Productivity of steers of different genotypes: forecast based on interior indicators

Abstract

Meat productivity and quality of beef are determined by a number of factors, including pedigree traits of animals. Meat productivity is closely related to the biological patterns of their growth and development. Considering the patterns that affect meat productivity enables effective growing and fattening of livestock and obtaining commercially viable beef. To predict economically useful traits in beef cattle breeding, interior indicators can be used, as they reflect the metabolic picture of the animal’s body. The research studies in physiology and biochemistry of livestock aimed at revealing the persistent mechanisms of a growing animal organism make them relevant. The article identifies a correlation between the interior indicators and the fattening indicators of three experimental groups of steers. The main forecasting factors of meat productivity indicators have been substantiated. Regression coefficients have been found and show how much the live weight varies depending on the determining factors. Meat productivity predicting procedures have been modeled with respect to the protein content in blood serum.

Growth, Carcass, Organ Characteristics and Meat Quality of Crossbred Steers from Kalmyk Cows and Kalmyk, Simmental, Hereford, and Kazakh White Headed Bulls

“…The steers were fed according to the requirements developed by Slozhenkina et al (2020), and the "Feed Optima Expert" modular program for this class and age of animal according to season. The diets included feeds produced by the JSC "Berdievsky Elevator" (Table I).…”

The stressing effect of shearing in mid-pregnancy of Zandi ewes on live weight and body sizes of twin lambs at the time of birth

“…The survival of lambs is affected by lamb birth weight and size as well as by the maternal behavior of the ewe. The main reasons for death of lambs include difficult birth, starvation, lack of acceptance by the mother ewe, and low birth weight (Hinch and Brien, 2013;Slozhenkina et al, 2020). Lamb birth weight has a linear relationship with survival rate, with the light lambs have the highest mortality rate (Nowak and Piondron, 2006).…”