The article presents the zootechnical characteristics of the productivity of indigenous Tuvan rough-haired goats and similar data of a new fluff type of goats in the Tuvan population of rough-haired goats.

Here, we present the results of a phylogenetic analysis of sheep of the Kuibyshev breed. Complete mitochondrial genome sequences of Russian sheep breed were obtained and then analyzed considering separate mitochondrial markers. The level of polymorphism in separate mitochondrial markers was established. Genetic diversity indicators were calculated for separate mitochondrial genes and for the complete mitochondrial genome. Based on the analysis, a phylogenetic tree was constructed, and the haplogroup assignment of the studied sheep was determined. Regular genetic monitoring will contribute to the accumulation of knowledge on the polymorphisms of all mitochondrial markers. Our study resulted in gaining new knowledge, which deepen the understanding of the role of mitochondrial DNA in the life functions support of sheep.

The article discusses some aspects of increasing the fertility of sheep by using in the breeding process some genetic factors that are present in the populations of animals of the corresponding breeds.

In the article, the authors raise the problem of the loss of the genetic value of many breeding herds as a result of crossbreeding. Attention is focused on the need to provide breeding categories of farms with qualified livestock breeders, as well as compliance with rationed feeding that meets the status of a breeding animal. It is said about the need to use the methods of resource-saving technology for the production of sheep products, as well as about the surface improvement of the botanical composition of pastures, due to the overseeding of cereal-bean grass mixtures recommended by scientists.

In the conditions of the hot climate of the South of Russia, purebred Texel sheep of Australian breeding by the beginning of the main breeding season in sheep breeding in the North Caucasus zone (end of August, first decade of September) have reduced sexual activity, ejaculate volume and unsatisfactory seed quality, compared with Texel sheep of Finnish breeding and Kuban Lincolns. The reproductive ability of texel sheep of Australian breeding is restored at a later date.

The article provides data on the exterior of sheep of the Edilbaevsky breed at the age of 2, 3, and 4 years. The exterior was studied based on the measurement of linear measurements of the articles of the body.

The article presents data on the creation and development of semi-fi ne sheep breeding in the West Kazakhstan region in the last century, as well as the current state. Considering that natural and climatic conditions are harsh in most areas of the region, and the population’s need for a traditional food product – mutton and crossbred wool is high, there is confidence that the industry will develop. The unique gene pool of the domestic akzhaik sheep breed can be used in the breeding process to improve existing and create new promising breeds and types of sheep.

Rough-haired goats are one of the types of domestic animals bred in Tuva. Goats are common in all natural and climatic zones of the republic. The total number of livestock in the republic is more than 13 thousand heads. Tuva coarsehaired goats are of particular value in the gene pool of agricultural animals of the republic. The paper summarizes the data on the indicators of the exterior, determines the measurements and indices of physique, the dynamics of the live weight of animals and the gains of a new downy type of goats bred in the conditions of the Republic of Tyva.

According to the results of industrial crossing of sheep of the Edilbaevsky breed with sheep of the Dorper breed, the characteristics of slaughter indicators, morphological and varietal composition of carcasses of young animals of the Edilbaevsky (ED) breed and crossbreeds of the Edilbaevskaya- dorper (ED × D) are given.

In a number of farms of the Republic of Tyva, since 2013, in-depth breeding work has been carried out to create a new type of Tuvan aboriginal goats, the distinctive feature of which is the high content of fluffin the wool with a reduced tonin. The article considers the indicators of bouff ant fluff and its tonin in Tuvan goats of different sex and age groups of a new type

The use of a prebiotic feed additive “Diaretin-C” in the diet of sheep from 4 months in the amount of 25 and 45 g per head daily compared to the standard diet helped to increase the average daily increase by 5.2% and 17.8%, respectively. Due to the analysis of experimental data, it was found that in lambs at 8 months, the highest meat content coefficient was achieved in experimental groups in which the feed additive “Diaretin–C” was used – 3.28-3.62 compared with the sheep of the control group – 3.23.

In the scientific and economic experiment, lactating goats of the Saanen breed were fed two types of premix as part of the compound feed. Animals of the control group received a premix, which included sulfate salts of iron, zinc, manganese, copper, cobalt, potassium iodide, sodium selenite; form. It has been established that the use of a complex feed additive at a concentration of 10% of the daily norm of microelements contributes to an increase in milk productivity by 7.4% and a decrease in energy costs per 1 kg of milk by 2.4%.

The article presents the results of biochemical parameters of the cicatricial content of purebred rams and crossbreeds obtained from crossing Kalmyk fat-tailed ewes with Dorper rams.