Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Estimation of Genetic Parameters of Body Weight Traits in Ghezel Sheep

  • Baneh, Hasan (Department of Animal Science, Faculty of Animal & Fishery Sciences, Agricultural Science & Natural Resources University of Sari) ;
  • Hafezian, Seyed Hasan (Department of Animal Science, Faculty of Animal & Fishery Sciences, Agricultural Science & Natural Resources University of Sari) ;
  • Rashidi, Amir (Department of Animal Sciences, Faculty of Agriculture, University of Kurdistan) ;
  • Gholizadeh, Mohsen (Department of Animal Science, Faculty of Animal & Fishery Sciences, Agricultural Science & Natural Resources University of Sari) ;
  • Rahimi, Ghodrat (Department of Animal Science, Faculty of Animal & Fishery Sciences, Agricultural Science & Natural Resources University of Sari)
  • Received : 2009.05.03
  • Accepted : 2009.09.18
  • Published : 2010.02.01
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Abstract

The present study was carried out to estimate genetic parameters for body weight traits in Ghezel sheep. The data set used was records of 9,221 lambs from 180 sires and 5,060 dams for birth weight (BW), 7,206 lambs from 167 sires and 4,497 dams for weaning weight (WW) and 6,112 lambs from 157 sires and 3,841 dams for 6-months weight (6 MW), which were collected from 1999 to 2007 (9-years) at Ghezel sheep Breeding Station in west Azarbaijan. Variance components and corresponding genetic parameters were obtained with univariate analyses fitting animal models using restricted maximum likelihood (REML) methods. The most suitable model for each trait was determined based on log likelihood ratio tests. Birth year, lamb gender, type of birth, age of dam and herd were significant sources of variation on BW, WW and 6 MW (p<0.01). Direct estimate of heritability for BW, WW and 6 MW was 0.24, 0.29 and 0.37, respectively. The estimate of maternal permanent environmental variance as a proportion of phenotypic variance was 0.09 and 0.05 for BW and WW, respectively. The results of this study showed that genetic progress for growth traits is possible by selection.

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References

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