kefale Getahun - Ethiopian Institute of Agricultural Research

The breeding values of ۹۸ pure Holstein Friesian and crossbred sires were estimated from the lactation and reproductive performance of dairy cattle by using WOMBAT software fitted to mixed animal model evaluation method. The performance records of ۸۵۱ crossbred dairy cows, daughters of ۹۸ sires (AI semen or bulls) were collected from the pedigree sheets at the research farm. Sires with two and more daughters were included in the data. The source of Sires (semen) were worldwide sire (WWS), Western Asia imported and domestic semen source. The traits studied were lactation milk yield (LMY), daily milk yield (DMY), lactation length (LL), age at first service (AFS), age at first calving (AFC), calving interval (CI), days open (DO) and number of service per conception (NSC). From the analysis, the estimated average sire-breeding value for LMY was ۷.۵۱ kg, which varied from ۶۶۳.۸۲ kg below the average to ۱۰۵۵.۱۹ kg above the average. Average estimated sire-breeding value for DMY was ۰.۰۶ in the range of ۱.۲۲ kg below the average to ۲.۲۷ kg above the average breeding value. For LL, the estimated difference of sire breeding value was ۹۷ days ranges from ۴۹.۸ days below the average to ۴۷ days above the average. The sire breeding value of AFS trait was -۰.۷۱ days ranges from ۱۷۹ days below the average to ۱۶۱ days above the average. Sire-breeding value of AFC trait was -۰.۶۶ days estimated from ۲۵۷ days below the average to ۳۶۶ days above the average. Average sire breeding value for CI was -۱.۸۷ days ranges from ۵۰ days below the average to ۳۹ days above the average. For DO, it was -۱.۸۱ days ranged from ۵۶ days below the average to ۴۴ days above the average. Sire breeding value for NSC was varied from ۰.۰۲ below the average to ۰.۰۲ above the average.The breeding values of ۹۸ pure Holstein Friesian and crossbred sires were estimated from the lactation and reproductive performance of dairy cattle by using WOMBAT software fitted to mixed animal model evaluation method. The performance records of ۸۵۱ crossbred dairy cows, daughters of ۹۸ sires (AI semen or bulls) were collected from the pedigree sheets at the research farm. Sires with two and more daughters were included in the data. The source of Sires (semen) were worldwide sire (WWS), Western Asia imported and domestic semen source. The traits studied were lactation milk yield (LMY), daily milk yield (DMY), lactation length (LL), age at first service (AFS), age at first calving (AFC), calving interval (CI), days open (DO) and number of service per conception (NSC). From the analysis, the estimated average sire-breeding value for LMY was ۷.۵۱ kg, which varied from ۶۶۳.۸۲ kg below the average to ۱۰۵۵.۱۹ kg above the average. Average estimated sire-breeding value for DMY was ۰.۰۶ in the range of ۱.۲۲ kg below the average to ۲.۲۷ kg above the average breeding value. For LL, the estimated difference of sire breeding value was ۹۷ days ranges from ۴۹.۸ days below the average to ۴۷ days above the average. The sire breeding value of AFS trait was -۰.۷۱ days ranges from ۱۷۹ days below the average to ۱۶۱ days above the average. Sire-breeding value of AFC trait was -۰.۶۶ days estimated from ۲۵۷ days below the average to ۳۶۶ days above the average. Average sire breeding value for CI was -۱.۸۷ days ranges from ۵۰ days below the average to ۳۹ days above the average. For DO, it was -۱.۸۱ days ranged from ۵۶ days below the average to ۴۴ days above the average. Sire breeding value for NSC was varied from ۰.۰۲ below the average to ۰.۰۲ above the average.

crossbred; Milk production traits; Reproductive traits; Sire breeding value