Genetic Parameters for Post-Weaning Growth Traits of Gabali Rabbits in Egypt

Soliman, Hatem; Gad, Sawsan M.; Esmail, I

doi:10.21608/epsj.2014.32587

Cited by 3 publications

(10 citation statements)

References 4 publications

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“…These tendencies are in agreement with results reported by (Iraqi, 2008 andSoliman et al, 2014) , and percentages of c 2 in this study were higher than those reported by (Gad, 2007) with Gabali rabbits for body weight at4, 8 and 12 weeks of age, which were 15%, 28% and 25%, respectively. (Iraqi, 2008, Youssef et al, 2009and Soliman et al, 2014 reported also that the common-litter effect is very important for post-weaning growth traits, and one can conclude that the common-litter effect should be included in the genetic evaluation of breeding programs. Estimates of error proportions e 2 for body weights were higher with advanced of age and the percentage were 20%, 37%, 40%, 48% and 60% at 4, 6, 8, 10 and 12 weeks of age.…”

Section: Common-litter Effect (C 2 )supporting

confidence: 93%

“…The low and moderate heritability estimates obtained in the present study could be explained by a small amount of genetic variability in the population and the moderate standard of hygiene and the uniformity of the environment (El-Raffa, 1994) and these moderate heritability estimates at 6 and 8 weeks indicated that they response to selection promising. The moderate heritability estimates obtained in the present study were similar to those estimates obtained in some studies in Egypt (Gomez et al, 2000;Khalil et al, 2000;Iraqi et al, 2002, Iraqi, 2003Gad, 2007 andSoliman et al, 2014). The low heritability estimates at 4, 10 and 12 weeks were similar to those estimates reported by Ferraz et al, 1992and Lukefahr et al, 1996.…”

Section: Heritabilitysupporting

confidence: 91%

“…Prior to computing the complete index, the relative economic values (REV) were calculated depending on the phenotypic standard deviation where, REV=1/σp where σp is the phenotypic standard deviation of the trait, according to Sharma andBasu 1986 andFalconer andMackay, 1996 using Minitab programs. RESULTS AND DISCUSSION Means, standard deviations, coefficients of variability for body weight traits in Sinai Gabali rabbits are given in Table 1 to characterize phenotypically the population used. Means of body weights of Gabali rabbits ranged from 604.4 g at 4 weeks of age to 2019.9 g at 12 weeks of age, these means are relatively high to those reported by (Gad, 2007;Iraqi, 2008 andSoliman et al, 2014).…”

Section: Materials and Methods Animals And Datamentioning

confidence: 49%

“…Fortunately, the obtained estimates of heritability and most of the genetic correlation coefficients were high; letting one's expects that if they were used in a breeding plan that would be effective to this breed to be improved somewhat rapidly. Common-litter effect is expected to be important for postweaning traits; therefore, it is included in the genetic evaluation of any suggested breeding programs (Iraqi, 2008;Youssef et al, 2009 andSoliman et al, 2014). Among various methods of selection, when the objective of the breeding programme is to improve several characters, the most efficient way of using the available information is usually to construct a selection index which is considered to be the most efficient method (Choudhury and Goswami, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Selection Indices for Improving Body Weight in Gabali Rabbits.

El-Deghadi

2018

EPSJ

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Selection indices were constructed for improving body weight in Gabali rabbits, utilizing records of 515 progenies born from 29 does and 8 sires for four consecutive years. The statistical analysis was carried out using a multi trait animal model to estimate additive, common-litter and residual effects' variances. The adopted model included fixed (the effects of season, parity and litter size at birth) and random effects (additive genetic and common-litter effects) for post-weaning growth traits. Means of body weights of Gabali rabbits ranged from 604.4 g at 4 weeks of age to 2019.9 g at 12 weeks of age. Estimates of h 2 were 0.06, 0.18, 0.26, 0.11 and 0.10 for individual body weight at 4 th , 6 th , 8 th , 10 th , and 12 th weeks of age, respectively. The estimate of common-litter effects (c 2) for body weight at weaning was higher compared with other ages. Estimates of rG were high and positive for all possible/attained genetic correlations between body weights at various ages (ranged from 0.37 to 0.91). Selection indices were constructed incorporating the Gabali rabbits body weights at five different ages; body weight at 4 th (X1), 6 th (X2), 8 th (X3), 10 th (X4) and 12 th (X5) weeks of age; respectively. In all indices the values of b's for individual traits varied from one index to another and were even, low, moderate to high plus negative in some and positive in other indices. On the basis of relative efficiency of the indices (RIH), the following four indices were recommended for sake of maximizing genetic response to selection. Index no. Values of b RIH I14-0.5195 X2 + 0.6460 X3 0.633 I9 0.8293 X3-0.7570 X4 + 0.2950 X5 0.597 I11-0.1036 X1 + 0.2854 X3 0.504 I17 0.4562 X3-0.1689 X4 0.496 Expected genetic gain changes in each trait varied a lot from one index to the other. Yet, though RIH in some of the indices were found negative while positive in the others in the best indices, expected genetic changes of various traits were all positive. Standard deviation the aggregate of the genotypic (σ H) estimates were moderate or high and the heritability values for I14, I9, I11 and I7 indices were 0.21, 0.29, 0.15 and 0.25 respectively,

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Section: Common-litter Effect (C 2 )supporting

confidence: 93%

Section: Heritabilitysupporting

confidence: 91%

Section: Materials and Methods Animals And Datamentioning

confidence: 49%

Section: Introductionmentioning

confidence: 99%

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Selection Indices for Improving Body Weight in Gabali Rabbits.

El-Deghadi

2018

EPSJ

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“…Growth traits are important factors which affect the profitability of meat production (Soliman et al, 2014). Also, body weight is an important economic character in the commercial rabbit industry.…”

Section: Animal and Poultry Productionmentioning

confidence: 99%

Productive and Reproductive Traits Improvement of the Egyptian Local Strain Rabbits by the Crossing With Two Foreign Strains

2017

Zagazig Journal of Agricultural Research

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The numbers of 1317 parities were analyzed to evaluate crossing effects among three breeds of rabbits. The tested breeds were New-Zealand White (NZW), Chinchilla (Ch) and Gabali (G). An incomplete dialed crossing mating design excluding the two reciprocal crosses between the two foreign breeds (♀Chx♂NZW, ♀NZWx♂Ch) was adopted. The traits studied were litter size (LS) at birth (LSB), litter size at 21 days (LS21) and litter size at weaning (LSW), litter weight (LW) at birth (LWB), litter weight at 21days (LW21) and litter weight at weaning (LWW). As well as, growth traits involved: individual body weight (BW) at 4 (BW4), 6 (BW6), 8 (BW8), 10 (BW10) and 12 (BW12) weeks of age. In addition, heterosis (H I) was estimated for all traits studied. Effect of mating type was significant (P < 0.05) for LS, LW and BW traits. In purebreeds, G rabbits recorded the highest value of each (P < 0.05) LSB, LS21 and LSW (7.3, 5.9, and 5.8, respectively). In crossbreed, results showed that ♀Gx♂Ch recorded the highest value of each LSB, LS21 and LSW (7.5, 6.1, and 5.9, respectively). With respect to LW traits, in purebred rabbits, G recorded the highest LWB (411.9 g), while NZW recorded the highest LW21 and LWW (1745.4 and 2824.4 g, respectively). In crossbreeds, ♀Gx♂Ch showed the highest LWB (394.2 g), while ♀NZW x♂G recorded the highest LW21 and LWW (1836.5, 2917.1 g, respectively). ♀ New Zealand White x ♂Gabali rabbits and ♀Chx♂G rabbits recorded negative and non-significant estimates of heterosis (%) for LS and LW traits. Individual body weight traits were significantly influenced by mating type during the different ages. Both ♀NZWxG♂ and ♀ChxG♂ rabbits recorded positive and significant estimates of heterosis (%) for BW traits. Based on the results of the present study, it could be concluded that crossing between G does and Ch bucks improved LS and/or LW traits. Also, crossing between G bucks and NZW does improved growth traits, LWB and LW21.

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Genome-Wide Association Studies for Growth Curves in Meat Rabbits Through the Single-Step Nonlinear Mixed Model

Liao

Wang

Glória³

et al. 2021

Front. Genet.

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Growth is a complex trait with moderate to high heritability in livestock and must be described by the longitudinal data measured over multiple time points. Therefore, the used phenotype in genome-wide association studies (GWAS) of growth traits could be either the measures at the preselected time point or the fitted parameters of whole growth trajectory. A promising alternative approach was recently proposed that combined the fitting of growth curves and estimation of single-nucleotide polymorphism (SNP) effects into single-step nonlinear mixed model (NMM). In this study, we collected the body weights at 35, 42, 49, 56, 63, 70, and 84 days of age for 401 animals in a crossbred population of meat rabbits and compared five fitting models of growth curves (Logistic, Gompertz, Brody, Von Bertalanffy, and Richards). The logistic model was preferably selected and subjected to GWAS using the approach of single-step NMM, which was based on 87,704 genome-wide SNPs. A total of 45 significant SNPs distributed on five chromosomes were found to simultaneously affect the two growth parameters of mature weight (A) and maturity rate (K). However, no SNP was found to be independently associated with either A or K. Seven positional genes, including KCNIP4, GBA3, PPARGC1A, LDB2, SHISA3, GNA13, and FGF10, were suggested to be candidates affecting growth performances in meat rabbits. To the best of our knowledge, this is the first report of GWAS based on single-step NMM for longitudinal traits in rabbits, which also revealed the genetic architecture of growth traits that are helpful in implementing genome selection.

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Genetic Parameters for Post-Weaning Growth Traits of Gabali Rabbits in Egypt

Cited by 3 publications

References 4 publications

Selection Indices for Improving Body Weight in Gabali Rabbits.

Selection Indices for Improving Body Weight in Gabali Rabbits.

Productive and Reproductive Traits Improvement of the Egyptian Local Strain Rabbits by the Crossing With Two Foreign Strains

Genome-Wide Association Studies for Growth Curves in Meat Rabbits Through the Single-Step Nonlinear Mixed Model

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