Table 1. Experimental design of dietary treatments and nutritional levels (crude protein and phytase) for 1-week-old broiler chichens (n = 48)

Group	Crude protein (%)	Phytase (ppm)	Number of chicken	Description
HH	22	1,000	12	Control diet
HL	22	500	12	Reduced phytase only
LH	20	1,000	12	Reduced crude protein only
LL	20	500	12	Reduced crude protein and phytase

Group HH (22% crude protein, 1,000 ppm phytase) served as the control diet, whereas groups HL, LH, and LL represent diets with reduced phytase only (HL), reduced crude protein only (LH), and simultaneous reduction of both crude protein and phytase (LL), respectively.