Genetic parameters of growth traits and carcass weight of New Zealand white rabbits in a tropical dry forest area

Montes-Vergara, Donicer; Hernndez-Herrera, Darwin Yovanny; Hurtado-Lugo, Naudín

doi:10.5455/javar.2021.h536

Cited by 6 publications

(2 citation statements)

References 31 publications

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“…Moreover, these rabbits would be higher in carcass weight (r G = +0.50, +0.83 and +0.38, respectively) with an improvement in dressing percentage (r G =+0.10, +0.11 and +0.24, respectively) and muscle to bone ratio (r G = +0.09, +0.15 and +0.13, respectively). The same trend of associations was previously reported for carcass weight with weaning weight (Montes-Vergara, 2021) and with slaughter weight (Rotimi et al, 2021;Montes-Vergara et al, 2021;Montes-Vergara et al, 2020 andSam et al, 2020).…”

Section: Genetic and Phenotypic Correlationssupporting

confidence: 86%

Consequences of Selection for Post-Weaning Growth Performance on Carcass Attributes in Rabbits

Gouda

Shemeis

2022

Egyptian Journal of Rabbit Science

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The aim of this work is to investigate the consequences of selection for postweaning growth performance on carcass composition and carcass meatiness traits. Seven selection indices were applied using estimates of genetic and phenotypic parameters on 218 New Zealand White (NZW) rabbits, progeny of 24 bucks and 93 does, via a multi-trait animal model. Weaning weight (WW), Slaughter weight (SW) and daily gain between them (DG) were used as sources of information. The breeding objective was to enhance the profitability of NZW rabbit breeders by maximizing WW, SW, and DG. The carcass composition was represented as the percentage of dissected side weight deposited as muscle (MP), Fat (FP), and bone (BP), while carcass meatiness traits were represented as carcass weight (CW), dressing percentage (DP), muscle: bone ratio (MB), and muscle: fat ratio (MF). The heritability estimates (h2 ) were 0.69, 0.44 and 0.54 for WW, SW and DG, respectively. Carcass composition traits showed moderate estimates of h 2 for MP (0.31) and FP (0.35) and a very high value for BP (0.91). The h 2values for carcass meatiness traits were 0.42, 0.43, 0.89, and 0.75 for CW, DP, MB, and MF, respectively. The full index (I 1 ): I 1 = 6.39 WW -1.85 SW + 150.92 DG had the highest correlation with the aggregate genotype (r TI = 0.81), followed by the best reduced index involving WW and DG (r TI = 0.79): I 3 = 4.21 WW + 71.74 DG. However, the single trait selection index based on WW alone (I 5 = 4.46 WW) is expected to be as efficient as the best reduced index (r TI = 0.76). At each round of selection with the intensity of selection = 1.0, applying of I 1 , I 3 and I 5 are expected to result in developing NZW rabbits with better post-weaning growth performance in terms of heavier body weight at weaning (ranged from 112.93 to 121.35 gm) and slaughtering (ranged from 124.70 to 135.52 gm) with faster daily gain (ranged from 0.32 to 0.78 gm/day). This enhancement in postweaning growth performance is expected to consequence in an increase in MP (ranged from 0.67 to 0.82 unit) and FP (ranged from 0.31 to 60 GOUDA AND SHEMEIS 0.59 unit) and reduction in . Carcass meatiness traits are expected to be more favorable in terms of higher DP (ranged from 0.14 to 0.38 unit) and MB ratio (ranged from 0.28 to 0.36 unit) and less favorable in terms of MF (ranged from -0.23 to -1.60 unit). Conclusively, the results obtained in the present study suggested that selection based on the single trait index I 5 including the weaning weight trait would be recommended to improve the given aggregate genotype traits for being an early, single, and easy-to-measure.

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Section: Genetic and Phenotypic Correlationssupporting

confidence: 86%

Consequences of Selection for Post-Weaning Growth Performance on Carcass Attributes in Rabbits

Gouda

Shemeis

2022

Egyptian Journal of Rabbit Science

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“…Traditionally, pedigree information was commonly used to estimate the heritability of various traits in rabbits [45][46][47]. In this work, we investigated the impact of marker density on heritability estimates in order to estimate the stable heritability of growth and slaughter traits in meat rabbits (Figure 1).…”

Section: Appropriate Marker Density For Heritability Estimationmentioning

confidence: 99%

Marker Density and Models to Improve the Accuracy of Genomic Selection for Growth and Slaughter Traits in Meat Rabbits

Li,

Song

et al. 2024

Genes

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The selection and breeding of good meat rabbit breeds are fundamental to their industrial development, and genomic selection (GS) can employ genomic information to make up for the shortcomings of traditional phenotype-based breeding methods. For the practical implementation of GS in meat rabbit breeding, it is necessary to assess different marker densities and GS models. Here, we obtained low-coverage whole-genome sequencing (lcWGS) data from 1515 meat rabbits (including parent herd and half-sibling offspring). The specific objectives were (1) to derive a baseline for heritability estimates and genomic predictions based on randomly selected marker densities and (2) to assess the accuracy of genomic predictions for single- and multiple-trait linear mixed models. We found that a marker density of 50 K can be used as a baseline for heritability estimation and genomic prediction. For GS, the multi-trait genomic best linear unbiased prediction (GBLUP) model results in more accurate predictions for virtually all traits compared to the single-trait model, with improvements greater than 15% for all of them, which may be attributed to the use of information on genetically related traits. In addition, we discovered a positive correlation between the performance of the multi-trait GBLUP and the genetic correlation between the traits. We anticipate that this approach will provide solutions for GS, as well as optimize breeding programs, in meat rabbits.

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Genetic assessment of litter size, body weight, carcass traits and gene expression profiles in exotic and indigenous rabbit breeds: a study on New Zealand White, Californian, and Gabali rabbits in Egypt

Ayyat,

El-Monem,

Moustafa

et al. 2024

Trop Anim Health Prod

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Rabbits are essential for commercial meat production due to their efficient growth and productivity, breeds like New Zealand White (NZW), Californian (CAL), and Gabali (GAB) rabbits offer unique genetic traits in litter, growth, and carcass traits. This study aimed to evaluate heritability (h2), genetic and phenotypic correlations (rg and rp) for litter size, body weight and carcass traits across California (CAL), New Zealand white (NZW) and Gabali (GA) rabbits. Along with exploring gene expression profiles of TBC1D1, NPY, AGRP, POMC, Leptin, GH, GHR, IGF-1, CAA, GPR, ACC, CPT1, FAS, and CART in the brain, liver, and meat tissues of different rabbit breeds. The breed genotype had a significant impact on litter size (LS), litter weight (LW), body weight at 12 weeks (BW12), and daily weight gain (DWG) traits. NZW rabbits displayed superior performance in terms of litter size and litter weight, while CAL rabbits recorded the highest values for BW12 and DWG. Heritability estimates (h2) were generally low for litter size (ranging from 0.05 to 0.12) and medium for body weight (ranging from 0.16 to 0.31). Both genetic (rg) and phenotypic (rp) correlations for litter size were positive and moderate (ranging from 0.08 to 0.48), while correlations for body weight ranged from 0.21 to 0.58. Additionally, CAL rabbits exhibited higher carcass traits compared to NZW and GA rabbits. In terms of breed-specific gene expression patterns, New Zealand White (NZW) rabbits displayed the highest expression levels of key genes related to energy metabolism (TBC1D1), appetite regulation (NPY, AGRP, POMC), nutrient transport (CAA), and G protein-coupled receptors (GPR) in both brain and liver tissues. Californian (CAL) rabbits exhibited superior gene expression of the ACC gene in brain tissue and GH, GHR, and IGF-1 genes in brain and meat tissues. Gabali (GAB) rabbits demonstrated the highest expression levels of TBC1D1, NPY, AGRP, GPR, and ACC genes in meat tissues. These breed-specific gene expression differences, combined with genetic evaluation efforts, have the potential to enhance reproductive and productive performance in rabbits, offering valuable insights for rabbit breeding programs and genetic selection.

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Genetic parameters of growth traits and carcass weight of New Zealand white rabbits in a tropical dry forest area

Cited by 6 publications

References 31 publications

Consequences of Selection for Post-Weaning Growth Performance on Carcass Attributes in Rabbits

Consequences of Selection for Post-Weaning Growth Performance on Carcass Attributes in Rabbits

Marker Density and Models to Improve the Accuracy of Genomic Selection for Growth and Slaughter Traits in Meat Rabbits

Genetic assessment of litter size, body weight, carcass traits and gene expression profiles in exotic and indigenous rabbit breeds: a study on New Zealand White, Californian, and Gabali rabbits in Egypt

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