Estimates of (co)variance components for direct and maternal effects on birth weight of Karayaka lambs

Ulutas Z., Sirin E., Aksoy Y., Sahin A., Kuran M.

TROPICAL ANIMAL HEALTH AND PRODUCTION, cilt.45, sa.4, ss.953-956, 2013 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 45 Sayı: 4
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1007/s11250-012-0314-y
  • Dergi Adı: TROPICAL ANIMAL HEALTH AND PRODUCTION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.953-956
  • Anahtar Kelimeler: Maternal heritability, Direct heritability, Best model, Log-likelihood, Animal model, PREWEANING GROWTH TRAITS, VARIANCE-COMPONENTS, GENETIC-PARAMETERS
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

The purpose of this study was to estimate the genetic parameters for birth weight of Karayaka lambs by separating direct genetic, maternal genetic, and maternal permanent environmental effects. Records of 1013 Karayaka lambs born between 2005 and 2010 were analyzed. Six different animal models were examined, all including direct additive genetic variance and various combinations of genetic and environmental maternal effects. The most appropriate model was chosen based on log-likelihood ratio tests. Since model 1 had the smallest likelihood value, it was chosen as the best model in this study. Depending on the model, direct heritability varied from 0.37 to 0.55 and maternal heritability ranged from 0.08 to 0.20 for birth weight.