Direct breeding of dairy cattle for higher resistance of clinical mastitis and claw diseases - estimation of breeding value and calculation of health index
The paper deals with the issue of breeding to increase resistance to clinical mastitis and claw diseases in dairy cattle. The procedure for collecting data on diseases in dairy cattle is presented using the web application “The Diary of Diseases and Medication” (the Diary). The editing of data and the selection of herds for the genetic evaluation are described. The definition of the analysed trait is the occurrence of disease/disorders in lactation. Claw diseases are divided into three summary traits as infectious, non-infectious and overall claw diseases/disorders including lameness. The method used is a linear animal model with fixed traits: herd, year, calving, and parity, including the random additive and the random environmental effect. The single step method is used to estimate genomic breeding values. The analysis was completed by calculation of the health index for cows.
Kašná Eva, Ing., Ph.D.
Krupová Zuzana, Ing., Ph.D.
Krupa Emil, Ing., Ph.D.
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