Estimation of genetic parameters for body weight, average daily gains and Kleiber ratios in Makooei Sheep

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Khaltabadi Farahani A.H.; MOHAMMADI H.; MORADI M.H.; RAFAT S.A.; MORADI SHAHREBABAK H.; Taheri Yeganeh A.

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Journal: JOURNAL OF RUMINANT RESEARCH Year:2018 | Volume:6 | Issue:2 Page(s): 75-86

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Title

Estimation of genetic parameters for body weight, average daily gains and Kleiber ratios in Makooei Sheep

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Keywords

SheepQ2

Variance componentQ1

Average daily gainQ1

Kleiber ratioQ1

HeritabilityQ2

Abstract

Background and objectives: In Iran, production of mutton as the main source of red meat does not satisfy the increasing demand of the consumers. To increase meat production, estimation of genetic parameters of economic important traits is necessary for determining breeding goal and selection index. Materials and methods: In this study, the collected data from 1996 to 2014 at the Makooei Sheep Breeding Station (Makoo) in west-Azerbaijan province were used to estimate genetic parameters for growth traits and Kleiber ratios. Traits studied were birth weight (BW), weaning weight (WW), six month weight (6MW) and yearling weight (YW), Average daily gain from birth to weaning (ADGa), Average daily gain from weaning to six months of age (ADGb), Kleiber ratio from birth to weaning (KRa), and Kleiber ratio from weaning to six months of age (KRb). (Co) Variance components were obtained by fitting different animal models using a restricted maximum likelihood (REML) procedure via ASREML program. The most appropriate model for each trait was determined based on log likelihood ratio tests. Results: The most appropriate model for birth weight was model 3 (direct and maternal genetic effects, without considering covariance between them), for weaning weight, six month weight and Average daily gain from birth to weaning the best was model 2 (direct additive genetic effects and maternal permanent environment) and for yearling weight, Average daily gain from weaning to six months, Kleiber ratio from birth to weaning, and Kleiber ratio from weaning to six months of age were consistent with model 1 (direct effects). Direct estimate of Heritability for BW, WW, 6MW, YW, ADGa, ADGb, KRa and KRb was 0. 15± 0. 04, 0. 16± 0. 03, 0. 21± 0. 04, 0. 22± 0. 06, 0. 13± 0. 05, 0. 14± . 04, 0. 06± 0. 03 and 0. 03± 0. 02, respectively. The estimate of maternal Heritability for BW was 0. 08± 0. 02. Genetic correlations ranged from 0. 13 (between YW with KRb) to 0. 94 (between WW with KRa). Conclusion: The results of this study indicated that selection for Kleiber ratio can result in genetic improvement of growth rate as well as feed efficiency.

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APA: Copy

Khaltabadi Farahani, A.H., MOHAMMADI, H., MORADI, M.H., RAFAT, S.A., MORADI SHAHREBABAK, H., & Taheri Yeganeh, A.. (2018). Estimation of genetic parameters for body weight, average daily gains and Kleiber ratios in Makooei Sheep. JOURNAL OF RUMINANT RESEARCH, 6(2 ), 75-86. SID. https://sid.ir/paper/244013/en

Vancouver: Copy

Khaltabadi Farahani A.H., MOHAMMADI H., MORADI M.H., RAFAT S.A., MORADI SHAHREBABAK H., Taheri Yeganeh A.. Estimation of genetic parameters for body weight, average daily gains and Kleiber ratios in Makooei Sheep. JOURNAL OF RUMINANT RESEARCH[Internet]. 2018;6(2 ):75-86. Available from: https://sid.ir/paper/244013/en

IEEE: Copy

A.H. Khaltabadi Farahani, H. MOHAMMADI, M.H. MORADI, S.A. RAFAT, H. MORADI SHAHREBABAK, and A. Taheri Yeganeh, “Estimation of genetic parameters for body weight, average daily gains and Kleiber ratios in Makooei Sheep,” JOURNAL OF RUMINANT RESEARCH, vol. 6, no. 2 , pp. 75–86, 2018, [Online]. Available: https://sid.ir/paper/244013/en

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