Effects of some factors on milk yield and components of Holstein-Friesian cattle in England

Bu çalışma, İngiltere’deki rastgele seçilmiş beş ayrı özel işletmede yetiştirilen Siyah-Alaca sığırların laktasyon süreleri, gerçek ve 305 günlük süt verimleri, sütteki yağ ve protein oranları ile somatik hücre sayılarının belirlenmesi, bu verimler üzerinde bazı çevre faktörlerinin etkilerinin incelenmesi amacıyla yapılmıştır. Araştırmanın materyalini 1994-2003 yılları arasında yetiştirilen Siyah-Alaca sığırlardan elde edilen 2514 verim değeri oluşturmuştur. Siyah-Alaca sığırların verim değerlerinin istatistik analizlerinde GLM prosedüründen contrast-testi kullanılmıştır. İncelenen süt verimi özelliklerinden laktasyon süreleri, gerçek ve 305 günlük süt verimleri, sütteki yağ ve protein oranları ile somatik hücre sayısına ait genel ortalamalar 324,32 gün, 7715,23 kg, 7218,62 kg, %4,028, %3,333 ve 137.998 hücre/ml olarak belirlenmiştir. Çalışmada, etkileri araştırılan faktörlerden hayvanların yetiştirildikleri çiftliğin ve laktasyona başlanan yılın tüm özellikler üzerinde P

This study was conducted to determine the duration of lactation, lactation and 305 days milk yield, milk fat and protein percentage and somatic cell counts of Holstein-Friesian cattle selected randomly in five private farms in England and to investigate the effects of some environmental factors on these traits. Material of the study was 2514 yield records collected from Holstein-Friesian cattle between the years 1994 and 2003. In the statistical analysis of the yields, contrast-test of the GLM procedure in SAS programme package was used. General average of the duration of lactation, lactation and 305 days milk yield, milk fat and protein percentage and milk somatic cell counts were 324.32 days, 7715.23 kg, 7218.62 kg, 4.028%, 3.333% and 137,948 cell/ml respectively. During the study, the farm where the animals were kept and the year in which lactation started made significant effects at P

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