Growth analysis in CARI Uttam, CARI Sweta Japanese quails and their crosses using various model

The average body weight of male birds of CARI Uttam, CARI Sweta, CARI Uttam x CARI Sweta and CARI Sweta x CARI Uttam Japanese quail were 22.6±0.5 g, 22.2±0.5 g, 23.6±0.5 g and 22.7±0.5 g at 1^st week, respectively. The respective body weight at 10^th week were 210.52±1.9 g, 194.9±2.6 g, 218.8±2.3 g and 207.5±2.1 g. The corresponding average weight of female birds at 1^st week were 22.6 ± 0.4 g, 23.1 ± 0.4 g, 25.1 ± 0.6 g and 23.2 ± 0.6 g and attained 225.9 ±2.0 g, 216.1± 1.5 g, 229.3 ±2.2 g and 225.4 ± 2.6 g, respectively at 10^th week. The average body weights of these genotype differed significantly at all ages except 1^st week in males and 4^th week in females. Highest weight gain was observed during 5^th week of age. Growth models namely quadratic, modified exponential, logistic, Gompertz, modified logistic and Bertalanffy were fitted to the data on weekly body weights. Logistic model was found the best, to describe the growth pattern of all these genotypes on the basis of three measures of goodness of fit namely, R², mean square error and mean absolute error.