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Amou Posht-e Masari, H., Shadparvar, A., Ghavi Hossein-Zadeh, N., Hadi Tavatori, M. (2015). Estimation of genetic trend for body weight of Shal sheep. Aquatic Physiology and Biotechnology, 4(1), 47-58.
H. Amou Posht-e Masari; A. A. Shadparvar; N. Ghavi Hossein-Zadeh; M. H. Hadi Tavatori. "Estimation of genetic trend for body weight of Shal sheep". Aquatic Physiology and Biotechnology, 4, 1, 2015, 47-58.
Amou Posht-e Masari, H., Shadparvar, A., Ghavi Hossein-Zadeh, N., Hadi Tavatori, M. (2015). 'Estimation of genetic trend for body weight of Shal sheep', Aquatic Physiology and Biotechnology, 4(1), pp. 47-58.
Amou Posht-e Masari, H., Shadparvar, A., Ghavi Hossein-Zadeh, N., Hadi Tavatori, M. Estimation of genetic trend for body weight of Shal sheep. Aquatic Physiology and Biotechnology, 2015; 4(1): 47-58.

Estimation of genetic trend for body weight of Shal sheep

تحقیقات تولیدات دامی
Article 5, Volume 4, Issue 1, March 2015, Pages 47-58    PDF (240.27 K)
Document Type: Research Paper
Authors
H. Amou Posht-e Masari1; A. A. Shadparvar* 2; N. Ghavi Hossein-Zadeh2; M. H. Hadi Tavatori3
1Former MSc. Student, Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan
2Associate Professor, Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan
3Instructor, Department of Animal Science, Qazvin’s Agricultural and Natural Resources Researches Center
Abstract
In this research genetic trends for body weight traits of Shal lambs, including: birth weight (BW), weaning weight (WW), 6-month weight (6MW), 9-month weight (9MW) and yearling weight (YW) were studied over a 16-year period. Genetic parameters were estimated using restricted maximum likelihood (REML) method under animal model and breeding values of animals were predicted with Best Linear Unbiased Prediction (BLUP) methodology with single-trait and five-trait animal models. Genetic trends were estimated by regressing the mean of breeding values on year of birth. Direct heritability for BW, WW, 6MW, 9MW and YW were estimated 0.32, 0.47, 0.32, 0.41 and 0.28, respectively. Genetic trends for these traits from both single- and five-trait analyses were estimated (-3 and 4), (32 and 35), (-18 and 10), (27 and 28), (-3 and 11) g per year, respectively, and were non-significant (P>0.05). Also, genetic progress for these traits from both single- and five-trait analyses were calculated (1 and 118), (316 and 918), (404 and 438), (522 and 672) and (60 and 379) g in studied period, respectively. The highest genetic trend was for WW, which had the highest heritability. Despite relatively high heritability for all studied traits, insignificant genetic trends for these traits indicate an undesirable selection program in Shal sheep.
Keywords
Genetic trend; Shal sheep; Animal model; body weight
References

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