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Full-Text Articles in Medicine and Health Sciences
Effect Of Some Environmental Factors On Milk Yield Traits In A Brown Swiss Herd Reared At The Bahri Dağdaş International Agricultural Research Institute, Muammer Ti̇lki̇, Şeref İnal, Mehmet Çolak, M. Emi̇n Teki̇n
Effect Of Some Environmental Factors On Milk Yield Traits In A Brown Swiss Herd Reared At The Bahri Dağdaş International Agricultural Research Institute, Muammer Ti̇lki̇, Şeref İnal, Mehmet Çolak, M. Emi̇n Teki̇n
Turkish Journal of Veterinary & Animal Sciences
This study was carried out to investigate milk yield traits and some environmental factors affecting milk yield traits in Brown Swiss cattle reared at the Bahri Dağdaş International Agricultural Research Institute. Between 1987 and 1998, 730 lactation records obtained from 273 cows were evaluated. The least-squares means of measured milk yield, 305-day milk yield, dry period and lactation duration were 3631 kg, 3332 kg, 97.1 days and 313.8 days, respectively. Both year and age statistically affected (P < 0.01-0.001) milk yield and lactation duration, but the calving season was not affected (P > 0.05). The effect of the year on dry period was also significant (P < 0.01), but the effect of age and calving season were not significant (P > 0.05).
The Estimation Of Phenotypic And Genetic Parameters For Calf Birth Weight And Gestation Length Of Brown Swiss Cows Reared At The Bahri Dağdaş International Agricultural Research Institute, Muammer Ti̇lki̇, Şeref İnal, Mehmet Emi̇n Teki̇n, Mehmet Çolak
The Estimation Of Phenotypic And Genetic Parameters For Calf Birth Weight And Gestation Length Of Brown Swiss Cows Reared At The Bahri Dağdaş International Agricultural Research Institute, Muammer Ti̇lki̇, Şeref İnal, Mehmet Emi̇n Teki̇n, Mehmet Çolak
Turkish Journal of Veterinary & Animal Sciences
This study was carried out to estimate the phenotypic and genetic parameters for the gestation length and birth weight of Brown Swiss cattle reared at the Bahri Bağdaş International Agricultural Research Institute. The experimental material consisted of 891 calving records and 666 gestation length records between 1989 and 2000. The least-squares means of birth weight and gestation length were 35.6 kg and 284 days, respectively. Except for the effect of the dam's age on gestation length, all other factors investigated in this study had significant effects on both gestation length and birth weight (P < 0.05-0.001). The estimations of heritability and repeatability for birth weight were 0.10 and 0.15, respectively. Estimated repeatability for gestation length was 0.14.