Effects of rearing, sire and calving season on growth and milk efficiency in dairy cows
Broucek, J.(Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic))E-mail:broucek@vuzv.sk | Kisac, P.(yskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic)) | Hanus, A.(yskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic)) | Uhrincat, M.(yskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic)) | Foltys, V.(yskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic))
The effect of rearing system, sire, and calving season on live weight and milk production was tested on 32 primiparous cows. Three rearing systems were used from the second week of life to the weaning (pens with automatic drinking cups, individual huts, pens with nursing cows), four sires and four calving seasons were evaluated. The live weight and average daily gains from the 2nd to 10th month of lactation were significantly influenced by the rearing system. This factor also affected milk yield and composition. The highest milk and protein yields were achieved in cows from pens with nursing cows (6,894 kg and 215 kg, respectively). The sires significantly influenced milk yield, as well as concentrations of milk fat, proteins, lactose, nonfat solids and total solids. The calving season significantly affected the production of milk, proteins, lactose and nonfat solids, and milk fat and lactose concentrations. The most productive cows were those calving in winter and spring. In conclusion, live weight and milk production were influenced by the factors studied, some effects were statistically significant.
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