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Present study was carried out to estimate the genetic and phenotypic parameters among external, internal egg quality traits and quality indices in Black and Brown Japanese quails. A total of 1218 eggs collected consecutively for three days at 16 weeks of age from 202 Black and 204 Brown Japanese quails were utilized in the present study to record the data on external and internal egg quality traits. The overall least squares means for EW, EL, EWD, SW, ST, AL, AWD, AH, AW, YD, YH, YW, YFC, SI, AI, YI and HUS were 13.63 g, 33.85 mm, 26.76 mm, 1.14 g, 0.21 mm, 42.63 mm, 33.45 mm, 5.04 mm, 7.95 g, 24.53 mm, 11.43 mm, 4.53 g, 5.66, 79.18, 0.13, 0.47 and 60.09, respectively. Majority of the heritability estimates for egg quality traits were within the range of moderate to high and suggested the existence of sizeable genetic variability for exploitation by appropriate selection procedure. [ABSTRACT FROM AUTHOR]

This research was carried out to determine the genetic parameters for some production traits. The overall least-squares means for body weights at day-old, 2nd and 4th week of age were 7.94, 59.20 and 141.64 g, respectively and average daily gains (ADGs) during 0-2, 2-4, 4-6, 6-8, 8-10 and 10-14 weeks of age were 3.66, 5.89, 3.69, 2.72, 1.51 and 0.46 g, respectively. Hatches, sexes and strains had significant effect on body weight and ADGs. The females were significantly heavier than the males. The heritability estimates for the body weights varied from low to high in Black, medium to high in Brown and low to medium magnitude in Black random bred, while these estimates for ADGs were low or moderate to high in magnitude. [ABSTRACT FROM AUTHOR]

Data on body weight at 4 weeks age, age at first egg and cumulative egg production up to 12, 16 and 20 weeks of age of a total 617 Black and Brown strains of Japanese quails were analyzed. Strains, generations and hatches had significant influence on all the traits studied. Black quails were significantly heavier and laid more eggs. The quails of fifth generation recorded lowest least-squares mean for age at first egg with higher egg production. Heritabilities varied from moderate to high in Black and were high in Brown strains. Genetic and phenotypic correlations among the traits varied from low to high. [ABSTRACT FROM AUTHOR]