Emam, A. (2025). SELECTION RESPONSES FOR AUGMENTING EARLY GROWTH RATE IN JAPANESE QUAIL. Egyptian Poultry Science Journal, (), -. doi: 10.21608/epsj.2025.57679.1137
Ahmed Mohamed Emam. "SELECTION RESPONSES FOR AUGMENTING EARLY GROWTH RATE IN JAPANESE QUAIL". Egyptian Poultry Science Journal, , , 2025, -. doi: 10.21608/epsj.2025.57679.1137
Emam, A. (2025). 'SELECTION RESPONSES FOR AUGMENTING EARLY GROWTH RATE IN JAPANESE QUAIL', Egyptian Poultry Science Journal, (), pp. -. doi: 10.21608/epsj.2025.57679.1137
Emam, A. SELECTION RESPONSES FOR AUGMENTING EARLY GROWTH RATE IN JAPANESE QUAIL. Egyptian Poultry Science Journal, 2025; (): -. doi: 10.21608/epsj.2025.57679.1137
SELECTION RESPONSES FOR AUGMENTING EARLY GROWTH RATE IN JAPANESE QUAIL
Articles in Press, Accepted Manuscript, Available Online from 19 May 2025
Poultry Production Department,Faculty of Agriculture, Fayoum University, Fayoum, Egypt
Abstract
Throughout a selection experiment, which extended over five generations: the base and four generations of selection for augmenting early growth rate (GR) during the period from hatch to 21 days of age in Japanese quail, a total number of 8724 birds were used: 1726 in the base population, 5176 for the selected line (HGR1-21) and 1822 for the control line. The most important results obtained as follows: Genetically, heritability (h2) for all body weights (BW) showed moderate h2 ranged from 0.19 to 0.29. The GR1-21 positively correlated with all body weights weekly measured except BW at hatch (BW1) with genetic correlations (rg) ranged from 0.06 to 0.47, and a wide range of phenotypic correlation (rp) ranged from 0.18 to 0.52. The GR during different periods of growth had medium h2 ranged from 0.17 to 0.28 and showed a wide range of moderate to high rg with the selection criterion (0.15 to 0.70) and had a broader range of rp ranged from 0.03 to 0.67. The HGR1-21 line in the 4th generation had the best growth performance for each of BW7, BW21 , BW28, GR during the periods 1-7, 1-14, 1-28 and 1-35 days of age. The realized cumulative response after four generations of selection was 0.063(6.30%) for GR1-21, the cumulative correlated responses for BW s and GR s ranged from 1.19,g to 23.94,g and from 3.10% to 17.00%, respectively. So, the current study aimed to evaluate the effectiveness of the selection program through estimation of direct and correlated responses to selection for fast GR1-21, and determination of correlations between selection criterion and either body weights at different ages or GRs during different growth periods for Japanese quail.
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