Evaluation of Relationship between Traits of Milk Production and Reproduction Traits in Dairy Cows of the Slovak spotted breed
2023
Jozef Bujko | Juraj Candrák | Peter Strapák | Július Žitný | Cyril Hrnčár
The aim this work was to evaluate relationships between traits of milk production and reproduction traits in breeding herds of Slovak spotted breed in the period 1992-2010 the results for 10 514 Slovak cows. The basic statistic analysis were analysed using the SAS version 9.1. In the first lactation of dairy cows produced 4 685.18 kg of milk, 193.82 kg of fat and 156.51 kg of proteins. Correlation between evaluated traits of milk production and age at first calving were lower negative and statistically high significant (P<0.0001), scilicet between kgs of milk age at first calving = - 0.06731and correlation between milk in kg with calving interval 1 (r= - 0.06945) and with calving interval 2 (r= - 0.04554) were statistically high significant (P<0.0001). The analyses by the effect on age of first calving was the highest effect of HYS R2= 0.4478 and on calving interval was the highest effect of HYS R2= 0.1526.
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