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The aim of this study was to evaluate the effect of synbiotic on performance parameters, blood characteristics and carcass yields of Japanese quails fed diets containing different levels of protein. In a completely randomized design with 3 x 3 factorial arrangements, 720-day-old healthy Japanese quails were randomly allocated into 9 groups with 4 replicates of 20 chicks. Treatments consisted of combination of 3 levels of crude protein (CP): A) sufficient protein diet (24%, high CP) from 0 to 42 days of age; B) low protein diet (22.08%, low CP) from 0 to 42 days of age; C) sufficient protein diet from 0 to 21 days-low protein diet from 21 to 42 (medium CP) days of age and three levels of synbiotic, without, recommended and 150% of recommended levels, respectively. The results showed that there were no significant differences in feed conversation ratio, feed intake and body weight among treatments due to the interaction of CP and synbiotic levels. However, body weight and daily weight gain and feed conversation ratio improved (P<0.05) for bird fed medium and high CP compared with birds fed low CP in diet. The level of serum triglyceride decreased significantly (P<0.05) by adding different levels of synbiotic in diet. However, the effects of synbiotic supplementation on other blood parameters (cholesterol, total protein serum, uric acid, HDL and LDL) were not statistically significant among the groups (P>0.05). The effect of CP and synbiotic levels on the carcass yields of quail were not statistically significant (P>0.05)

1. The objective was to estimate heritability, genetic and phenotypic correlations for egg quality traits of Iranian native fowl at the Yazd Breeding Centre. 2. External and internal egg quality traits were measured on 1200 eggs from 794 hens of the 6th generation. A multivariate animal model with restricted maximum likelihood procedure was applied to estimate heritability, genetic and phenotypic correlations for egg quality traits using ASREML. 3. Heritability estimates for external egg quality traits ranged from 0·18 to 0·57 and for internal egg quality traits from 0·24 to 0·60. 4. For external egg quality traits, genetic correlation between egg weight and eggshell thickness (EST) was positive (0·36) and EST showed high genetic correlations with eggshell weight (0·84) and eggshell strength (0·55). This implies that heavier eggs tend to have thicker and stronger shells. 5. For internal egg quality traits, albumen height showed high positive genetic correlations with albumen weight (0·52), albumen index (0·98), yolk height (0·72) and yolk index (0·57). 6. Our results show that it is feasible to improve egg quality in Iranian fowl through selection for albumen height.

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