Open AccessGROWING HEIFERS HEREFORD BREED SIBIRSKOY SELECTIONS. GROWTH AND DEVELOPMENT IN SIBERIA
Author(s) -
Г. И. Рагимов,
B. A. Rogachev
Publication year - 2020
Publication title -
innovacii i prodovolʹstvennaâ bezopasnostʹ
Language(s) - English
Resource type - Journals
ISSN - 2311-0651
DOI - 10.31677/2311-0651-2019-26-4-58-68
Subject(s) - breed , zoology , sexual maturity , biology , insemination , artificial insemination , reproduction , pregnancy , endocrinology , ecology , genetics
In comparative aspect growth and development, reproductive ability of heifers of Hereford breed at keeping in different rooms at different types of feeding are reflected. Heifers of two experimental groups (2nd and 3rd) in the stable period of maintenance in lightweight premises from birth to 18 months of age on a diet with 15–25 % concentrates, feed costs 2633,3 and 2611,5 K. units (3094,7 and 3019,0 EKE), digestible protein-295,2 and 293,5 kg. it was Revealed that by one and a half years of age, the live weight of heifers of 1–3 groups was 352,20±10,58; 373,70±13,28; 389,30±12,18 kg, which is provided by obtaining an average daily increase of 548–584 g against 475 g in the control group 1 (15,4 and 22,9 %). Economic maturity experienced heifers reached 17–18 months of age, which is 1.5–2 months before the heifers of the control group. In addition, the use of concentrates contributed to the formation of more pronounced meat forms in animals, which distinguish them from their peers of the control group in terms of indices of height, pelvis, downness, bony, broad-bodied. The study of the reproductive function of animals showed that the age of the established sexual cycle of heifers of the experimental groups came 21.4 and 20.6 days earlier than the peers of the control group. The age of fruitful insemination of heifers of the experimental groups is 23.7–40.0 days more than that of the control group peers.