Emam, A., Mahmoud, B., El_Full, E., Semida, D. (2025). Effects of selection for fast growth rate on Japanese quail laying performance and fitness traits. Egyptian Poultry Science Journal, (), -. doi: 10.21608/epsj.2025.20980.1067
Ahmed Mohamed Emam; Bothina Yousef Mahmoud; Ensaf Ahmed El_Full; Doaa Abd-Elhamid Semida. "Effects of selection for fast growth rate on Japanese quail laying performance and fitness traits". Egyptian Poultry Science Journal, , , 2025, -. doi: 10.21608/epsj.2025.20980.1067
Emam, A., Mahmoud, B., El_Full, E., Semida, D. (2025). 'Effects of selection for fast growth rate on Japanese quail laying performance and fitness traits', Egyptian Poultry Science Journal, (), pp. -. doi: 10.21608/epsj.2025.20980.1067
Emam, A., Mahmoud, B., El_Full, E., Semida, D. Effects of selection for fast growth rate on Japanese quail laying performance and fitness traits. Egyptian Poultry Science Journal, 2025; (): -. doi: 10.21608/epsj.2025.20980.1067
Effects of selection for fast growth rate on Japanese quail laying performance and fitness traits
Articles in Press, Accepted Manuscript, Available Online from 19 May 2025
1Poultry Production Department,Faculty of Agriculture, Fayoum University, Fayoum, Egypt
2Poultry Production Department, Faculty of Agriculture, Fayoum University, Fayoum, Egypt.
Abstract
This work aimed to study the consequences of selection for fast growth rate on some laying and fitness performance in Japanese quail using 1157 females (706 for the selected line and 451 for the control line). The most important results obtained as follows: Selection generation significantly affected all egg studied traits indicating that the 4th generation (G4) had the earliest age at first egg (AFE) and age at the first ten eggs (AGE10) accompanied by the heaviest body weight at first egg (BWAFE) and desirably had lower days needed to produce the first ten eggs (DN10) and laid heavier average egg weight (AEWFM) (48.98, 60.87, 260.77, 13.12 and 11.88 respectively) and had higher number of eggs (ENFM), heavier egg mass for the first month of production (EMFM), and favorably lower pause duration length (PDLFM) than other generations being of 24.53, 291.32 and 1.76, respectively. Moreover, the G4 had higher fertility (88.20%) and hatchability (85.42%) associated with preferably lower early and late embryonic mortality% than other generations. The selected line attained AFE at earlier age (50.63 day) with heavier BWAFE (260.59g) and lower DN10 (14.06 day) and AGE10 (64.44 day), laid more ENFM (22.63egg), higher EMFM (263.67g), earlier age after first month of production (AGEFM, 80.63 day), larger clutch size (CSFM, 5.20) and shorter PDLFM (1.89 day) and had preferably higher fertility (80.69%), hatchability (74.14%) but undesirably higher early embryonic mortality% (2.68%) than those of the control line. Since selection for high growth rate during 1-21 days of age (GR1-21) resulted in favorable negative correlations with each of AFE, DN10, AGE10, PDLFM and AGEFM and had preferably positive rg’s with each of BWAFE, ENFM, EMFM, clutch number for the first month of production (CNFM) and CSFM, it seemed these traits can be indirectly improved through the selection for fast GR1-21.
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