Background: Studies were carried out on two breeds of pigs - Pietrain (P), and Kemerovo (K), contrasting in composition of carcasses, and their hybrids. Objective: The purpose of this work was to establish the characteristics of the composition of lipids of intramuscular fat (IMF), back fat and serum, organoleptic qualities in animals of these breeds. Methods: Animals of 10 individuals in each group were fed on a standard feed and slaughtered with a live weight of 95-100 kg. The quality of carcasses, the biochemical characteristics of blood, the composition of fatty acids and cholesterol in meat and fat, and blood lipid peroxidation were determined. Results: Thickness on the back fat (BF) at the level of 6-7 thoracic vertebrae with a live weight of 100 kg was 35.8 ± 1.65 mm in pigs of breed K, in hybrids - 27.6 ± 1.06, and in breed P - 19, 6 ± 1.43 mm. IMF in pigs of breed K was almost 4.5 times greater than that of breed P. IMF K breed contained 2 times less cholesterol than in P (2.34 vs. 4.68%). In the IMF, K was 2 times less polyunsaturated fatty acids (PUFA), than P, 7.82 and 15.22%, linoleic acid, 6.74% and 12.42% respectively (p <0.005).The organoleptic properties of meat and salted back fat were significantly higher in breed K (P = 0.05). Conclusion: The data obtained allow us to establish priorities in the use of products of specific breeds of pigs, depending on medical requirements.

The results of research on the quality of carcasses, chemical composition, physical and chemical parameters and tasting evaluation of the meat of pigs of the new sapphire genotype (SG) and animals of different hybrid combinations obtained from crossing a large white breed with boars of meat breeds: Yorkshire, Landrace (L), pietren (P) and Duroc (D) -at different intensity of fattening in the conditions of industrial technology. The thickness of the fat on the ridge in all groups at a moderate intensity of fattening was almost the same-22.1–25.4 mm, at a low intensity of fattening-25.1–28.0 mm, ie. increased by 2.5–5.4 mm. there Is a tendency to reduce the thickness of fat (1.0–2.9 mm) in purebred animals SG compared with hybrids. The area of the muscular eye was the highest in purebred pigs SG-51.7 cm2 and in crossbreeds (KB x y) x L-51.6 against 40.2–40.9 in crossbreeds (KB x y) x D and [(KB x Y) x L] x D, where the final breed was Duroc. In terms of intramuscular fat content and BCP, the best animals were SG, SG x p and (CB x y) x D, in terms of binding capacity- (SG x L) x P (61.3 %, P<0.001) and 4 – breed [(CB x y) x L] x D (60.5 %, P<0.05), organoleptic indicators of meat and broth- (CB x y) x D and [(CB x y) x L] x D. the Animals of these groups were characterized by an increased frequency of bdg genotypes/EDG and EDG/EDG of the e blood system, which can be Accepted as preliminary candidates for genetic markers of meat quality.

Three experiments were carried out to improve the meat productivity of pigs of Large White (LW) breed of russian selection by different variants of crossing with the Yorkshire (Y) breed of canadian selection. There were no significant differences between the groups in terms of reproductive qualities. Two-breed pigs (LW x Y) grew more intensively and the live weight of the piglet at the 30 days was 8,7 kg, which is higher than in the other groups with a significant difference (P <0,05). When the live weight of 100 kg was reached, the вackfat thickness of the fat over 6-7 thoracic vertebrae was 26,3 mm compared to 30,7 mm in purebred pigs of the LW of the breed (P <0,001), the area of the muscular eye was respectively 45,1 cm 2 and 30,6 cm 2 (P <0,001). In the fourth generation of reproductive and absorbent crossing of pigs of LW and Y of breeds, the thickness of the fat on the carcasses of pigs was 21,2 mm (Р < 0.001), which is 30-39 % less than for the LW carcasses, the area of the muscular eye was 44 mm. In three-breed hybrids (LW x D) x L, the age of reaching 100kg was less by 12,5 days (P <0,01), the thickness of the fat was 23,6 mm, that is, it was 11,4 mm less (P < 0,001) in comparison with the control group. The replacement pigs obtained from the absorbent crossing (LW x Y) x Y showed the best results for the вackfat thickness - 19,2 mm, but they were inferior to the purebred Y (13,0 mm) (P <0,001). In the sows of this combination, 11,6 piglets were born alive, the number of piglets at weaning was 10,6, the weight of the nest in the 30-day was 78,7 kg. Differences in the frequency of occurrence of certain antigenic factors of blood in animals of different combinations of breeds are revealed. In animals that have the EAE allele edf, a higher growth rate is revealed, but thicker the backfat.

Background: The studies were carried out on quails, in the feed of which fat of various composition was added. Objective: to establish the effect of adding fat from pigs of different breeds and vegetable oil to quail feed on their growth, productivity and characteristics of lipid metabolism. Methods: chickens of three groups of 60 individuals each were fed with vegetable oil (control) and fat of two pig breeds sharply differing in the chemical composition of fat - Kemerovo (К) and Pietrain (P) up to 23 weeks of age (3.0 - 3.5% of the mass of the diet). At 8 and 23 weeks of age, 10 individuals from each group underwent biochemical blood tests. Results: The fastest growing quails that received fat of breed K. The level of total cholesterol (TC), during the period of the experiment, of the quails significantly decreased, including those receiving vegetable oil - 1.49 times the fat of breed K - 1, 58 times, the fat of breed P - 1.32 times. The atherogenic index (AI) turned out to be significantly higher (P <0.01) in quails fed breed P fat, containing a high level of TC and rich in PUFA (0.93 conventional units versus 0.69 in birds receiving fat of breed K and 0, 57 - in the control group). Conclusion: The obtained data indicate that fat of breed K is more useful for animal nutrition and may be a priority in human nutrition.

The authors presented the results of experimental studies on the stress-resistant of pigs. The first group is a breed created in Sapphire Ltd. This breed is a breeding group (BG) in purebred breeding and their mixtures in two- and three-breed combinations with Landrace (L) and Duroc (D) boars under conditions of industrial farm technology in Siberia. Two methods assessed stress-resistant of piglets of different breed groups. The first method is “weaning crisis”. The second method is a com-parison of cortisol levels in the blood. Three-breed weanling piglets (SGxL)xD turned out to be the most stress-sensitive. Stress-resistant piglets had an effect on their growth during the rearing period. During this period, stress-resistant animals of all breed combinations had higher average daily gain than stress-sensitive animals (P < 0.001). Stress-resistant animals of the breeding group (SG) showed an average daily growth of 547.5 g during the fattening period. Also, the stress-resistant animals of the breeding group reliably surpassed the stress-sensitive pigs by 461.4 g (P < 0.01), the two-breed pigs by 455.9 g and 404.7 g and the three-breed pigs 451.8 g and 419.2 g, respectively. There was a statistically significant advantage in the indices of the average daily gain among the purebred young-sters of the breeding group (SG) (543 g) compared to the two-breed pigs (447g) and the three-breed pigs (402g), i. e., by 17.8 % and 26 % at P < 0.001. The authors found that the EAAcr/- genotype in stress-sensitive pigs was more common than EAA-/(0.71 ± 0.07 vs 0.48 ± 0.09). Stress-resistant pigs of the breeding group (SG) with EAE edg/edf blood group genotypes were characterized by increased growth intensity and reliable superiority over stress-sensitive pigs. The authors believe that these genotypes can be accepted as preliminary candidates for genetic markers of stress resistant. Blood cortisol levels appeared to be unrelated to stress-resistant compared to the “weaning crisis” method. This relationship (blood cortisol level with stress-resistant) applies to all studied breed combinations, both individually and as a whole.