from 01.01.1996 until now
Orenburg State Agrarian University (kafedra tehnologii proizvodstva i pererabotki produkcii zhivotnovodstva, Professor of the Institute of Animal Science and Biology)
Orenburg State Agrarian University (kafedra tehnologii proizvodstva i pererabotki produkcii zhivotnovodstva, Professor of the Institute of Animal Science and Biology)
Orenburg, Orenburg, Russian Federation
Russian Federation
employee from 01.01.2016 until now
Orenburg, Orenburg, Russian Federation
employee from 01.01.2005 to 01.01.2025
Orenburg, Orenburg, Russian Federation
VAK Russia 4.1.2
VAK Russia 4.1.3
VAK Russia 4.1.4
VAK Russia 4.1.5
VAK Russia 4.2.1
VAK Russia 4.2.2
VAK Russia 4.2.3
VAK Russia 4.2.4
VAK Russia 4.2.5
VAK Russia 4.3.3
VAK Russia 4.3.5
UDC 636.2.033
UDC 636.22
The aim of the study is to determine the relationship between the genotype of young bulls and energy metabolism parameters — feed intake and digestibility. Objectives: quantitative assessment of gross energy intake of nutrients; determination of gross energy metabolism and its digestibility coefficients in young bulls of different genotypes; analysis of metabolic energy utilization indicators for basic physiological processes (life maintenance and supermaintenance), as well as for product synthesis; calculation of energy utilization efficiency coefficients. The experimental part of the study was carried out in the period 2021–2023 at the production base of Kolos LLC, located in the Orenburg Region. The object of the study was purebred Krasnaya Stepnaya bulls (group I), first-generation crossbreeds with Limuzins (½ Krasnaya Stepnaya × ½ Limuzin – group II), crossbreeds with Herefords (½ Krasnaya Stepnaya × ½ Hereford – group III). Purebred bulls of group I were inferior to their crossbred peers of groups II and III in terms of gross energy consumption by 11.62 (8.66 %) and 8.94 MJ (6.67 %), respectively, in the value of digestibility by 10.8 (12.11 %) and 7.52 MJ (8.43 %), in the level of digestibility coefficient by 2.11 and 1.10 %. The analysis of energy use coefficients showed that crossbred bulls of group II exceeded purebred young animals of group I in terms of KPIVE by 1.17 %, in KPIOE by 1.23 %. At the same time, animals of group III demonstrated an excess over group I in KPIVE by 0.60 %, in KPIOE by 0.58 %. The highest indicators for all analyzed parameters were recorded in Limousin crossbreeds of group II. When compared with them, Hereford crossbreeds (Group III) had a lower level of gross energy consumption by 2.68 MJ (1.87 %); digestibility – by 3.28 %; a reduction in the digestibility coefficient – by 1.01 %; and a reduction in the productive use of metabolizable energy – by 0.65 %.
cattle breeding, Krasnaya Stepnaya breed, crossbreeds with Limuzins and Herefords, bulls, feed energy, feed consumption
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