Analysis of the Environmental Factors Affecting the Growth Traits of Iran-Black Sheep

Tohidi, Reza; Ismailjami, Yunes; Javanmard, Arash

doi:10.22161/ijeab/2.1.21

Cited by 5 publications

(7 citation statements)

References 4 publications

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“…Hence, collectively all of these factors could have contributed to the significant variation in lambs’ growth performance in different years of study. The significant variation in growth traits of lambs born during different years observed in the current study was similar to previous studies on sheep [ 9 , 27 , 28 , 29 ].…”

Section: Resultssupporting

confidence: 91%

“…Male lambs had higher LS means compared to females for all the traits. The male lambs were also found heavier at various age points in studies published by Bahreini Behzadi et al [ 36 ], Rahimi et al [ 9 ] and Tohidi et al [ 28 ] on Kermani, Makuie and Iran-Black sheep, respectively. A possible reason for males being heavier at birth is explained by Benyi et al [ 37 ], who stated that male lambs grow faster in the uterus than females.…”

Section: Resultsmentioning

confidence: 91%

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Environmental Effects and Genetic Parameters for Growth Traits of Lohi Sheep

Sharif

Ali

Dawood

et al. 2022

Animals

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Estimating genetic parameters for growth traits is crucial to plan breeding strategies for improving meat production in indigenous sheep breeds. The study first tested the effects of environmental and maternal effects on five growth traits, including birth weight (BWT), weight at 120 days (WT120), weight at 180 days (WT180), weight at 270 days (WT270) and weight at 365 days of age (WT365) and then estimated genetic parameters for these traits using data obtained in 1215 Lohi sheep. The effects of factors, including year (YOB), season (SOB) and type of birth (TOB), age of dam (AOD) and sex on growth traits of Lohi sheep, were examined using analysis of variance (ANOVA) in R software. Sex, TOB and YOB significantly affected all studied traits. The estimates of direct and maternal heritability for BWT and WT120 were 0.15 ± 0.08 and 0.20 ± 0.06, and 0.45 ± 0.16, 0.21 ± 0.08, respectively. The direct heritability estimates for WT180, WT270 and WT365 were 0.20 ± 0.07, 0.21 ± 0.07 and 0.19 ± 0.08, respectively. Due to the high heritability estimate obtained for WT120 compared to other studied traits, and its strong genetic correlation (>0.9) with post-weaning growth traits, it is recommended that selection must be practiced on WT120 to improve the growth performance of Lohi sheep. The results could be used for the development of genetic/genomic selection programs aiming to improve the production performance of the Lohi sheep.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 91%

Environmental Effects and Genetic Parameters for Growth Traits of Lohi Sheep

Sharif

Ali

Dawood

et al. 2022

Animals

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“…The weights of lambs at all ages were significantly influenced by birth-year of lambs in this study. Similarly, the significant effects of birth-year of lambs in growth traits in other sheep breeds were reported by several research workers (Vivekanand et al 2014, Nirban et al 2015, Tohidi et al 2017. The significant variations in body weights at all ages among lambs in different years may be attributed to differences in management, selection of rams and environmental conditions such as ambient temperature, humidity, rainfall etc.…”

mentioning

confidence: 59%

Growth performance and effect of non-genetic factors affecting growth traits in Garole sheep

KARMAKAR

Behera²,

Mandal

2018

Indian J of Anim Sci

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“…The significant effects on the performance of lambs born in various years may result from numerous causes including variation in agro-climatic conditions, nutrition, type and quality of fodder, incidence of disease, breeder's skill, selection strategy, herdsman's ability to supervise labour, and financial resources (Dass et al, 2004;Assan & Makuza, 2005;Gbangboche et al, 2006;Vatankhah & Salehi, 2010;Al-Bial & Singh, 2012;Tohidi et al, 2017). In the present investigation, the SOB was divided into two major lambing seasons, that is, S1 (spring), S3 (autumn) (natural lambing seasons of small ruminants in Pakistan), and two minor (S2, summer; S4, winter) ones.…”

Section: Resultsmentioning

confidence: 99%

Analysis of non-genetic and genetic influences underlying the growth of Kajli lambs

et al. 2020

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Data on 2931 Kajli lambs, born from 2007 to 2018, were used to quantify environmental and genetic effects on growth performance of Kajli sheep. Traits considered for evaluation were birth weight (BWT), 120-day adjusted weight (120DWT), 180-day adjusted weight (180DWT), 270-day adjusted weight (270DWT), and 365-day adjusted weight (365DWT). Fixed effects of year of birth, season of birth, sex, birth type, and dam age on these traits were evaluated using linear procedures of SAS, 9.1. Similarly, BWT, 120DWT, 180DWT, and 270DWT were used as fixed effects mixed model analyses. Variance components, heritability and breeding values were estimated by restricted maximum likelihood. The genetic trend for each trait was obtained by regression of the estimated breeding values (EBV) on year of birth. Analyses revealed substantial influence of birth year on all traits. Sex and birth type were the significant sources of variation for BWT and 120DWT. Season of birth did not influence birth weight meaningfully, but had a significant role in the expression of 120DWT, 180DWT, and 270DWT. Heritability estimates were generally low (0.003 ± 0.018 to 0.099 ± 0.067) for all traits. With the exception of the genetic correlation of 180DWT and 365DWT, the genetic correlations between trait were strong and positive. Only 365DWT had a positive genetic trend. Although the heritability estimates for almost all weight traits were low, high and positive genetic correlations between BWT and other weight traits suggest that selection based on BWT would result in the improvement of other weight traits as a correlated response.Keywords: bodyweight, breeding value, genetic correlation, sheep

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Analysis of the Environmental Factors Affecting the Growth Traits of Iran-Black Sheep

Cited by 5 publications

References 4 publications

Environmental Effects and Genetic Parameters for Growth Traits of Lohi Sheep

Environmental Effects and Genetic Parameters for Growth Traits of Lohi Sheep

Growth performance and effect of non-genetic factors affecting growth traits in Garole sheep

Analysis of non-genetic and genetic influences underlying the growth of Kajli lambs

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