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The foundation stock was established using fertilized eggs of three different colored strains brought from College of Agricultural Cairo University. The experimental flocks were hatched from 1500 eggs (500 of each Plumage group). The produced birds raised at the experimental farm, Department of Animal and Poultry Production, Faculty of Environmental Agricultural Sciences, Suez Canal University, El-Arish, North Sinai, Egypt, during the period from October 2011 to November 2012. Quail colored groups were: 1. The Wild Black type, Bl; 2. The Light Brown type, Br and 3. The White type, Wt (sometimes labeled with few colored short feather in their dorsal back and/or heads). Individual divergent selection for 4-wk-keellength was carried out. At 4 wk of age birds within each Color Plumage Type were descendingly sorted according to their keel length. The upmost 1/3 ranked birds, in each Color Plumage Type were considered as the high keel length selected line (H-line), while the lowest 1/3 ranked ones were considered the low keel length selected line (L-line). The rest of each respective group were considered as controls, C. The interaction between Plumage-Color and keel-length Types gave rise to 9 experimental groups as follows G1 = (Bl_H); G2 = (Bl_C); G3 = (Bl_L); G4 = (Br_H); G5 = (Br_C); G6 = (Br_L); G7 = (Wt_H); G8 = (Wt_C); G9 = (Wt_L).The experimental diet used was a single growing corn-soybean growing diet in a mash form with approximately 23% crude protein and 2850 kcal ME/kg. Feed and water offered ad libitum and all birds were treated the same. Results indicated that the interaction between keel selection type and birds color type was from significant to highly significant on all growth Traits. As for body weight (BW), the heaviest BW combination at all studied ages was the White -long -keeled birds (Wt-H line). The case was fluctuating as for the relative growth rate (RGR), the highest group was from the long-keeled birds but for the Whites, Wt_H at 2 wk and the Blacks, Bl_H at 4-6 wk. However for the superior 2-4 wk combination was the Black-short-keeled birds, (Bl_L) meanwhile for 6-8 wk it was for the Brown-shortkeeled birds, (Br_L).As regard to weight Gain (WG), the highest WG combination was for the long-keeled, (H line) birds. The highest WG in 0-2 wk and 0-8 wk represented for the White birds. However, the highest WG combination at 2-4 wk and 6-8 wk was achieved by the Browns. On the other hand the highest WG combination at 4-6 wk, was by the Blacks. For keelby colortypes interaction gave no substantial or noteworthy trend on various percentages of carcass components, there was no significant effect of this interaction on all carcass components except that for the right testis weight (where P< 0.0004).

IMPACT OF KEEL-LENGTH TYPE AND PLUMAGE INTERACTION ON JUVENILE GROWTH PERFORMANCE AND CARCASS COMPONENTS OF JAPANESE QUAILS