Influence of HF sires on milk production performance of F1 hybrid cows in high yielding herd
1998
Pogorzelska, J. | Wielgosz-Groth, Z. | Kijak, Z. (Akademia Rolniczo-Techniczna, Olsztyn (Poland). Katedra Hodowli Bydla)
The investigation concerned 3 successive 305-day lactation yields of F1 generation cows descending from Holstein-Friesian bulls (Atut, Mack) compared with Black-and-White breed female contemporaries. 289 lactation yields have been analysed. The milk yield and composition in the 3 lactations, the course of milk performance based on milk yields in successive tierces of each lactation have been determined and the breeding performance of cows has been characterized. HF bulls had a significant influence (P0.01) on a improvement of the cows' milk yield. Daughters of Atut gave 4914 kg of milk in lactation I and 6807 kg in lactation III; daughters of Mack increased their milk yield from 5219 in lactation I to 7106 kg in lactation III, and BW cows from 4392 to 5275 kg, respectively. The fat content in the milk of F1 generation hybrids was a little lower than that in the milk of the BW breed cows. An average protein content in all the groups was at a similar level (3.26-3.37 percent). The evaluated cows were characterized with good fertility
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