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Süt Üretimini Etkileyen Faktörler için Bir Path Analizi
(A Path Analysis of Factors Affecting 305-Day Milk Production in Jersey Cows )

Author : Yalçın TAHTALI  Lütfi BAYYURT Samet Hasan ABACI  
Type :
Printing Year : 2019
Number : 2019-3
Page : 171-176


Summary
Bu çalışmanın amacı path analizi kullanarak Jersey ineklerinin 305 günlük süt üretimleri üzerine buzağılama yaşının(AC), buzağılama yılının(YC), buzağılama mevsiminin(SC) ve laktasyon uzunluğunun(LL) doğrudan, dolaylı ve toplam etkilerini belirlemektir. Kullanılan veriler, Türkiye'de Karaköy Devlet Çiftliği'nde 2002'den 2012'ye kadar buzağılayan 617 Jersey ineğinin 1717 laktasyon verim kayıtlarını içermektedir. Sonuçlar AC, YC, SC ve LL' nin Jersey ineklerinin 305 günlük süt üretimi üzerinde istatistiksel olarak önemli etkileri olduğunu göstermiştir. Sonuçlar ayrıca LL' nin 305 günlük süt üretimi üzerindeki doğrudan ve toplam etkilerinin AC' nin, YC ve SC' nin etkisinden daha yüksek olduğunu, ancak AC' nin 305 günlük süt üretimi üzerindeki dolaylı etkisinin en yüksek olduğunu göstermiştir. Sonuç olarak, inek başına süt üretiminin arttırılmasını kolaylaştırmak için, laktasyon uzunluğunun kullanılması, Jersey ineklerinin yönetimi ve genetik değerlendirilmesi için bazı yararlı bilgiler sağlamaktadır.

Turkish Keywords
Korelasyon, Jersey ineği, Path katsayısı

Abstract
The purpose of this paper was to determine the direct, indirect and total effect of age of calving (AC), year of calving (YC), calving season (SC) and lactation length (LL) on 305-day milk production (305-DMP) in Jersey cows using path analysis. The data used included 1717 lactation yield records of 617 Jersey cows calving from 2002 to 2012 on the Karakoy State Farm in Turkey. The results showed that AC, YC, SC and LL had statistically important effects on the 305-day milk production of the Jersey cows. The results further indicated that the direct and total effects of LL on 305-day milk production were higher than the effect of AC, YC and SC, although the indirect effect of AC on 305-day milk production was the highest. As a consequence, to facilitate increasing milk production per cow, the use of the lactation length provides some useful knowledge for management and the genetic evaluation of Jersey cows.

Keywords
Correlation, Jersey cows, Path coefficient

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