Differences in milk performance of dairy cows of the Slovakian Pied breed of various alpha-casein genotypes
1997
Zitny, J. | Ostertag, I. | Michalickova, E. | Kubek, A. | Trakovicka, A. | Gavalier, M. (Slovenska Polnohospodarska Univ., Nitra (Slovak Republic). Agronomicka Fakulta)
Milk performance of 717 dairy cows of the Slovakian Pied breed in 1st, 2nd, 3rd and 4th lactations was evaluated from the aspect of alpha s1-casein genotypes BB and BC determined by starch gel electrophoresis. Alfa s1-casein genotype BB was determined in 687 animals (95.8 %), genotype BC in 30 animals (4.2 %). The basic description of performance indicators (milk, fat, protein, lactose) shows a clear trend of their quantitative increase in the group of cows with heterozygotic alfa s1-casein genotype combination BC. The results confirmed statistically significant differences (P0.05) between milk production (BCBB) in the first lactation (by 473 kg) and average fat production (BCBB) also in the first lactation (by 20 kg). At summary evaluation of commercial characteristics of cows for all four standardized lactations significant differences (P0.05) were calculated, in view of alfa s1-casein polymorphism, in average milk production (BCBB) (by 515 kg) and average lactose production (BCBB) (by 23 kg).
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