To increase the production of mutton, it is necessary to improve the genetic resources of sheep with precocity and high meat productivity. In this regard, the meat breed Dorper has gained its popularity, which has good meat qualities. The aim of this paper is to study the hematological parameters in the blood of the Kalmyk fat-tailed breed and hybrids (1/2 Kalmyk fat-tailed × ½ dorper). The work was carried out in LLC “Agrofirma Aduchi”, the Republic of Kalmykia in 2017. It is established that hybrids have a high content of hemoglobin, leukocytes, erythrocytes in the blood, which indicates the activation of redox processes in the body, and confirms their higher growth rates during cultivation. The content of total protein in the blood serum increased with age and was within the physiological norm. At 4 months of age, in the serum of lambs of group II, there was more total protein by 4.86 g/l (7.39%) (P > 0.95), and at 8 months of age – by 5.16 g/l (7.74%) (P > 0.99), than in peers of the control group. Crossbred calves were significantly superior to purebred animals also in blood serum, albumin, activity of aspartate aminotransferase, alanine aminotransferase and alkaline phosphatase. The activation of metabolic processes in the body of local sheep contributed to a high energy of growth in comparison with purebred peers of Kalmyk fat-tailed breed.
The research explores the qualitative parameters of sheepskin and histological structure of Kalmyk lambs skin and cross breeds obtained when crossing Kalmyklambs and Dorper sheepskinned lambs. Scientific and production experience was conducted at “Agrofirma Aduciya” enterprise in the Republicof Kalmykiain 2018. The authors explored sheepskin commodity properties at the histological level was conducted on the lambs after fattening at the age of 6 months. According to the area of sheep skin, the crossbred lambs of the 2nd (experimental) group surpassed the lambs od the 1st (control) group by 11.08 dm2 (or 11.8%). This difference is explained by higher fattening qualities of the weighed young stock, which have shorter length and wider width of sheepskin. This is explained by the blackness of the animal’s body after fattening. The lambs of the control group had more developed epidermis, a reticular layer and a larger skin thickness, which is characteristic of rough-wool sheep breeds. The lambs of the experimental group have more developed pilar layer, which is typical for the cattle with semi-fine and thin woolen assortments. The density of wool follicles in the crossbred lambs was 3.3% higher in comparison with the control group lambs; the density index (the ratio of secondary to primary follicles) was 12.7% higher. The lambs of the control group have 44th quality wool (39.65 mkm), it has down, crossing hair, beard hair, i.e. rough wool; the crossing lambs of the experimental group have 56th quality wool (29.25 µm), i.e. semi-fine wool. The sheepskin products with softer pile will cost higher.
They have been studied the commercial properties of sheepskins and the histological structure of the Kalmyk breed young rams skin and crossbreds (1/2 Kalmyk fat-rumped breed × 1/2 Dorper). It was found out that the weight of fresh sheepskins in the sheep young of the 1st group was larger than that in herd mates of the 2nd group by 1.0 kg, or 34.5% (P> 0.999). A large live weight influenced the large area of the skin in the second group of young animals, and the length of the wool in the experimental group, which turned out to be shorter, influenced its smaller sheepskin weight. The crossed animals got on the basis of the crossing of the Kalmyk fat-rumped ewes with the Dorper breed rams have the best quality indices of sheepskins and the best histological structure of the skin. In hybrid animals, a more elastic, firmer and less thick skin is 14.52%, due to a greater epidermal thickness of 27.7% and a denser reticular layer of 13.7%. The wool cover (ratio SF / PF) in crossbred young rams is 10.47% thicker in comparison with herd mates, at white color of wool, which corresponds to the technological requirements for the production of high-quality sheepskins.
The meat qualities of rams of Kalmyk fat tail breed and crossbreeds (1/2 Kalmyk fat tail fat + 1/2 Dorper) in rapid fattening were studied. It has been established that cross-breeding young animals bred by crossing sheep of the Kalmyk fat tail breed with sheep of the Dorper breed have increased growth energy and are significantly higher than purebred peers of the Kalmyk fat tail breed. The live weight of crossbones (1/2 Kalmyk fat tail + 1/2 Dorper) was 6.19 kg more at the age of four months, 11.18 kg more at the age of six months than that of purebred peers. Cross-breeding animals had higher indices of elongation, pectorality, and massiveness, while pure-bred animals of the Kalmyk breed were characterized by higher indices of long-legged and overgrown. The cross-cut rams had high slaughter and meat qualities. After fattening, they significantly exceeded the purebred peers in terms of pre-slaughter live weight by 11.07 kg, by weight of chilled carcass by 5.37 kg, by slaughter weight by 5.18 kg, and by weight of pulp in the carcass by 4.86 kg and by the area of the “muscle eye” - by 3.54 cm2. The young meat products were of high quality. The mass of cuts of the first grade in absolute and relative terms is greater in the carcasses of crossbred rams.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.