Effects Of Varying Metabolizable Energy And Crude Protein Concentrations On Production Performances Of Laying Quails At 15 To 19wk Of Age

The effects of ME and CP concentrations during laying phase of laying quails on their production performances were evaluated. In a 2×3 factorial arrangement, five hundred forty laying quails at 15 weeks of age were randomly assigned to experimental diets with 10.75MJ,11.25 MJ of ME/kg of diet; each contained 18.5%, 19.5%, and 20.5% CP, respectively, from 15 to 19 wk of age. Feed and water were provided ad libitum. The birds were observed for average feed consumption, egg weight, egg mass, feed conversion ratio, and laying rate at the end of experiment.Overall, the birds fed 11.25 MJ of ME/kg and 20.5% CP had lower feed consumption and feed conversion ratio (P<0.01) than other dietary treatments. Egg weight, egg mass, and average laying rate were higher (P<0.01) in birds fed 11.25 MJ of ME/kg than 10.75MJ of ME/kg dietary treatments, all so as well as fed 20.5% CP. The ME-CP interaction had little significant differences on feed consumption and feed conversion ratio (P>0.05). But The ME-CP interaction had very notable significant differences on egg weight, egg mass, and average laying rate (P<0.01).Thus, feeding 11.25 MJ of ME/kg and 20.5% CP of diet at 15 to 19 wk of age improved feed consumption, egg weight, egg mass, feed conversion ratio, and average laying rate of laying quails.