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Fırat Üniversitesi Sağlık Bilimleri Veteriner Dergisi |
2006, Cilt 20, Sayı 3, Sayfa(lar) 173-177 |
[ Turkish ] [ Tam Metin ] [ PDF ] |
Comparisons Between Different Methods and Sampling Intervals Used for Estimating Lactation Yield in Holstein Cows |
Durhasan MUNDAN1, Muğdat YERTÜRK1, Mehmet AVCI2, Osman KARABULUT3, Faruk BOZKAYA4 |
1Harran Üniversitesi, Veteriner Fakültesi, Zootekni Anabilim Dalı, Şanlıurfa - TÜRKİYE 2Harran Üniversitesi, Veteriner Fakültesi, Hayvan Besleme ve Beslenme Hastalıkları Anabilim Dalı, Şanlıurfa - TÜRKİYE 3Harran Üniversitesi, Veteriner Fakültesi, Biyometri Anabilim Dalı, Şanlıurfa – TÜRKİYE 4Harran Üniversitesi, Veteriner Fakültesi, Genetik Anabilim Dalı, Şanlıurfa - TÜRKİYE |
Keywords: Estimating Methods, Holstein, Lactation Yield, Sampling Intervals |
In this study, different methods (Swedish, Vogel, Dutch I, Dutch II, Trapeze I, Trapeze II and State Farm) and various sampling intervals (14, 21, 28, 42 and 56 days) used for estimating lactation yield in Holstein cows have been compared. For this purpose, data on daily milk yield of 65 Holstein cows were used.
Average actual lactation yield was 5557.6±90.1 kg and average actual lactation length was 284.0±1.0 days. High correlations were found between actual and estimated lactation yield for all methods and sampling intervals (p<0.001). Lactation yields estimated by using Swedish and Dutch I methods at sampling intervals of 21 and 56 days, Dutch II and Trapeze I methods at sampling interval of 42 days were similar to actual lactation yield (p>0.05). Estimated lactation yields at other sampling intervals were significantly different from actual lactation yield for all methods used (p≤0.05). As a result Swedish and Dutch I methods at sampling intervals of 21 days or Dutch II and Trapeze I methods at sampling intervals of 42 days could be recommended to estimate lactation yields of the Holstein cows studied. |
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