NDLI: Direct and maternal (co)variance components, genetic parameters, and annual trends for growth traits of Makooei sheep in Iran

Content Provider	Springer Nature Link
Author	Mohammadi, Hossein Moradi Shahrebabak, Mohammad Vatankhah, Mahmood Moradi Shahrebabak, Hossein
Copyright Year	2012
Abstract	Genetic parameters and genetic trends for birth weight (BW), weaning weight (WW), 6-month weight (6MW), and yearling weight (YW) traits were estimated by using records of 5,634 Makooei lambs, descendants of 289 sires and 1,726 dams, born between 1996 and 2009 at the Makooei sheep breeding station, West Azerbaijan, Iran. The (co)variance components were estimated with different animal models using a restricted maximum likelihood procedure and the most appropriate model for each trait was determined by Akaike’s Information Criterion. Breeding values of animals were predicted with best linear unbiased prediction methodology under multi-trait animal models and genetic trends were estimated by regression mean breeding values on birth year. The most appropriate model for BW was a model including direct and maternal genetic effects, regardless of their covariance. The model for WW and 6MW included direct additive genetic effects. The model for YW included direct genetic effects only. Direct heritabilities based on the best model were estimated 0.15 ± 0.04, 0.16 ± 0.03, 0.21 ± 0.04, and 0.22 ± 0.06 for BW, WW, 6MW, and YW, respectively, and maternal heritability obtained 0.08 ± 0.02 for BW. Genetic correlations among the traits were positive and varied from 0.28 for BW–YW to 0.66 for BW–WW and phenotypic correlations were generally lower than the genetic correlations. Genetic trends were 8.1 ± 2, 67.4 ± 5, 38.7 ± 4, and 47.6 ± 6 g per year for BW, WW, 6MW, and YW, respectively.
Starting Page	185
Ending Page	191
Page Count	7
File Format	PDF
ISSN	00494747
Journal	Tropical Animal Health and Production
Volume Number	45
Issue Number	1
e-ISSN	15737438
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-05-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Animal model Genetic trend Growth traits Heritability Selection Makooei sheep Zoology Veterinary Medicine
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Food Animals

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