Stock supply with high-producing first-calf cows as an important reserve for raising milk productivity of the herd
The research was carried out during 2011-2016 in the conditions of the breeding farms of Vinnytsia region with the aim to establish the dependence of the milk yield of the first-calf cows of the Ukrainian red-motley dairy breed on the live weight and to study the effect of their introduction in the milking herd in different number on the productivity. The studies revealed that the average milk productivity of the first-calf cows was 87.1-97.8 %, and their live weight was 90.0-92.2 % compared to the corresponding indicators of cows from the main herd. The largest amount of milk was obtained from first-calf cows with a live weight of 500-550 kg and a milk yield index of 1,136-1,166, while the cows of the main herd produced high milk yields at the live weight of 591-650 kg with a milk yield index of 1,225. It was found that further increase in live weight to 670 kg was accompanied by a decrease in milk yield by 1,438 kg and a milk yield index by 251. It is most desirable to introduce 30-48 first-calf cows per 100 cows annually, as under such variation the yield of the herd increased by 629-1180 kg.
2. Burkat V. P. Teoriya, metodolohiya i praktyka selektsiyi / V. P. Burkat. - K.: BMT, 1999. - 376 s.
3. Burkat V. P. Problema porody v molochnomu skotarstvi ta shlyakhy yiyi rozvedennya / V. P. Burkat // Visnyk silʹsʹkohospodarsʹkoyi nauky. - 1984. - № 10. - S. 1-7.
4. Vinnychuk D. T. Intensyvne vidtvorennya matochnoho stada / D. T. Vinnychuk. - K.: Urozhay, 1974. - 116 s.
5. Vinnychuk D. T. Shlyakhy stvorennya vysokoproduktyvnoho molochnoho stada / D. T. Vinnychuk, P. M. Merezhko. - K.: Urozhay, 1983. -152 s.
6. Halantsev V. P. Évolyutsyya laktatsyy / V. P. Halantsev, YE. P. Hulyayeva. - L.: Nauka, 1987. - 186 s.
7. Eysner F. F. Vosproyzvodstvo stada na molochnykh fermakh yndustryalʹnoho typa / F. F. Eysner, A. A. Omelʹyanenko, YU. D. Shapovalov. - M.: Kolos, 1978. - 46 s.
8. Omelʹyanenko A. O. Intensyvne vidtvorennya matochnoho stada / A. O. Omelʹyanenko - K.: Urozhay, 1977. - 50 s.
9. Plokhynsʹkyy N. A. Byometryya / N. A. Plokhynsʹkyy. - M.: Yzd-vo MHU, 1970. - 367 s.