Estimates of genetic and environmental (Co)variances for 305-day milk yield and calving intervals in Holstein Fresian cattle

Ulutas Z., Akman N., Akbulut O.

TURKISH JOURNAL OF VETERINARY & ANIMAL SCIENCES, cilt.28, sa.1, ss.101-105, 2004 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 28 Sayı: 1
  • Basım Tarihi: 2004
  • Dergi Adı: TURKISH JOURNAL OF VETERINARY & ANIMAL SCIENCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.101-105
  • Atatürk Üniversitesi Adresli: Evet

Özet

In this study, the data consist of 305-day milk yield, calving intervals and pedigree information regarding Holstein cows raised on the Gelemen state farm and calved between 1982 and 1997. Estimates of genetic parameters and variance components of 305-day milk yield and calving intervals were obtained by restricted maximum likelihood analyses fitting an animal model. Heritabilities of milk yield and calving intervals were 0.16 +/- 0.055 and 0.058 +/- 0.0436, and the replications of the same traits were 0.35 +/- 0.031 and 0.058 +/- 0.040, respectively. While the genetic correlation between 305-day milk yield and calving intervals was high (0.69 +/- 0.300), phenotypic correlation was rather low (0.18 +/- 0.033). High, positive correlation between 305-day milk yield and calving intervals was interpreted as an increase in 305-day milk yield causing a decrease in calf number per time unit.