Effects of GH L127V and TG5 C422T polymorphisms on the hormonal profile, slaughter traits, and meat quality of Hereford bulls.

Background And Aim: The creation of objective methods for the evaluation and improvement of quantitative and qualitative indicators of meat productivity in farm animals should be based on a comprehensive analysis of the genetic, physiological, and biochemical parameters of the animal. This study aimed to investigate the effects of growth hormone (GH) and thyroglobulin (TG5) gene polymorphisms on the hormonal status, slaughter traits, and chemical, amino acid, and fatty acid composition of meat in Hereford bulls.

Materials And Methods: Hereford bulls (n = 9) were reared under the same feeding and housing conditions until the age of 21 months, after which they were slaughtered.

Effect of IGF-1 C472T, GH C2141G, and GHR T914A polymorphisms on growth performance and feed efficiency in young Kazakh white-headed cattle.

Background And Aim: Improving the feed efficiency of beef cattle is necessary to increase the profitability of meat production. Implementing marker-assisted selection breeding systems can improve the genetic potential of beef cattle for increased productivity. This research aimed to study the effects of insulin-like growth factor (IGF)-1 C472T, growth hormone (GH) C2141G, and GH receptor (GHR) T914A polymorphisms on growth performance and feed efficiency in young Kazakh white-headed cattle.

Effect of leptin C528T and leptin C73T polymorphisms and pregnancy on adipose tissue formation and carcass grade in Aberdeen Angus heifers and first-calf cows.

Background And Aim: The leptin (LEP) gene plays a role in the regulation of the activity required to obtain food, energy metabolism, and fat deposition and affects the body composition of animals. Lipogenesis is an ineffective process. A lot of energy from feed is expended on the synthesis of adipose tissue.

[COMPARATIVE CHARACTERISTICS OF SKELETAL MUSCLES OF CALVES OF THE KALMYK BREED OF CATTLE].

Using general histological, histochemical, immunocytochemical and morphometric methods, two muscles (longissimus dorsi and biceps femoris) were characterized morphologically and functionally in 15-month-old calves of the new «Aita» breed type (n=6) and in calves of the same age from the base type Kalmyk breed of cattle (n=6). The results of the study showed that the muscles of animals of a new breed type had smaller diameter of the muscle fibers and slightly greater thickness of the endomysium. In the muscles of animals of two types no differences were found between the volumes of nuclei and glycogen in the muscle fibers, as well as between the fractions occupied by loose fibrous connective tissue and the cellular composition of the endomysium.