Dalaman Tarım İşletmesinde Yetiştirilen Siyah-Alacalarda Buzağılama Mevsiminin Süt Verimine Etkisi

Muğla İli Dalaman Tarım İşletmesinde 1989 1996 yılları arasında yetiştirilen 251 hayvana ilişkin toplam 866 laktasyon verileri toplanarak değerlendirilmiştir. Aylık ortalama hava sıcaklıkları dikkate alınarak iki buzağılama mevsimi oluşturulmuştur. Bunlar, konfor sınırları içerisinde olan 1. buzağılama mevsimi (01 Kasım 30 Nisan) ve 2. buzağılama (01 Mayıs 31 Ekim) mevsimidir. Süt verimleri, buzağılama yılı, laktasyon sırası ve buzağılama mevsimi değerlendirilmiştir. Yapılan değerlendirmede 305 günlük süt verimine laktasyon sırası (p < 0.01), buzağılama yılı (p < 0.01) ve buzağılama mevsiminin etkisi (p < 0.01) önemli bulunmuştur. Süt verimine ilişkin 1. ve 2. buzağılama mevsiminin en küçük kareler ortalamaları ve standart hataları sırasıyla 7493.54±70.29 kg ve 7180.63±81.08 kg olarak belirlenmiştir

Anahtar Kelimeler:

Buzağılama mevsimi, süt verimi, Siyah-Alaca

EFFECTS OF CALVING SEASON ON MILK YIELD OF HOLSTEIN COWS RAISED AT DALAMAN STATE FARM IN TURKEY

Data of 866 lactations collected from 251 cows raised at Dalaman State Farm in Muğla province between 1989 and 1996 were analyzed. Two calving seasons were determined on data set based on average monthly air temperature. These are the first calving season (November 1st - April 30th) which is within the comfort zone for cows, and the second calving season (May 1st - October 31st). Milk yield, calving year, lactation number and calving season were evaluated. The effect of lactation number (p < 0.01), calving year (p < 0.01) and, calving season (p < 0.01) on 305-d milk yield were found statistically significant. The least-square means and standard errors of milk yield for the first and the second calving season were 7493.54±70.29 kg and 7180.63±81.08 kg, respectively.

Keywords:

Calving season, milk yield,

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Geliş Tarihi : 30.11.2007
Kabul Tarihi : 30.12.2007