Estimation of genetic parameters for growth traits in Omani sheep

Saud al-Subeihi, Ihab Shaat, Sameer D. Pant

Research output: Book chapter/Published conference paperConference paper

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Abstract

The present study aimed to estimate the heritability and genetic correlation for the growth-related traits in Omani native sheep. Studied traits were birth weight (BW), weaning weight (WW), six-month weight (6MW) and yearling weight (YW). For this study, records of growth-related traits (i.e. body weight measured at different ages) were obtained from 2174 lambs reared at Wadi Quraiyat Livestock Research Station (WQLRS) between the period from 2008 to 2016. This phenotypic data included 2174 records for birth weight, 2151 records for weaning weight, 1792 records for six months’ weight and 1442 records for yearling weight. In addition to this phenotype data, pedigree information, dam age, year of production, sex and birth type were also recorded for each lamb. Heritability was estimated by a univariate mixed model using restricted maximum likelihood procedure, and genetic correlation was calculated by a bivariate mixed model. WOMBAT software was used for the statistical analysis. Direct and maternal heritabilities of BW, WW, 6MW and YW were estimated to be 0.16 and 0.16, 0.20 and 0.20, 0.26 and 0.09, and 0.45 and 0.03 respectively. Genetic correlations among various growth traits were positive and ranged from 0.28 to 0.94. This study showed that direct heritabilities increased with age. Selection for improving one trait would improve other traits genetically because of the positive correlation. Keywords: omani sheep, growth traits, heritability, genetic correlation, genetic maternal heritability
Original languageEnglish
Title of host publicationWorld Congress of Genetics Applied to Livestock Production 2018
Pages1-5
Number of pages5
Publication statusPublished - 2018
Event11th World Congress on Genetics Applied to Livestock Production : WCGALP 2018 - Aotea Convention Centre, Auckland, New Zealand
Duration: 11 Feb 201816 Feb 2018
http://www.wcgalp.org/proceedings (Conference proceedings)
http://www.wcgalp.org/

Conference

Conference11th World Congress on Genetics Applied to Livestock Production
Abbreviated titleGenetics
CountryNew Zealand
CityAuckland
Period11/02/1816/02/18
OtherThe World Congress on Genetics Applied to Livestock Production, organized by the Conference Innovators Ltd will take place from 11th February to 16th February 2018 at the Aotea Convention Centre in Auckland, New Zealand. The conference will cover areas like genetic improvement of livestock and opportunity to see first-hand the genetic improvement of livestock.
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growth traits
heritability
sheep
genetic correlation
weaning weight
yearlings
birth weight
lambs
dams (mothers)
pedigree
statistical analysis
livestock
phenotype
body weight
gender

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al-Subeihi, S., Shaat, I., & Pant, S. D. (2018). Estimation of genetic parameters for growth traits in Omani sheep. In World Congress of Genetics Applied to Livestock Production 2018 (pp. 1-5)
al-Subeihi, Saud ; Shaat, Ihab ; Pant, Sameer D. / Estimation of genetic parameters for growth traits in Omani sheep. World Congress of Genetics Applied to Livestock Production 2018. 2018. pp. 1-5
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al-Subeihi, S, Shaat, I & Pant, SD 2018, Estimation of genetic parameters for growth traits in Omani sheep. in World Congress of Genetics Applied to Livestock Production 2018. pp. 1-5, 11th World Congress on Genetics Applied to Livestock Production , Auckland, New Zealand, 11/02/18.

Estimation of genetic parameters for growth traits in Omani sheep. / al-Subeihi, Saud; Shaat, Ihab; Pant, Sameer D.

World Congress of Genetics Applied to Livestock Production 2018. 2018. p. 1-5.

Research output: Book chapter/Published conference paperConference paper

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AU - Shaat, Ihab

AU - Pant, Sameer D.

PY - 2018

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N2 - The present study aimed to estimate the heritability and genetic correlation for the growth-related traits in Omani native sheep. Studied traits were birth weight (BW), weaning weight (WW), six-month weight (6MW) and yearling weight (YW). For this study, records of growth-related traits (i.e. body weight measured at different ages) were obtained from 2174 lambs reared at Wadi Quraiyat Livestock Research Station (WQLRS) between the period from 2008 to 2016. This phenotypic data included 2174 records for birth weight, 2151 records for weaning weight, 1792 records for six months’ weight and 1442 records for yearling weight. In addition to this phenotype data, pedigree information, dam age, year of production, sex and birth type were also recorded for each lamb. Heritability was estimated by a univariate mixed model using restricted maximum likelihood procedure, and genetic correlation was calculated by a bivariate mixed model. WOMBAT software was used for the statistical analysis. Direct and maternal heritabilities of BW, WW, 6MW and YW were estimated to be 0.16 and 0.16, 0.20 and 0.20, 0.26 and 0.09, and 0.45 and 0.03 respectively. Genetic correlations among various growth traits were positive and ranged from 0.28 to 0.94. This study showed that direct heritabilities increased with age. Selection for improving one trait would improve other traits genetically because of the positive correlation. Keywords: omani sheep, growth traits, heritability, genetic correlation, genetic maternal heritability

AB - The present study aimed to estimate the heritability and genetic correlation for the growth-related traits in Omani native sheep. Studied traits were birth weight (BW), weaning weight (WW), six-month weight (6MW) and yearling weight (YW). For this study, records of growth-related traits (i.e. body weight measured at different ages) were obtained from 2174 lambs reared at Wadi Quraiyat Livestock Research Station (WQLRS) between the period from 2008 to 2016. This phenotypic data included 2174 records for birth weight, 2151 records for weaning weight, 1792 records for six months’ weight and 1442 records for yearling weight. In addition to this phenotype data, pedigree information, dam age, year of production, sex and birth type were also recorded for each lamb. Heritability was estimated by a univariate mixed model using restricted maximum likelihood procedure, and genetic correlation was calculated by a bivariate mixed model. WOMBAT software was used for the statistical analysis. Direct and maternal heritabilities of BW, WW, 6MW and YW were estimated to be 0.16 and 0.16, 0.20 and 0.20, 0.26 and 0.09, and 0.45 and 0.03 respectively. Genetic correlations among various growth traits were positive and ranged from 0.28 to 0.94. This study showed that direct heritabilities increased with age. Selection for improving one trait would improve other traits genetically because of the positive correlation. Keywords: omani sheep, growth traits, heritability, genetic correlation, genetic maternal heritability

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al-Subeihi S, Shaat I, Pant SD. Estimation of genetic parameters for growth traits in Omani sheep. In World Congress of Genetics Applied to Livestock Production 2018. 2018. p. 1-5