Comparison of fertility traits of Slovak Pied breed, Black Spoted breed and their crosses
1996
Huba, J. | Peskovicova, D. | Chrenek, J. | Kmet, J. (Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovakia))
Fertility traits are compared in cows of the Slovak Pied breed, holsteinized Black and White breed and their crosses from combination and absorptive crossings. A model of analysis of covariances contained the fixed effects in the herd, year of calving, genotype group and concomitant variables of milk production over 305-day current lactation and duration of insemination interval. The worst values of fertility traits were determined in the 1st lactation. Slovak Pied dairy cows had a statistically highly significantly shorted days open in all lactations in comparison with the Holstein cows (by 12.5; 15 an 13 days for lactation numbers 1 to 3). The Slovak breed had a statistically highly significantly longer period of pregnancy (according to lactation number by 5.3; 7.2 and 5 days). The genotype groups of the Black and White cattle showed smaller differences in the indicators, and except the length of service period in the second lactation and the calving interval in the 3rd lactation, they were insignificant.
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