Sources of variation on milk traits in regions of Vojvodina [Serbia]
2014
Kučević, D. (Faculty of Agriculture, Novi Sad (Serbia)) | Trivunović, S. (Faculty of Agriculture, Novi Sad (Serbia)) | Janković, D. (Faculty of Agriculture, Novi Sad (Serbia)) | Radinović, M. (Faculty of Agriculture, Novi Sad (Serbia)) | Štrbac, Lj. (Faculty of Agriculture, Novi Sad (Serbia))
The study aimed to investigate different sources of variation for milk traits in dairy cows, in first lactation from three breeding regions of Vojvodina (Srem, Banat and Backa). For research purposes a total of 2767 complete and 305 days records of milk yield (MY), fat yield (FY) and milk fat content (MFC) of Holstein-Friesian (HF, black and red) dairy cows was used. All cows were involved in the official milk recording program in 2013 in Vojvodina. Milk traits were analyzed using the mixed linear model in order to explain total variation with bull-sire as a random effect, region, year of birth and calving season as fixed effects and length of lactation as covariates. The average values of MY, MF and MFC in the first lactation of 305 days were 6053.4 kg of milk, 225.24 kg of milk fat and 3.74% milk fat content. The effects of the bull-sire, calving season, year of birth and breeding region on all investigated milk traits were highly significant (p>0.01) during 305 days, but year of birth for complete records had no significant effect on these parameters (P>0.05).
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