Prediction Of Calving Interval And Survival Breeding Values For Foreign Bulls Without Daughters In Ireland
نویسندگان
چکیده
Poor cow fertility has been identified as a growing problem in Irish dairy herds. In this seasonal calving and the grass based production system, poor fertility results in a significant loss in farm income (Veerkamp et al., 2001) due to forced culling or a shift in calving pattern. In order to arrest this trend, subsequent calving interval (CIV) and survival to the next lactation (SUV) has been introduced as objective traits in the dairy breeding goal, as measures of cow fertility and longevity (Veerkamp et al., 2001). Calving interval was chosen as a measure of fertility because of its relationship with direct measures of fertility, direct relevance in the seasonal calving production system and availability of data from milk records.
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