Genetic analysis of growth traits in Iranian<i>Makuie</i>sheep breed

Jafari, Sanaz; Hashemi, Ali; Manafiazar, Ghader; Darvishzadeh, Reza; Razzagzadeh, S.; Farhadian, Mohammad

doi:10.4081/ijas.2012.e18

Cited by 12 publications

(7 citation statements)

References 17 publications

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“…The fixed effects on all studied traits of both breeds were generally significant (P<0.01or P<0.05) except for the effects of year of birth on BW and parity on WW and ADG of Barki lambs that were insignificant. Similar significant fixed effects on BW, WW and ADG of lambs of various sheep breeds have been well depicted in the literature (Selvaggi et al 2011, Jafari et al 2012, Mohammadi et al 2013, Mokhatri et al 2013, Jalil-Sarghale et al 2014, Rahimi et al 2014, Al-Samarai et al 2015, Aguiree et al 2016, AL-Bial et al 2016, Taghi et al, 2016, Tohidi et al2016, Marufa et al, 2017and Jawasreh et al, 2018.…”

Section: Resultssupporting

confidence: 68%

“…The correlations indicated high degree of resemblance among the growth trait of both Barki and Rahmani lambs in their response to the permanent environmental effects. Jafari et al (2012) found r c values of 0.44, 0.31 and 0.95 between BW and WW, between BW and ADG and between WW and ADG of Makuie lambs, respectively in Iran. Shokrollahi and Zandieh (2012) and Rashidi (2013) depicted low r c values of 0.35 and 0.21 between BW and WW of Kurdish sheep and Black sheep in Iran, respectively.…”

Section: Genetic and Phenotypic Correlationsmentioning

confidence: 88%

“…Knowledge of genetic and phenotypic parameters is important for determination of the optimal breeding strategies for the genetic improvement of the lambs' growth traits (Selvaggi et al 2011, Jafari et al 2012, Shokrollahi and Zandieh 2012, Javed et al 2013, Mohammadi et al 2013, Mokhatri et al 2013, Rashidi 2013, Jalil-Sarghale et al 2014, Al-Samarai et al 2015, Aguirre et al 2016, AL-Bial et al 2016, Bayeriyar and Hadi 2016and Jawasreh et al 2018). An accurate prediction of breeding value of growth traits of lambs is an integral part of most genetic improvement breeding programmes (Javed et al 2013, Akthar et al 2014, Roshanfekr 2014, Ahmadpanah et al 2016, Eteqadi et al 2016, Baneh and Ahmadpanah 2018, Yadavet al 2018and Sallam et al 2019.…”

Section: Introductionmentioning

confidence: 99%

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Genetic Analysis of Pre-Weaning Growth Traits of Barki and Rahmani Lambs

Hammoud

Salem

2019

Egyptian Journal of Animal Production

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Data relevant to 704 Barki and 732 Rahmani lambs born at Alexandria University Experimental Station between 1991-2014 were utilized in this investigation to estimate genetic parameters, breeding values and genetic trends of birth weight (BW), weaning weight (WW) and average daily gain (ADG). The fixed effects of season and year of birth, sex of lamb, type of birth and parity on the considered traits were also studied. The least squares analysis with unequal subclass numbers showed that the overall means of BW, WW and ADG of Barki lambs were 3.69 kg, 20.53 kg and 139.7 g, respectively, the corresponding values for Rahmani lambs were 3.54 kg, 20.09 kg and 137.8 g, respectively. The analysis also indicated that fixed factors effects on all studied traits of both breeds were generally significant (P<0.01or P<0.05) except for the effects of year of birth on BW and parity on WW and ADG of Barki lambs were not significant. Genetic parameters and breeding values for the studied traits were estimated using the Wombat programme fitting Multiveriate Animal Models. Estimates of the direct heritability (h 2 a) were 0.186, 0.078 and 0.073 for BW, WW and ADG of Barki lambs, respectively. The corresponding values for Rahmani lambs were 0.285, 0.130 and 0.121, respectively. Estimates of the maternal heritability (h 2 m) were 0.121, 0.099 and 0.103 for BW, WW and ADG of Barki lambs, respectively. The respective values for Rahmani lambs were 0.097, 0.040 and 0.033, respectively. Estimates of the fraction of variance due to maternal permanent environmental effects (C 2) were 0.024, 0.022 and 0.016 for BW, WW and ADG of Barki lambs, respectively. The corresponding values for Rahmani lambs were 0.094, 0.039 and 0.033, respectively. Maternal effects were considerable portion of variation for early growth traits of both breeds. All correlations were positive and significant (P<0.01). The genetic corrletions were extermely high, being 0.993, 0.991 and 1.000 between BW and WW, between BW and ADG and between WW and ADG of Barki lambs, respectively. The corresponding values for Rahmani lambs were 0.685, 0.677 and 1.000. The maternal genetic correlations were high to extremely high being of 0.775, 0.753 and 0.999 between BW and WW, between BW and ADG and between WW and ADG of Barki lambs, respectively. The respective values for Rahmani lambs were 0.984, 0.988 and 1.000, respectively. The maternal permanent environmental correlations among growth traits of both breeds were extremely high ranged from 0.926 to 0.997. The phenotypic correlations were moderate since they varied from 0.395 to 0.479 between BW and each of WW and ADG of both breeds, and were extremely high being 0.994 and 0.996 between WW and ADG of Barki and Rahmani lambs, respectively. High and positive genetic correlations among lamb's growth traits of both breeds showed that improvement of one trait by selection would cause positive progress in the others. The breeding values for BW, WW and ADG of Barki rams ranged between-0.227 and 0.333 kg, between-1.666 and 2.444 kg and betwe...

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Section: Resultssupporting

confidence: 68%

Section: Genetic and Phenotypic Correlationsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Genetic Analysis of Pre-Weaning Growth Traits of Barki and Rahmani Lambs

Hammoud

Salem

2019

Egyptian Journal of Animal Production

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“…However, the main purpose of flock holders is mutton production owing to the high economic and religious values of sheep meat in Iran. The breed is raised in extensive or semi-intensive systems (Jafari et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Estimation of genetic parameters for body measurements and their association with yearling liveweight in the Makuie sheep breed

Jafari¹,

Hashemi²

2014

SA J. An. Sci.

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The main objective of this study was to estimate the genetic parameters for body measurement and yearling live bodyweight traits in the Makuie sheep breed. The data set consisted of 2 144 lambs from 122 sires and 984 dams recorded in 21 years from 1989 to 2009 at the Makuie Sheep Breeding and Raising Station (MSBS). The traits that were studied were height at withers, height at rump, body length, heart girth, leg circumference and yearling weight. The analyses were carried out based on an animal model with the restricted maximum likelihood (REML) approach using a derivate-free (DF) algorithm. Six animal models were fitted, differentiated by including or excluding maternal effects, and with and without covariance between maternal and direct genetic effects. Ignoring the maternal effects, the direct heritability was estimated as 0.20, 0.24, 0.10, 0.14, 0.02 and 0.36 for height at wither, height at rump, body length, heart girth, leg circumference and yearling weight, respectively. The estimates were slightly higher when maternal effects, genetic or environmental, were ignored in the analyses. Using bivariate analysis, the estimates for additive genetic correlations ranged from 0.56 to 0.81 among the studied traits. A log-likelihood ratio test (LRT) was used to select the most appropriate univariate model for each trait. Based on LRT, the direct additive genetic and maternal permanent environmental effects were regarded as an important source of variation of the studied traits. The estimates of genetic parameters can be considered a basis for calculating selection indices for body measurements, as well as revealing their association with yearling bodyweight traits.

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“…Ewes and rams are often kept in the herd up to 7 parities and 5 breeding seasons, respectively. Lambing occurs once a year (late January to March) (Jafari et al, 2012). Even though some studies on Makouie sheep (growth traits, fleece and post-weaning weight, some reproductive traits) have been reported Jafari et al, 2012;Rahimi et al, 2014), very little is known about the genetic attributes of LSB in this breed.…”

Section: Introductionmentioning

confidence: 99%

Bayesian threshold analysis of litter size in sheep

Mortazavi

Alijani

Ghaderi–Zefrehei

et al. 2022

Rev. colomb. cienc. pecu.

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This unedited manuscript has been accepted by RCCP for future publication and is provisionally published on our website. The manuscript will undergo copyediting, typesetting, and galley review before final publication. Please note that this advance version may differ from the final version. Bayesian threshold analysis of litter size in sheep Análisis de umbral bayesiano del tamaño de la camada en ovejas Análise de limiar bayesiano do tamanho da ninhada em ovinos

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Genetic analysis of growth traits in IranianMakuiesheep breed

Cited by 12 publications

References 17 publications

Genetic Analysis of Pre-Weaning Growth Traits of Barki and Rahmani Lambs

Genetic Analysis of Pre-Weaning Growth Traits of Barki and Rahmani Lambs

Estimation of genetic parameters for body measurements and their association with yearling liveweight in the Makuie sheep breed

Bayesian threshold analysis of litter size in sheep

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