Estimation of dominance effects for reproductive, growth and carcass traits of Pannon White rabbits

Nagy, István; Kövér, György; Farkas, J.; Szendrő, Zsolt; Čurik, Ino

doi:10.5513/jcea01/20.2.2553

Cited by 2 publications

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“…On the contrary, Moustafa et al [ 38 ] found higher values of 0.47 and 0.33 for WW and SW, respectively. The found value of h 2 for CW is considered low, and a similar value was reported previously [ 39 ]. Superior reports have been mentioned by Hervé et al [ 40 ].…”

Section: Resultssupporting

confidence: 88%

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

2021

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Objective: The objective of this study was to estimate the heritability ( h 2 ), repeatability ( r ), and correlations ( r ŷ i y i ) in some traits of zootechnical interest in a population of New Zealand white rabbits of a tropical dry forest area. Materials and Methods: Three mating groups were formed, each one of 1 male and 70 females. The traits evaluated were litter size at birth (LB), born alive (BA), born dead (BD), litter weight born alive (LW), litter weight at weaning (LWW), weaning weight (WW), slaughter weight (SW), and carcass weight (CW). Weaning took place at 42 days, and the fattening phase lasted 60 ± 3 days. A descriptive statistical study was carried out on the study variables. Paternal heritability was estimated ( ) and maternal ( ), repeatability, rabbit index IC, and Pearson’s correlations ( r ŷ i y i ) between traits. The descriptive statistics showed high variation for the BD traits. Results: The values of the productivity found were similar to those presented in studies around the world. h 2 presented magnitudes between low and medium. ranged between 0.09 and 0.42 and between 0.11 and 0.45 for . In general, the values of were higher than the values of . The r values for the traits LB, BA, LW, LWW, and SW presented low magnitude, while it was medium for WW and CW. From the values of r , IC was calculated for each of the rabbits, allowing their categorization, which will be used in future selection plans. r ŷ i y i among the variables ranged from −0.01 to 0.860. They were generally positive and mostly not significant ( p > 0.05); they took a magnitude from low to moderate, except for the correlation between LB and BA. Conclusion: The production of rabbits under tropical conditions is similar to other reports. The genetic parameters evaluated were medium-to-low, indicating a robust non-additive gene and/or environmental effect.

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Section: Resultssupporting

confidence: 88%

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

2021

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“…The estimates of heritability for carcass meatiness traits being 0.42 for CW, 0.43 for DP, 0.89 for MB and 0.75 MF. However, the present estimate of h 2 for CW is higher than the estimates reported previously (Montes-Vergara, 2021 and Nagy et al, 2019). In agreement with the literature (Garreau et al, 2008 andLarzul, et al, 2005), the dressing percentage was shows to be moderates heritable.…”

Section: Variability and Heritabilitysupporting

confidence: 88%

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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Estimation of dominance effects for reproductive, growth and carcass traits of Pannon White rabbits

Cited by 2 publications

References 6 publications

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

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

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

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