Variance Components and Response to Selection for Reproductive, Litter and Growth Traits Through a Multi-Purpose Index

Moura, Ana Silvia Alves Meira Tavares; Costa, André Luíz Mota da; Polastre, R.

doi:10.4995/wrs.2001.449

Cited by 12 publications

(5 citation statements)

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“…Heritability of the litter weight at day 21 was moderately low, varying between 0.08 and 0.17 depending on the parity. Similar values were reported by other authors (Ayyat et al, 1995;Lukefahr and Hamilton, 1997;Rastogi et al, 2000;Moura et al, 2001).…”

Section: Additive Genetic Componentssupporting

confidence: 92%

“…In the P breed we observed negligible genetic trends for number of kits born alive (0.01), but this finding can be explained by the fact that this line was not selected for litter size. Moura et al (2001) and Santacreu et al (2005) reported similar values (0.03-0.05 kit/yr), Garreau et al (2005), Baselga (2002a, 2002b) and Lenoir and Garreau (2009) obtained much larger genetic trends (0.12 kit/yr). In the M line, after 10 yr the litter size will only increase by 0.3-0.4 kits.…”

Section: Genetic Trendsmentioning

confidence: 65%

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Pannon breeding program in rabbit at Kaposvár University

et al. 2014

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In this study, the rabbit breeding programme conducted at the Kaposvár University is extensively discussed. Population history and recorded traits, creation of the different synthetic lines, evolution of their selection criteria, estimation of the genetic parameters and genetic trends are the main elements described. The programme (Pannon rabbit breeding programme) is operated with 1 maternal line and 2 paternal lines. At present the maternal line (Pannon Ka) is selected for number of kits born alive, while the 2 paternal lines are pre-selected for litter weight (Pannon White) and average daily gain (Pannon terminal line), respectively, then they are both selected for thigh muscle volume (based on computer tomography (CT) measurements). All these traits are evaluated by BLUP methodology. According to the genetic parameter estimations, the heritability of the reproductive traits (litter size and litter weight) was low (0.05-0.17 and 0.08-0.17). When the litter size component traits were extended with dominance effects, the magnitude of the dominance components varied between 0.05 and 0.08. Average daily gain and thigh muscle volume were moderately heritable (0.21-0.27 and 0.19-0.25), while heritability estimates of the carcass traits (dressing out percentage and hind part ratio) were high (0.47 and 0.59). Computer tomography based traits showed favourable high genetic correlations with the carcass traits (dressing out percentage: 0.45-0.47 and hind part ratio: 0.59). On the contrary, strong negative correlation was estimated between thigh muscle volume and litter weight (-0.37 and -0.70). The selection responses obtained for all analysed traits were within the range published by the relevant literature. The success of the CT-based selection for improving meat production was justified by different methods (crossing experiment, divergent selection, estimated genetic trends). In addition to the slow increase in the inbreeding level of the Pannon White breed, it also proves the effectiveness of the circular mating scheme used in all three rabbit breeds in the programme.

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Section: Additive Genetic Componentssupporting

confidence: 92%

Section: Genetic Trendsmentioning

confidence: 65%

Pannon breeding program in rabbit at Kaposvár University

et al. 2014

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“…The response of 9.57g and 10.33g for body weight in generation one and two respectively in males was lower than 49.8 g/d and 45.9 g/d reported by Piles and Blasco (2003) on the growth rate of rabbits. Moura et al (2001) also reported 17.2 g in rabbits. The observed values of 14.54g and 1.85g for body weight in generations one and two in females were higher than 0.6 g/d for average daily gain reported by Szendro et al (1992).…”

Section: Selection Response Of the Breedsmentioning

confidence: 88%

Response to Selection for Body weight and Linear Body Traits in Breeds of Rabbit

Eshimutu,

Nwagu,

Kabir

2023

AKSUJA

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An assessment of the selection response of body weight and linear body traits in breeds of rabbit in Zaria, Kaduna State, Nigeria was conducted. A population of 48 matured rabbits consisting of three breeds; New Zealand white, Chinchilla and Dutch was used in the experiment. Each breed represented a treatment group and was used to generate 288 rabbits in a nested design. The populations were selected at six weeks of age in all the generations. The growth traits considered were; body weight, ear length, nose to shoulder, body length, length of back leg, thigh length, and heart girth and thigh circumference. Data generated were subjected to analysis of variance using the SAS software. The New Zealand White had a higher body weight of 1157.92±22.75g and 1229.35±24.07g in generations one and two respectively, and heart girth of 20.09±0.14cm, thigh length of 15.93±0.09cm, body length of 44.52±0.48cm and thigh circumference 10.96±0.09cm in generation one. The length of back legs and heart girth in generation two were better expressed in Chinchilla and Dutch breeds, respectively. The selection response range was 19.45 - 22.20kg and 13.59 - 14.95kg in males and females respectively for body weight while the linear body traits ranged from 0.01 - 0.30cm and 0.01 - 0.28cm for males and females respectively in New Zealand white. For chinchilla, responses to selection for body weight were 9.45-10.33kg and 1.85 - 14.54kg for males and females respectively while linear body traits ranged from 0.01- 0.33cm for both males and females. The response to selection for body weight in Dutch ranged from 7.48 - 27.40kg and 18.38 - 18.66kg for males and females respectively, whereas for the linear body traits the range was 0.01 - 0.34cm and 0.02 - 0.40cm for males and females respectively. It was observed that the Dutch genotype had the best selection progress for body weight and linear body traits and therefore recommended for improvement of body weight and linear body traits

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“…), phenotypic variation coefficients (CV%), heritability estimates (h 2 ±SE) and calculated economic values (a) of post-weaning growth traits and carcass attributes et al, 2012;Garreau et al, 2008;Moura et al, 2001). The h 2 -estimates for carcass compositional traits indicated that the percentage of carcass weight deposited as bone (BP) was more heritable (0.91) than that deposited as muscle (MP = 0.31) or fat (FP = 0.35).…”

Section: Variability and Heritabilitymentioning

confidence: 99%

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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Variance Components and Response to Selection for Reproductive, Litter and Growth Traits Through a Multi-Purpose Index

Cited by 12 publications

References 0 publications

Pannon breeding program in rabbit at Kaposvár University

Pannon breeding program in rabbit at Kaposvár University

Response to Selection for Body weight and Linear Body Traits in Breeds of Rabbit

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

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