Dzhulamanov КМ, Iskhakov DSh, Azhakina АР.

Animal Husbandry and Fodder Production. 2025. Vol. 108. No 3. Р. 113-125.

doi:10.33284/2658-3135-108-3-113

Original article

Factors affecting the index assessment of Kazakh White-Headed sires and heifers

 

Kinispay M Dzhulamanov1, Damir Sh Iskhakov2, Anna P Azhakina3

1,2,3Federal Research Centre of Biological Systems and Agrotechnologies of the Russian Academy of Sciences, Orenburg, Russia

1kinispai.d@yandex.ru, https://orcid.org/0000-0001-8039-7471

2Damir_is@mail.ru

3azhakin@rambler.ru

Abstract. The research studied the factors determing the assessment of the breeding value of heifers, including hereditary (sire’s line and genotype by the GH and LEP genes), as well as methodological, depending on the content of the phenotypic data in the calculation. The improvement of the Kazakh White-headed breed at the breeding farm of Omeko-Trud LLC has been carried out based on a two-stage evaluation of sires from the Prints 37, Cactus 7969 and Pion 29 breeding lines. Additionally, genetic markers have been used in the selection process. As a result, a sire improver, Zaslon 26098 from the Prints 37 line and the "desired" VV genotype for the growth hormone gene were identified. Zaslon 26098 is recommended for intensive use in herd reproduction, and a replecement herd should also be formed from his daughters. Intensive use in the breeding campaign also involves the detailed development of a breeding selection plan for sires, taking into account the increased frequency of the V-allele in the herd. The number of young animals with a complex index above 100 was 42.3% among individuals with the LL genotype of the GH gene, in the heterozygous group this indicator reached 68.0%, and the highest proportion (88.9%) of high-value replacement heifers was represented by carriers of the VV variant of the gene.

Keywords: Kazakh sires, heifers, White-Headed breed, breeding line, breeding value, complex index, genotype

Acknowledgments: the work was performed in accordance to the plan of research works for 2023-2025 FSBRI FRC BST RAS (No. FNWZ-2025-0008).

For citation: Dzhulamanov КМ, Iskhakov DSh, Azhakina АР. Factors affecting the index assessment of Kazakh White-Headed sires and heifers. Animal Husbandry and Fodder Production. 2025;108(3):113-125. (In Russ.). https://doi.org/10.33284/2658-3135-108-3-113

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 Information about the authors:

 Kinispay M Dzhulamanov, Dr. Sci. (Agriculture), Head of the Breeding and Genetic Center for Beef Cattle, Federal Research Centre of Biological Systems and Agrotechnologies of the Russian Academy of Sciences, 29 9 Yanvarya st., Orenburg, 460000, tel.: 8(3532)30-81-74.

Damir Sh Iskhakov, post graduate of the Breeding and Genetic Center for Beef Cattle, Federal Research Centre of Biological Systems and Agrotechnologies of the Russian Academy of Sciences, 29 9 Yanvarya st., Orenburg, 460000.

Anna P Azhakina, Master's student of the Breeding and Genetic Center for Beef Cattle, Federal Research Centre of Biological Systems and Agrotechnologies of the Russian Academy of Sciences, 29 9 Yanvarya st., Orenburg, 460000.

The article was submitted 04.07.2025; approved after reviewing 13.08.2025; accepted for publication 15.09.2025.

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