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Genetic evaluation for carcass traits in some purebred and crossbred rabbits
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Abstract: This study carried out at the experimental rabbit farm, Department of Animal Production, Faculty of Agriculture, El-Azhar University, Nasr City Cairo, Egypt, during two consecutive years of production starting in September 2005 to August 2007. Data were recorded for 1332 males and females [305 of Californian (CAL), 253 of Baladi Red (BR) rabbits and their crosses at 14 weeks of age . The data were analyzed to estimate some genetic effects on carcass traits (Slaughter weight, SW; Hot carcass weight, HCW; Fore legs weight, FLW; Hind legs weight, HLW; Lion weight, LW and Dressing percentage, D%). The results obtained can be summarized as follows:
*Means of carcass traits studied were higher in CAL than in BR rabbits and they were 1985.3 gm for SW, 1259.2 gm for HCW, 261.2gm for FLW, 338.7gm LW, 396.4gm for LHW and 62.3 %)for D% for CAL rabbits, while they were 1788.3gm , 1078.4gm 242.0 gm, 282.6gm, 359.5 gm and 60.3 % for BR rabbits.
*Estimates of CV% for carcass traits studied ranged from 4.7 to 14.9% in CAL and from 8.6 to 16.3% in BR rabbits.
*Additive genetic effect in carcass traits studied among the two breeds of rabbits was positive and moderate, it ranged from 20.0 to 39.71 % in CAL and from 22.99 to 46.91% in BR rabbits.
*Variance for common litter effect was moderate and ranged from 18.0 to 36.0% in CAL rabbits and from 15.29 to 35.03% in BR rabbits.
*Heritability estimates ranged from 0.20 to 0.40 in CAL rabbits and from 0.23 to 0.47 in BR rabbits, it were higher for FLW, LW and HLW compared to SW, HCW and D%.
*Direct heterosis, was positive and significant for all carcass traits studied.
*Maternal heterosis estimates were positive and significantly affected carcass traits, it ranged from 2.7 to 6.7%.
*Direct additive effect was small and significant for SW, HCW and HLW but non-significant for the other carcass traits studied and favour of CAL-sired rabbits.
*Maternal additive effect was significant for SW, HCW, FLW and LW, but it was non-significant for D%, HLW and was mostly in favour of CAL-damed rabbits.
*Recombination effect was positive and significant for SW, HCW, FLW, LW and HLW, but non-significant for D%. These estimates ranged from 7.7 to 522.8.
Key words: Carcass, rabbits, slaughter, heritability, Animal model, Maternal heterosis, Recombination effect, direct additive.
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| Publication year |
2009
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| Pages |
25-34
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| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
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| Organization Name |
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| City |
مشتهر
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| serial title |
Annals Of Agricultural Science, Moshtohor
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| ISSN |
1110-0419
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| Author(s) from ARC |
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| External authors (outside ARC) |
جمال الدين يوسف عطالله
جامعة الازهر
محمد ابو الحسن احمد
جامعة الازهر
محمد منير شعبان مبروك
جامعة الازهر
محمود غريب غريب
جامعة الازهر
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| Agris Categories |
Animal husbandry
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AGROVOC
TERMS |
Animal models.
Carcass composition.
Crossbreds.
Genetic parameters.
Heritability.
Rabbits.
Slaughtering.
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| Proposed Agrovoc |
purebred;Maternal heterosis;Recombination effect;direct additive;
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| Publication Type |
Journal
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