T.T. Levitskaya, N.V. Fomina
South Ural State Agrarian University, ul. Gagarina, 13, Troitsk, Chelyabinskaya obl., 457100, Russian Federation
Abstract. We studied growth indicators of young animals taking into account the assessment of diet balance in Chelyabinsk region in 2010–2016. There were three groups of animals: I – purebred Hereford bull-calves and heifers; II – hybrid animals (1/2 blood of Black-and-White breed x 1/2 blood of Hereford breed); III – hybrid animals (1/4 blood of Black-and-White breed x 3/4 blood of Hereford breed). Each group included 10 bull-calves and 10 heifers. All animals up to six months of age were raised under cows-breadwinners. The level of feeding of bull-calves and heifers corresponded to the recommended standards and amounted to 3.47 energy feed units (EFU) for bull-calves in the period of 6–12 months, 2.69 EFU in the period of 12–15 months; for heifers, these values were 2.85 and 3.38 EFU, respectively. Significantly higher growth during the entire period of fattening (6–15 months) was registered in bull-calves and heifers of II group: 1006.89 and 824.52 g/day, respectively, which is by 15.65 and 3.33%; 1.85 and 2.33% more, in comparison with animals of I and III groups, respectively. Bulls from II group spent 10.11 EFU, 101.19MJ of exchange energy and 891.94 g of digestible protein per 1 kg of growth, which was less by 3.16, 3.13, 3.13% than peers from I group. The nutritional intake of feed for 1 kg of growth in calves from II group was 8.02 EFU, 80.09 MJ of exchange energy and 694.71 g of digestible protein, which is lower than in group I by 17.99, 18.04, 18.04% respectively. Thus, the young animals from II group had the greatest ability to convert nutrients from feed into products.
Keywords: growth rates; living conditions; diet structure; Hereford breed; hybrids.
Author Details: T.T. Levitskaya, assist. (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); N.V. Fomina Cand. Sc. (Аgr.), assoc. prof.
For citation: Levitskaya T.T., Fomina N.V. Growth Indicators of Purebred and Hybrid Hereford Young Animals at Industrial Crossings Taking into Account the Assessment of Diet Balance. Dostizheniya nauki i tekhniki APK. 2017. Vol. 31. No. 11. Pp. 52-55 (in Russ.).