Estimation of Genetic Parameters for Body Measurements and Their Relationship With Body Weight in Barki Lambs

Gad, Sawsan M.

doi:10.21608/jappmu.2014.70617

Cited by 6 publications

(10 citation statements)

References 11 publications

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“…Positive residual correlation between the traits under study indicated the environmental dependency of these traits and by changing the environmental factors affecting one character it is possible to modify the other trait in similar direction. Consistent with the results of this study, positive phenotypic and residual correlations were reported between morphometric traits in different studies (Abbasi and Ghafouri-kesbi 2011;Gad 2014;Bakhshalizadeh et al 2016) The values of average annual phenotypic trends obtained from fitting linear regression of annual mean morphometric traits were À0.02 ± 0.15 cm (p > .05), 0.07 ± 0.09 cm (p > .05), 0.03 ± 0.12 cm (p > .05), 0.56 ± 0.18 cm (p < .01) and 0.26 ± 0.30 cm (p > .05) for BL, HW, HR, LC and HG, respectively. Therefore, LC increased over the years.…”

Section: Resultssupporting

confidence: 92%

“…The greatest genetic correlation between morphometric traits and YW was for HG-YW (0.52). Similar finding was reported by other studies (Salako 2006;Abbasi and Ghafouri-kesbi 2011;Gad 2014;. Heart girth is a part of tissue measurements (Blackmore et al 1958), while other measurements are related to skeletal measurements (Salako 2006).…”

Section: Resultssupporting

confidence: 90%

“…Similar to the current results, Abbasi and Ghafouri-kesbi (2011), reported positive genetic correlations between morphometric traits and YW in Makuei sheep. Gad (2014) reported positive and high direct genetic correlations between BL-HW (0.81), BL-HG (0.82) and HW-HG (0.46) in Barki sheep. Also, Oliveira et al (2014) estimated positive and high direct genetic correlations between body measurement traits in Santa Inês sheep.…”

Section: Resultsmentioning

confidence: 92%

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Bayesian estimates of genetic parameters and genetic trends for morphometric traits and their relationship with yearling weight in Moghani sheep

Hossein-Zadeh

Ghahremani

2017

Italian Journal of Animal Science

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This study was conducted to estimate variance components, genetic parameters and genetic trends for morphometric traits and their relationship with yearling weight in Moghani sheep. The data set and pedigree information of Moghani sheep were obtained from the breeding station of Moghani sheep (in Ardebil province, Iran) and comprised 2387 lamb records for morphometric traits during 1994 to 2012. Traits considered were height at withers (HW), height at rump (HR), body length (BL), heart girth (HG), leg circumference (LC) and yearling weight (YW). Four different animal models were fitted, differentiated by including or excluding maternal effects, with covariance between maternal and direct genetic effects were implemented by Gibbs sampling methodology. Selection of the best model of analysis for each trait was based on Akaike's information criterion (AIC). Posterior mean estimates of direct heritabilities for BL, HW, HR, LC, HG and YW were 0.34, 0.037, 0.47, 0.073, 0.065 and 0.17, respectively. Estimates of direct genetic correlation between morphometric traits varied from À0.21 (between BL-LC) to 0.67 (between LC-HG). Estimates of direct genetic correlation between morphometric traits and YW were positive and varied from 0.08 (between HW-YW) to 0.52 (between HG-YW). Estimates of direct genetic trends for BL, HW, HR, LC and HG were significant (p < .0001), and their corresponding values were À0.054 ± 0.009, À0.005 ± 0.001, 0.032 ± 0.006, À0.009 ± 0.002 and À0.014 ± 0.003, respectively. The results implied that applicable genetic variations observed for under study traits could be applied in designing future genetic selection plans for Moghani sheep.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 92%

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Bayesian estimates of genetic parameters and genetic trends for morphometric traits and their relationship with yearling weight in Moghani sheep

Hossein-Zadeh

Ghahremani

2017

Italian Journal of Animal Science

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“…The results of body length in current study are in the agreements with results obtained by Gad (2014) and Ibrahim (2015) who found that average body length of Ossimi and Rahmani breeds was (71.5 and 72.3 cm) at 12 months, and the average of body length for Barki lambs at 9 months range from (71 to 75 cm), while, Abd-Alla (2014) reported that the average of body length for Barki sheep was (70.6 cm) at 12 months.…”

Section: Growth Traitssupporting

confidence: 91%

Evaluation of Growth Performance, Blood Metabolites and Gene Expression Analysis in Egyptian Sheep Breeds, in Relation to Age

Ashour¹,

Gad²,

Fayed³

et al. 2020

jwpr

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The growth performance of lambs attributes the economic viability of animals. Faster growth allows lambs to reach maturity in early age. Therefore, the aim of this study was to compare growth performance, blood metabolites and expression of IGF-1, GH, and Leptin genes in three different Egyptian sheep breeds across age. Thirty Egyptian sheep males from three breeds (Ossimi, Rahmani and Barki) were divided into three ages categorize (7-9, 10-12, and 13-16 months). The results showed that there was a significant increase in sheep's live body weights toward advanced ages till the second age category for all breeds, the highest values of linear body measurements were observed in Ossimi breed. There was a non-significant inverse effect of advanced age on blood glucose and total lipids levels in all sheep breeds. There wasn't any significant effect of interaction between age and breed on plasma total protein concentrations. According to age categories, Barki breed showed a significant up-regulation of GH compared to the Ossimi breed in 7-9 months age category. However, Barki breed showed a significant downregulation of IGF-1compared to the Ossimi breed in 7-9 months. Meanwhile, Leptin expression showed significant differences in Ossimi breed between 10-12 months age category and two other age categories. We concluded that measuring of physical body measurements, blood metabolites and GH, IGF-1 and Leptin genes in early ages is a good and accurate indicator for growth performance in Egyptian sheep breeds.

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“…Estimates of grand mean of body weight and body measurements are lower than those in the study of Gad, 2014. Different estimates probably due to breed differences as well as the feeding and management conditions under which the flock was maintained (Gad, 2014).…”

Section: Resultsmentioning

confidence: 99%

Prediction of Live Body Weight from Body Measurements Using Stepwise Regression Analysis in Sohagi Sheep

Elnahas

Elsayed

El-Shennawy

2017

Journal of Animal and Poultry Production

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This study aimed at predicting of live body weight from body measurements using stepwise regression analysis. Body measurements data of 212 animals, Sohagi sheep flock (64 male and 148 female) were used. Body weight (BW) and four body measurements were measured: heart girth (HG), height at withers (HW), height at rump (HR) and body length (BL). The stepwise regression analysis was performed in order to retain the X variable(s) (the body measurements) that contribute significantly (P < 0.05) to the variability in the dependent variable (BW). Results indicated that, there were high and positive correlation coefficients between the body weight and all body measurements. The highest correlation coefficient (r=0.93) was obtained between BW and HG and the lowest correlation coefficient (r= 0.88) was between BW and BL. All the studied body measurements were entered into the model and through stepwise elimination procedure two of them were considered unfit in the model (HR) and (BL). The two body measurements that best fit the model are heart girth (HG) and height at withers (HW), accounting for 92% of the live weight in Sohagi sheep. Changes of R 2 from the first model (R 2 =0.86, this model included HG only) to the third model (R 2 =0.92), explained that, the most important variable in predicting BW is HG. The standardized coefficient (Beta) is used to explain the contribution of each independent variable in the model. So, the most important variable is HG (Beta = 0.92), this variable is the most important variable to explain the variability in BW. The prediction equation explained that regression coefficient of BW/HG = 0.35, this means that when the heart girth increases by one unit (1cm), the live body weight increases by 0.35 kg in sohagi sheep.

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Estimation of Genetic Parameters for Body Measurements and Their Relationship With Body Weight in Barki Lambs

Cited by 6 publications

References 11 publications

Bayesian estimates of genetic parameters and genetic trends for morphometric traits and their relationship with yearling weight in Moghani sheep

Bayesian estimates of genetic parameters and genetic trends for morphometric traits and their relationship with yearling weight in Moghani sheep

Evaluation of Growth Performance, Blood Metabolites and Gene Expression Analysis in Egyptian Sheep Breeds, in Relation to Age

Prediction of Live Body Weight from Body Measurements Using Stepwise Regression Analysis in Sohagi Sheep

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