Effect of blood proportion of Red Pied Holstein breed in genotype of Pinzgau female crosses on their milk yield and milk composition
2000
Kica, J. | Oravcova, M. | Chrenek, J. | Krupa, E. (Research Institute of Animal Production Nitra, (Slovak Republic))
We compared the parameters of milk performance in dairy cows of Slovak Pinzgau breed with crosses from breeding for improvement with Red Pied milk cattle from herds registered for herd recording. Highly significant effect (P0.01) of cow's origin, herd, length of lactation and age at first calving on milk production was found by the analysis of covariance. Milk production increased with rising heredity share of milk breeds in crosses of Pinzgau breed. The highest highly significant (P0.01) difference in efficiency was found in crosses PZ-55, with heredity share 50-75% milk breeds. The effect of herd and year of calving, i.e. factors of the production environment, influenced the variability of protein content in milk highly significantly (P0.01) from the fixed effects in both lactations in the analysed set of dairy cows. We found highly significant effect (P0.01) of herd and significant (P0.05) effect of dairy cows' origin on variability of fat content in milk in first lactation only. The mentioned comparison of efficiency parameters of individual breed types of dairy cows shows that with rising proportion of heredity share of milk breeds it is necessary to create adequate breeding conditions, mainly the system and intensity of nutrition, to realise the genetic potential of animals well
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