Emam, A. (2025). Evaluation of three growth curves models in two lines of Japanese quail in a selection experiment.. Egyptian Poultry Science Journal, (), -. doi: 10.21608/epsj.2025.52320.1128
Ahmed Mohamed Emam. "Evaluation of three growth curves models in two lines of Japanese quail in a selection experiment.". Egyptian Poultry Science Journal, , , 2025, -. doi: 10.21608/epsj.2025.52320.1128
Emam, A. (2025). 'Evaluation of three growth curves models in two lines of Japanese quail in a selection experiment.', Egyptian Poultry Science Journal, (), pp. -. doi: 10.21608/epsj.2025.52320.1128
Emam, A. Evaluation of three growth curves models in two lines of Japanese quail in a selection experiment.. Egyptian Poultry Science Journal, 2025; (): -. doi: 10.21608/epsj.2025.52320.1128
Evaluation of three growth curves models in two lines of Japanese quail in a selection experiment.
Articles in Press, Accepted Manuscript, Available Online from 19 May 2025
Poultry Production Department,Faculty of Agriculture, Fayoum University, Fayoum, Egypt
Abstract
This study was carried out at the Poultry farm of the Agricultural Experiments and Research Center, Faculty of Agriculture, Fayoum University. After eight generations, a total number of 598 Japanese quail chicks from the same hatch were used to investigate the influence of selection for high body weight at 28 days of age (BW28) on growth curve parameters under Gompertz, Richards and Logistic growth. Line significantly affected all studied body weights (BWs) except BW at hatch favoring selected line. Males had significantly higher BW7 and BW14 than females which had significantly higher BW42. The highest asymptotic weight parameter (β0) and relative growth rate (β2) values were observed in the selected line for both sexes compared to the control line. The selection program has affected clearly on increasing body weight and growth pattern in the selected line compared to the control line. The β2 values were higher in males under all models indicting that male birds have grown faster than females and reached earlier their weight at inflection point (IPW) and asymptotic weight. Regardless of growth model, both age at inflection point (IPT) and IPW values were higher in the selected line in both sexes than the control line. Females had higher IPT and IPW values than males reflecting that females reached mature weight after males. Selection for high BW28 modifies all studied growth curves and alter their parameters in both sexes favoring the selected line. Also, sexual dimorphism had a pronounced effect on studied growth curves. All studied models have considerably high and similar coefficient of determination (R2) values (close to 1) which ranged from 0.9938 to 0.9995. Gompertz was the best model for describing the growth pattern of females and males in both lines which had the lowest AIC, BIC, Mean square error (MSE) values and the highest R2.
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