Crossbreeding parameters for growth traits in a complete three breeds diallel cross design of rabbits in Egypt

Abdel-Hamid, Tamer M.

doi:10.5455/javar.2015.b60

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…Highly significant differences were observed among different genotypes for almost all traits. In general, the crossbred rabbits were somewhat higher than the purebreds and they are within the range observed by [21,22,23,24,25]. However, the new rabbit line resulting from the crossing program called Egy-line proved to be superior in all different body weights and was the highest compared to the parents.…”

Section: 3genetic Groups and Comparisonssupporting

confidence: 51%

“…However, negative estimates were recorded for most of RGR. In contrast, NZW × Cal and RR crossbreeding, they showed negative estimates for all studied traits at most ages and age intervals [25]. Through the results of this study and other research, it is possible to improve growth traits by crossing.…”

Section: Direct (G I ) and Maternal Additive (G M ) Effectsmentioning

confidence: 55%

“…Estimates of direct (maternal) heterosis in grams were 29.1 (34.3), 61.4 (17.5), 69.7 (36.1), 98.6 (52.9), and 124.4 (74.8) for body weights at 4, 6, 8, 10, and 12 weeks of age, respectively. [25] noted that strong individual heterosis was estimated for NZW X Cal crossbreds for all body weights, especially at 6 th week of age (20.24%) and most of BWG, especially at 4-6 weeks of age (25.89%). However, negative estimates were recorded for most of RGR.…”

Section: Direct (G I ) and Maternal Additive (G M ) Effectsmentioning

confidence: 96%

“…Also, V line rabbits were significantly heavier in maternal genetic effects by 43.8, 46.4, 70.9, 78.5 and 81.6 g than Saudi Gabali at the same ages. Furthermore, both direct and maternal genetic effects were significantly heavier in daily gain weight by values ranging from 0.9 to 3.37 g at all age intervals studied [24,25] reported that the direct genetic effect of New Zealand White (NZW) was positive for all growth traits studied while the body weight (BW) at 8 th week, growth rate at 4-6 and at 6-8 weeks of age were negative, their values -37g,-64g,-1.62% and-4.71%, respectively. The estimates for Californian (Cal) breed were negative for all growth traits with the exception of BW at 4 th week and growth rate at 8-10, and at 10-12 weeks of age.…”

Section: Direct (G I ) and Maternal Additive (G M ) Effectsmentioning

confidence: 99%

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Genetic Evaluation of Growth Traits in New Synthetic Rabbit Line in Egypt

Abdel-Kafy¹,

El-Deighadi²,

Shabaan³

et al. 2021

OJAR

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Native Middle Egypt Rabbit breed (NMER) was crossbred with Gaint Flander rabbits to create a synthetic line. This study was aimed to evaluate the genetic estimates of this synthetic line with comparing to the purebreds. A crossbreeding was carried out by mating bucks of Gaint Flander (G) with does of NMER (N) to get F1 (½ N½ G), then does and bucks of F1 were mated to get F2 (½ N½ G)2, followed by two generations of inter se-mating to get a new synthetic line is called Egyline with a genetic structure of ((½ N½ G)2)2. Heritability estimates for body weights were generally moderate and ranged from 0.10 to 0.24, while the estimates of heritability for growth rate were low and moderate and ranging from 0.01 to 0.23. Common little effects of body weight were large as weaning (0.61), then declined gradually as the rabbit grew older. Also, the same trends were observed for relative growth rate (RGR). The direct additive effects were positive and highly significant for all body weights at different ages, favoring Gaint Flander and heavier comparing with NMER rabbits. Most relative growth rates during different intervals were non-significant. Gaint Flander was highly significant and heavier in maternal additive effects it in different weeks of age comparing with NMER rabbits. Direct heterosis effect for most bodyweight was positive and highly significant, and percentages of direct heterosis increased generally with the advance of age. Maternal heterosis for growth rates from 5 to 6, 8 to 10, and 10 to 12 week was positive, only. Direct recombination effects for most bodyweight were positive and highly significantly exclude weight at 5 and 6 weeks. It is concluded that a new synesthetic line (Egy-line) has proven its superiority and performance well in all different body weights and most growth rates compared to other parents and crossbreds.

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Section: 3genetic Groups and Comparisonssupporting

confidence: 51%

Section: Direct (G I ) and Maternal Additive (G M ) Effectsmentioning

confidence: 55%

Section: Direct (G I ) and Maternal Additive (G M ) Effectsmentioning

confidence: 96%

Section: Direct (G I ) and Maternal Additive (G M ) Effectsmentioning

confidence: 99%

See 2 more Smart Citations

Genetic Evaluation of Growth Traits in New Synthetic Rabbit Line in Egypt

Abdel-Kafy¹,

El-Deighadi²,

Shabaan³

et al. 2021

OJAR

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“…Crossbreeding is one of the fast tools offered to breeders to improve many qualities and to establish gains in the performance in farm animals [7] and to increase production, produce superior crosses and to combine different characteristics in which the crossed breeds were premium through the explosion of heterosis [8].…”

Section: Introductionmentioning

confidence: 99%

Impact of crossbreeding on performance traits in two breeds of rabbit under Egyptian conditions

Sakr

Radwan

El-Desoky³

et al. 2020

Mansoura Veterinary Medical Journal

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The objectives of this study were to investigate the effect of breed (V-Line and Baladi Black) on doe reproductive traits and their crossbreeding on litter traits and econom ic efficie ncy. Design: Random iz e d controlle d experim e ntal study. Procedures:A total of twenty adult females and six males from each breed with 2.75-3.00 kg of live body weight and 5-6 months of age were used. Experimental animals were divided into four groups (ten females and three males per each treatment). The first treatment was specified to V-Line males with V-Line females (V×V), the second treatment contained Baladi Black males with V-Line females (B×V), the third treatment had the V-Line males with Baladi Black females (V×B) and the fourth treatment contained the Baladi Black males with Baladi Black females (B×B). Within 12 hours after kindling, litters were checked and date of birth and number and weight of kits were recorded. The female was re-mated after 10 days from kindling. Young rabbits were weaned at five weeks of age and were transferred to the progeny cages with a group of five rabbits per cage. A total of 84 kids (twenty-one rabbits per genetic group) were fattened for about 9 weeks (from 5th to 14th weeks of age). Results: The results showed that breed had no significant effect on all reproductive traits, litter size and pre-weaning mortality rate at three stages of age (at birth, 21 day and 35 day). There were however, highly significant differences for litter weight and mean bunny weight at the same stages of age. Also, significant differences were detected for weight gain and average daily gain where the litter of V♂×V♀ genetic group outperformed other genetic groups. Significant differences among genetic groups were detected for economic measures; litter of V♂×V♀ genetic group recorded the highest values for total returns , net return and econom ic efficie ncy. Conclusion and clinical relevance:It could be concluded that purebred V Line (V♂×V♀) showed improvement in the litter traits and economic efficiency compared with the other genetic groups .

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