Impacts of varying dietary energy and crude protein levels on growth, carcase traits and digestibility coefficients of growing Japanese quail (Coturnix Coturnix Japonica) during the summer season

An experiment that included crude protein (CP) levels and metabolisable energy (ME) energy (Kcal/kg diet) in meat-type Japanese quail chicks was conducted to evaluate their impacts on performance, carcase traits, digestibility coefficients and nutritional value during the growing period. A total of 540 one-week-old (16.0 ± 0.60 g) Japanese quail chicks were randomly divided into nine treatment groups in a factorial experimental design (3 × 3), which included three levels of CP and ME (22, 24 and 26%) plus three levels of (2800, 2900, or 3000 Kcal ME/kg diet) during the summer season. The highest values of body weight at marketing age, daily weight gain and best feed conversion during all experimental periods were observed for chicks given 24% CP with a 3000 Kcal ME/Kg diet. A significant (P