Siyah alaca ineklerde dış yapı özellikleri, sürüde kalma süresi ve süt verimi üzerine araştırmalar

Abstract

In this study, the relations between conformation traits, herd life and milk yield inHolstein cows were investigated.The material of this study was formed by 247 headHolstein cows in Polatli State farm and 47 head Holstein cows in Ankara UniversityAgricultural Faculty Research Application Farm. In this study, seventeen linear typetraits on a scale of 1 to 9, and 4 general traits on a scale of 65 to 100 were scored total294 head Holstein cows.Stature was measured by a measuring cane. The relationsbetween traits were investigated by Spearman's rho coefficient. The best regressionequation estimating 305-day milk yield was determined by Stepwise Linear RegressionAnalysisThe mean values of 305 day milk yield in Ankara University Agricultural FacultyResearch Application Farm and Polatli State farm were ranged between 4862-6559 kgand 6908-7847 kg, respectevly. The positive and significant correlations were foundbetween conformation traits and 305-day milk yield. These correlations indicate that anincrease in 305-day milk yield could be achieved through selection on any of theconformation traits.The mean Total score values of Holstein cows that were grown up in Ankara UniversityAgricultural Faculty Research and Application Farm and Polatli Agriculture Enterprisewere ranged between 76.1-76.7 and 77.2-78.0, respectevly, and cows in both twoenterprises were classified as medium class.The positive and significant correlations between the final score and categorical typetraits constituting it, show that an improvement could be seen in the categorical typetraits by selection on final score.Key Words: Conformation traits, milk yield, herd life

In this study, the relations between conformation traits, herd life and milk yield inHolstein cows were investigated.The material of this study was formed by 247 headHolstein cows in Polatli State farm and 47 head Holstein cows in Ankara UniversityAgricultural Faculty Research Application Farm. In this study, seventeen linear typetraits on a scale of 1 to 9, and 4 general traits on a scale of 65 to 100 were scored total294 head Holstein cows.Stature was measured by a measuring cane. The relationsbetween traits were investigated by Spearman?s rho coefficient. The best regressionequation estimating 305-day milk yield was determined by Stepwise Linear RegressionAnalysisThe mean values of 305 day milk yield in Ankara University Agricultural FacultyResearch Application Farm and Polatli State farm were ranged between 4862-6559 kgand 6908-7847 kg, respectevly. The positive and significant correlations were foundbetween conformation traits and 305-day milk yield. These correlations indicate that anincrease in 305-day milk yield could be achieved through selection on any of theconformation traits.The mean Total score values of Holstein cows that were grown up in Ankara UniversityAgricultural Faculty Research and Application Farm and Polatli Agriculture Enterprisewere ranged between 76.1-76.7 and 77.2-78.0, respectevly, and cows in both twoenterprises were classified as medium class.The positive and significant correlations between the final score and categorical typetraits constituting it, show that an improvement could be seen in the categorical typetraits by selection on final score.Key Words: Conformation traits, milk yield, herd life