issue of the influence of the calpastatin gene on the meat productivity of Volgograd breed rams. High efficiency has been proven when using the calpastatin CAST genotype in combination with AB.

The article presents the results of a study of the effect of condensed tannins of Larix dahurica and dihydroquercetin on methanogenesis in the body of sheep in vitro. Feeding sheep with tannin supplements (5 g/head per day) and dihydroquercetin (0.1 g/head per day) contributed to a significant reduction in the emission of greenhouse gases in the rumen. A synergistic effect is observed in the complex of tannins with dihydroquercetin.

The article presents a comparative assessment of the dynamics of live weight of goats, depending on age, raised in different climatic zones of the Republic of Tyva, and also provides indicators of absolute, average daily and relative gains. The object of the study is young local Tuvan goats. The obtained primary live weight data served as the basis for calculating absolute live weight by growing period, average daily and relative body weight gain. It was found that during the entire experimental period of research, the growth rate was higher in goats of the central forest-steppe zone compared to their peers in the southern dry-steppe zone.

The article notes that sheep farming, which produces mutton and sheep's milk, makes a certain contribution to improving the food situation in the country.

The article presents the results of a study of the reproductive ability and milk productivity of ewes of the Edilbaev breed. The influence of milk production on the growth of rams is shown. It was established that body measurements characterizing the development of the chest (chest depth, chest width, chest girth behind the shoulder blades) were characterized by the greatest growth intensity, and height measurements (oblique length of the body and metacarpus girth) increased less intensively with age.

The article presents the results of age-related changes in the milk productivity of Nubian goats. The maximum milk yield is typical for full-aged goats - 735.4 kg, which exceeds the indicator of animals of the first lactation by 36.6% (P≤0.001), of the second lactation - by 10.7% (P≤ 0.01), while maintaining high quality characteristics of milk. The correlation coefficient between milk yield and age (lactation number) was +0.87 (P≤0.001).

The article presents a comparative assessment of the meat productivity indicators of rams of different blood, obtained by interbreeding Kalmyk fat-tailed ewes and Dorper × Kalmyk ewes with Charolais breeding rams bred in the conditions of the Republic of Kalmykia.

The work is devoted to analyzing the dynamics of camel breeding development in the Republic of Kazakhstan and the prospects of meat-wool camel breeding development. The object of research is dromedary camels of Arvana breed, Bactrians of Kazakh breed, Kazakh-Kalmyk Bactrians and Kazakh dromedaries bred in Turkestan region of the Republic of Kazakhstan. The coefficient of wool shearing is: in Turkmen dromedaries of Arvan breed 0,65; Kazakh bactrians 1,06; Kazakh-Kalmyk bactrians 0.95; Kazakh dromedaries 0,73. Kazakh bactrians (5,9 kg) are significantly superior to Turkmen Arvan dromedaries (3,6 kg) (p < 0,001), Kazakh dromedaries (4,2 kg) (p < 0,01) and insignificantly superior to Kazakh-Kalmyk bactrians in terms of wool cutting. Kazakh bactrians have the thinnest downy part of the coat (17,4 µm), compared to Turkmen Arvan dromedaries (19,2 µm), Kazakh-Kalmyk bactrians (20,1 µm) and Kazakh dromedaries (18,9 µm). During 1990-2023, the total camel population increased 1.8 times from 143,00 thousand heads to 259,146 thousand heads.

This paper conducts a comparative study of the hair structure of German, East European and Australian shepherds, and also considers the theoretical possibility of introducing dog hair into production based on its characteristics. In the research work, the main indicators were analyzed: fineness, crimp, comfort factor, length and number of fibers.

The work is devoted to the study of the influence of probiotic feed additive “Felutsen” on productive features of Karakul sheep sows. The preparation in the dose of 52,0-62,0 and 48,0-55,0 g/day per 1 head increases meat and wool productivity - by 3,5% and reduces feed costs per unit of production - by 5,4%.

The prevalence and some risk factors for the development of false pregnancy (hydrometra) in Zaanen goats bred on the goat dairy farm of LLC Eco Farm Klimovskaya in the Kaluga region of the Russian Federation were studied. The overall prevalence of pseudopregnancy was 9,31%. The highest incidence of goats with hydrometra was recorded in the autumn months - at the peak of the sexual season among those who gave birth and, especially, those who gave birth again with an average daily milk yield of 2 liters or less.

The peculiarities of the development of the blind, colon and rectum of Romanov lambs aged 1-60 days were revealed. It was found that the length of these intestines in lambs of two months of age was 36.4%, 26.1% and 100.8% compared to the same indicator in sheep of 3-5 years of age used by us as a control. The mass of the same intestines did not change equally and amounted to 27.7%, 17.4% and 30.2%, respectively, for each anatomical structure in relation to the sheep of the control group.