| Titles |
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English :
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Improving some economic traits in Japanese quail by using different selection indices
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Arabic :
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تحسين بعض الصفات الاقتصادية في السمان اليابانى بأستخدام ادلة انتخابية مختلفة
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| Abstract |
The present study was carried out to construct three models of selection indices, general selection index, sub-indices and reduced indices to improve body weight at 6 wks of age and body weight gain from 2 to 6 wks of age as meat production traits and, age at sexual maturity and egg mass during first 90 days of age as egg production traits in Japanese quail. The data were collected from four generations. In the fourth generation, five hundred and sixty two females were obtained from 61 sires and 122 dams.
Results showed that, the heritability estimates of BW6, BG2-6 and EM were 0.67, 0.57 and 0.68 respectively, while low value was 0.28 for ASM. The genetic and phenotypic correlations between BW6 and BG2-6 were high and positive (0.33 and 0.78 respectively), while the genetic and phenotypic correlations were negative between ASM and each of BW6 , BG2-6 (-0.09, -0.08 and -0.08, -0.04 for each trait respectively).
The highest of regression values mean that these traits (BW6, BG2-6 and EM) were important in the general index or they are more effective in the general index than ASM trait.
The correlations between the index and each of BW6, BG2-6 and EM in the aggregate genotype were high and positive (0.591, 0.440 and 0.596, respectively), while the corresponding for ASM was negative (-0.222).
The efficiency of BW6 sub-index relative to the main index was the highest (66.84 %) of all sub-indices studied which indicated the most effective of this trait for selection index, while the efficiency of ASM sub-index relative to the main index was the lowest (5.15 %) of all sub-indices studied.
Net efficiencies of the reduced index were lower than the general index as its were 52.60 and 59.28% in relation to general index after omitting BW6 and focused BG2-6 (I6) and EM (I8), respectively.
Finally, the percent of gain of BW6, BG2-6, ASM and EM were 37.57, 31.87, 1.44 and 29.11%, respectively. These results indicated that the BW6 is the most important trait of economic-genetic than rest studied traits. The expected responses of selection index were 10.32 g for BW6, 8.45 g for BG2-6 , -0.58 day for ASM and 11.42 g for EM.
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| Publication year |
2007
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| Pages |
1275-1286
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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 |
Animal Production Research Institute (APRI)
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| City |
الاسكندرية
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| serial title |
Egyptian Poultry Science
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| ISSN |
1110-5623
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| Author(s) from ARC |
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| External authors (outside ARC) |
اميرة اسماعيل الدلبشانى
جامعة الاسكندرية
محمد بهى الدين محمد
جامعة الاسكندرية
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| Agris Categories |
Animal husbandry
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AGROVOC
TERMS |
Body weight.
Egg production.
Heritability.
Meat production.
Quails.
Weight gain.
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| Proposed Agrovoc |
economic traits;selection indices;general selection index;sub-indices;reduced indices;age at sexual maturity;egg mass;
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| Publication Type |
Journal
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