Abstract:In the present study, the productive and reproductive performance of German Holstein Friesian dairy cows and subsequent generations born in Libya were evaluated. The number of cows that had the first lactation record included in the study was 2094. Data were analyzed using REML to estimate factors affecting milk yield and reproductive traits. The model included: month, year of calving, management, generation, origin of sire as fixed effects and sire as random effect. In addition, age at first calving and lacta… Show more
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