Siyah alaca ineklerde dış yapı özellikleri, sürüde kalma süresi ve süt verimi üzerine araştırmalar
Investigations on the conformation traits, herd life and milk yield holstein cows
- Tez No: 213795
- Danışmanlar: PROF. DR. S. METİN YENER
- Tez Türü: Doktora
- Konular: Ziraat, Agriculture
- Anahtar Kelimeler: Conformation traits, milk yield, herd life, Süt verimi, Conformation traits, milk yield, herd life
- Yıl: 2007
- Dil: Türkçe
- Üniversite: Ankara Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Zootekni Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
In this study, the relations between conformation traits, herd life and milk yield in Holstein cows were investigated.The material of this study was formed by 247 head Holstein cows in Polatli State farm and 47 head Holstein cows in Ankara University Agricultural Faculty Research Application Farm. In this study, seventeen linear type traits on a scale of 1 to 9, and 4 general traits on a scale of 65 to 100 were scored total 294 head Holstein cows.Stature was measured by a measuring cane. The relations between traits were investigated by Spearman's rho coefficient. The best regression equation estimating 305-day milk yield was determined by Stepwise Linear Regression Analysis The mean values of 305 day milk yield in Ankara University Agricultural Faculty Research Application Farm and Polatli State farm were ranged between 4862-6559 kg and 6908-7847 kg, respectevly. The positive and significant correlations were found between conformation traits and 305-day milk yield. These correlations indicate that an increase in 305-day milk yield could be achieved through selection on any of the conformation traits. The mean Total score values of Holstein cows that were grown up in Ankara University Agricultural Faculty Research and Application Farm and Polatli Agriculture Enterprise were ranged between 76.1-76.7 and 77.2-78.0, respectevly, and cows in both two enterprises were classified as medium class. The positive and significant correlations between the final score and categorical type traits constituting it, show that an improvement could be seen in the categorical type traits by selection on final score.
Özet (Çeviri)
In this study, the relations between conformation traits, herd life and milk yield in Holstein cows were investigated.The material of this study was formed by 247 head Holstein cows in Polatli State farm and 47 head Holstein cows in Ankara University Agricultural Faculty Research Application Farm. In this study, seventeen linear type traits on a scale of 1 to 9, and 4 general traits on a scale of 65 to 100 were scored total 294 head Holstein cows.Stature was measured by a measuring cane. The relations between traits were investigated by Spearman?s rho coefficient. The best regression equation estimating 305-day milk yield was determined by Stepwise Linear Regression Analysis The mean values of 305 day milk yield in Ankara University Agricultural Faculty Research Application Farm and Polatli State farm were ranged between 4862-6559 kg and 6908-7847 kg, respectevly. The positive and significant correlations were found between conformation traits and 305-day milk yield. These correlations indicate that an increase in 305-day milk yield could be achieved through selection on any of the conformation traits. The mean Total score values of Holstein cows that were grown up in Ankara University Agricultural Faculty Research and Application Farm and Polatli Agriculture Enterprise were ranged between 76.1-76.7 and 77.2-78.0, respectevly, and cows in both two enterprises were classified as medium class. The positive and significant correlations between the final score and categorical type traits constituting it, show that an improvement could be seen in the categorical type traits by selection on final score.
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