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Heterosis from line crosses of two selected lines of japanese quail: і- genetic variance components [electronic resouce].

By:

Abou El-Ghar, R. Sh

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Language: English Summary language: Arabic Description: p.1487-1496Other title:

قوة الهجين الناتجة عن الخلط بين خطان منتخبان من السمان الياباني: 1- مكونات التباين الوراثي [Added title page title]

Uniform titles:

Egyptian poultry science journal, 2006 v. 26 (IV) [electronic resouce].

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In: Egyptian Poultry Science Journal 2006.v.26(IV)Summary: The statistical methods for estimating the variance components based on examination of F2 and backcrosses of a cross between two selected lines of Japanese quail (one was selected for increase egg production and the other was selected for high 6-wk body weight) were used for some productive traits. The aim was to understand the genetic basis of the studied traits. Insignificant additive genetic variances (σ²A) were estimated being 0.0026, 0.2358, 1.7432, 2.0882, 2.066, 4.271, 0.3424 and 0.0032 for body weights at hatch (W0), 2 weeks (W2), 4 weeks (W4), 6 weeks of age (W6), body gain from 2-6 weeks of age (BG2-6), body weight at sexual maturity (BWSM), age at sexual maturity (ASM) and egg weight (EW), respectively. Significant additive genetic variances 0.5175 and 59.6 were estimated for egg number (EN) and total egg mass (EM) at the 1st 90 d of production, respectively. The dominance genetic variances (σ²d) for all the studied traits appear to be larger than additive ones. Significant dominance genetic variances (27.8092, 19.0929 and 36.0387) were found for W2, BG2-6 and ASM, respectively. Otherwise, the significant epistatic relations such as additive x additive type of epistatic variances ( σ²i ) were 0.246 and 16.803 for W0 and BG2-6, respectively. While the significant additive x dominance gene interaction variances (σ²j) were 1.7972, 2.9184, 2.7015 and 88.1 for W4, W6, BG2-6 and EM, respectively. Also, the significant dominance x dominance gene interaction variances (0.067, 44.5755, 2.435, 110.902 and 0.0822) were estimated for W0, W4, W6, body weight at sexual maturity and EW, respectively. These results suggest that selection would be effective for both egg number and total egg mass, and crossing would be effective for improving the rest of the studied traits.

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The statistical methods for estimating the variance components based on examination of F2 and backcrosses of a cross between two selected lines of Japanese quail (one was selected for increase egg production and the other was selected for high 6-wk body weight) were used for some productive traits. The aim was to understand the genetic basis of the studied traits. Insignificant additive genetic variances (σ²A) were estimated being 0.0026, 0.2358, 1.7432, 2.0882, 2.066, 4.271, 0.3424 and 0.0032 for body weights at hatch (W0), 2 weeks (W2), 4 weeks (W4), 6 weeks of age (W6), body gain from 2-6 weeks of age (BG2-6), body weight at sexual maturity (BWSM), age at sexual maturity (ASM) and egg weight (EW), respectively. Significant additive genetic variances 0.5175 and 59.6 were estimated for egg number (EN) and total egg mass (EM) at the 1st 90 d of production, respectively. The dominance genetic variances (σ²d) for all the studied traits appear to be larger than additive ones. Significant dominance genetic variances (27.8092, 19.0929 and 36.0387) were found for W2, BG2-6 and ASM, respectively. Otherwise, the significant epistatic relations such as additive x additive type of epistatic variances ( σ²i ) were 0.246 and 16.803 for W0 and BG2-6, respectively. While the significant additive x dominance gene interaction variances (σ²j) were 1.7972, 2.9184, 2.7015 and 88.1 for W4, W6, BG2-6 and EM, respectively. Also, the significant dominance x dominance gene interaction variances (0.067, 44.5755, 2.435, 110.902 and 0.0822) were estimated for W0, W4, W6, body weight at sexual maturity and EW, respectively. These results suggest that selection would be effective for both egg number and total egg mass, and crossing would be effective for improving the rest of the studied traits.

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