The article presents research in a comparative aspect on the study of the characteristics of growth, development and formation of meat productivity of rams of the original 
and new types of the Kalmyk fat-tailed breed

The article analyzes the indicators of variability, repeatability and heritability of the average daily milk yield of Saanen goats in a particular farm. It is shown that goats obtained from different sires of Austrian selection could be distinguished both in terms of the value of the definition and the value of these indicators. The dynamics of indicators studied was also established depending on the period of lactation.

The results of the study of the exterior features of complex hybrids and their purebred peers are presented. Purebred katadins surpass their Romanov counterparts in live weight at 6 days of age by 1.49 kg (37.7%), at 42 days of age by 3.28 kg (35.6%), complex hybrids in argali by 1.32 kg (32%) and 3.16 kg (33.9%) (p < 0.05), respectively.

The article presents the results of assessing the level of multiple pregnancy and its relationship with milk  productivity in goats of diff erent ages of the Nubian breed in breeding conditions in the Leningrad region

The results of studies on determining the reproductive capacity and gestation period of Etti merino ewes in purebred breeding (EM × EM) and two-breed crossing of Etti merino ewes with Dohne and Australian meat merino rams in the conditions of the foothill zone of Kazakhstan are presented.

3 goats aged 7 months were selected. From the bright 18 months. Three groups of 15 heads each were formed. In the case campaign, these bright ones happen to experimental goats. The results of the study showed that the test of breeding qualities of goats with an assessment of their off spring in 4 months. This age makes it possible to identify improvers earlier and thereby reduce the cost of maintaining goats that are neutral or degraders, and most importantly, improve the quality of off spring obtained from goat improvers.

The study of the slaughter indicators of Romanov rams and crossbred sheep (¼ Romanov × ¾ Ile de France) showed that the crossbreeds significantly surpass Romanov peers in all slaughter indicators

The article presents the indicators of meat productivity of sheep of the Edilbaevsky breed when sold for meat in the year of their birth, taking into account the size of the fat tail.

The article presents the results of crossing Romanov sheep with Edilbaev sheep in the production of young mutton. It was found that due to the effect of crossing, the crossbreeds of the first generation (½ Romanovskaya × ½ edilbai) and the second generation (¼ Romanovskaya × ¾ edilbai) were distinguished by a higher yield of the edible part of the carcass, the meat content coefficient, the yield of carcass pulp per 1 kg of pre-slaughter live weight, a better ratio of edible and inedible parts and a muscle-fat ratio in compared with purebred youngsters of the Romanov breed.

The article provides data on milk productivity in the age dynamics of sheep meat breeds: Etti merino, Dohne and Australian meat merino in the conditions of the foothill zone of the South-East of Kazakhstan.

As a result of the study, it was found that the average milk yield for 4 month of lactation of experimental sheep was: Etti merino – 156,4 kg; Dohne – 153,1 kg and AUMM – 150,4 kg.

The research was carried out in a herd of the Saryarka fat-tailed coarse-wooled sheep breed, where rams of the Edilbay breed were used on the second class ewes, and in a herd of the Kazakh fat-tailed semi-coarse-wooled sheep breed, where rams of the Saryarka fat-tailed coarse-wooled breed were used on the second class ewes. The level and dynamics of live weight were studied in the resulting off spring for the suckling period and up to 16 (rams) and 18 (ewes) months of age.

In terms of live weight for all studied age periods, the superiority was observed in crossbred lambs and young animals, it was 4.0-4.2% in E × SFC-S hybrids at birth (rams-ewes), while slaughtering 7.5-5, 1% (P > 0.999), at 16 months (rams) – 14.0% (P > 0.999) and at 18 months (ewes) – 6.5% (P > 0.999); for hybrids SFC-S × KFS-K – 4.2-4.3%; 7.1-6.3% (P > 0.999); 6.1% (P > 0.999) and 6.9% (0.999), respectively.

Crossbred lambs and young animals grew and developed more intensively, their average daily gain in the suckling period for the rams of E × SFC-S variant was 280 g and for SFC-S × KFS-K variant – 260 g versus 259 and 242 g in purebred peers, respectively. These indicators for ewes were 251, 241 and 238, 226 g, respectively. The average daily gain in live weight of rams in the period from slaughtering to 16 months of age was 75 g in the E × SFC-S variant, and in the SFC-S × KPG-K variant – 60 g versus 60 and 57 g, respectively, in their purebred peers. In the ewes group, these indicators were 45, 40 and 40.37 g, respectively.

While slaughtering at four months of age, the slaughter yield in the E × SFC-S variant was 52.8%, in the SFC-S × KFS-K variant – 52.3% versus 52.1 and 51.6% respectively in the control variants. The pulp yield was also higher in crossbred rams than in their peers from the control groups – 80.2-79.3 and 79.1-79.2%, respectively. Similar results were obtained during the slaughter of crossbred and pure-bred rams of the above-menthioned groups at 16 months of age.

The article shows that when crossing crossbred animals of various origins had an intermediate nature of inheritance of the main indicators of wool productivity. The young, obtained from the use of queens of the Salsk breed with Dzhalginsky merinos, had higher cuts of pure wool with its lowest toning. The daughters of the Salsk breed and Russian meat merinos were characterized by a smaller shearing of wool with a large cross-sectional diameter of the wool fiber, at the same time they slightly exceeded the off spring of the Dzhalginsky merinos in the yield of pure wool.

The results of measuring the fi bre diameter of the wool of the main rams of 8 pedigree farms of the Republic of Kalmykia are presented, the samples taken from 389 main rams of Grozny, Stavropol and Chernozemel Merino breeds. The samples were carried out in the laboratory for testing and certification of wool belonging to the All Russian Research Institute of Animal Breeding. The variability of fibre diameter and wool equal between farm herds and breeds of sheep has been established.

The article presents the indicators of fi ne wool shearing and its physico-mechanical properties in bright Dagestan rock and crossbreeds of peers obtained by crossing queens of Dagestan rock with sheep of Russian meat merino.

The structure and chemical composition of sheep wool fiber and flax fiber of the Universal variety were determined, the quality of the fiber surface was assessed by electron microscopy and near infrared spectroscopy. The wool of the Grozny breed of sheep differs in surface quality and chemical composition from flax fiber. Qualitative differences are manifested in the different elemental composition of fibers, both in metals: Na, K, Ca, Mg, Al, Fe, and in non-metals: C, O, S, Si, Cl, P. In flax fiber, the cellulose content is 76-79% calculated by spectrum and chemical analysis on absolutely dry matter. For wool fiber and suitability for the textile industry, data on fat and protein content are important. The results on the content of chemical elements also indicate the possibility of uniquely distinguishing different types of fibers. Significant differences in concentrations are observed for oxygen, sulfur, silicon, potassium, chlorine, iron, calcium, and phosphorus. Wool is characterized by a high concentration of sulfur compared to flax fiber, and a minimum concentration of phosphorus. The presence of iron is not noted in the flax fiber.

The article considers a variant of crossing the Grozny sheep breed with the Stavropol one, which provided the off spring with an increase in wool productivity, improvement of technological, physico-chemical properties of wool while maintaining the animals’ adaptability to arid conditions.

The results of using a premix based on the flask of the Balasheyskoye deposit are presented. Their influence on the level of milk productivity and milk quality indicators,  the digestibility and use of nutrients in the diet, the biochemical status of blood has been studied. The inclusion of the developed premix in the compound feed increases milk productivity by 9.2%.