TABLE 1.

Composition and analyzed nutrient levels of experimental diets (as-fed basis).

Item	Groups
	Control	Treatment	Treatment	Treatment	Treatment
	group	I	II	III	IV
Ingredients %
DM	88.56	88.68	88.93	89.16	88.46
Corn	68.61	62.00	55.00	48.00	41.00
Wheat bran	15.4	15.80	16.15	16.67	17.21
Defatted rice bran (DFRB)	0.00	7.00	14.00	21.00	28.00
Soybean meal	13.3	11.70	10.40	8.95	7.50
Soybean oil	0.00	0.84	1.83	2.78	3.74
Lysine	0.03	0.04	0.03	0.03	0.03
Salt	0.30	0.30	0.30	0.30	0.30
Limestone	0.82	0.85	0.85	0.85	0.85
CaHPO4	0.75	0.68	0.65	0.63	0.58
Choline	0.04	0.04	0.04	0.04	0.04
Premix1	0.40	0.40	0.40	0.40	0.40
Nutrient level2
ME, MJ⋅kg–1*	12.13	12.13	12.22	12.27	12.31
CP %	15.60	16.67	16.13	15.73	16.40
EE %	5.19	5.08	5.32	5.27	5.38
NDF %	8.89	11.80	12.93	14.35	17.94
ADF %	5.53	6.25	6.53	7.08	8.13
IDF %	16.14	17.19	18.42	19.32	23.37
SDF %	0.52	0.56	0.68	0.73	0.82
TDF %	16.70	17.75	19.10	20.05	24.11
Cellulose %	4.06	4.43	4.71	5.09	5.79
Hemicellulose %	3.37	5.55	6.40	7.28	9.81
Lignin %	0.46	0.54	0.72	0.96	1.13
Calcium %	0.55	0.55	0.55	0.55	0.55
Available phosphorus %	0.27	0.27	0.27	0.27	0.27
L-lysine %	0.65	0.65	0.65	0.66	0.65
Methionine + cystine %	0.45	0.45	0.46	0.47	0.47

¹The premix was from Shanghai FuLangTe Animal Health Products Co., Ltd (Shanghai, China). The premix provided the following per kg of diets: vitamin A 8000 IU, vitamin D₃ 1 500 IU, vitamin E 100 mg, vitamin K₃ 4 mg, vitamin B₁ 2 mg, vitamin B₂ 8 mg, vitamin B₆ 3 mg, vitamin B₁₂ 0.04 mg, niacin 30 mg, pantothenic acid 35 mg, folic acid 0.6 mg, biotin 0.13 mg, Choline 150 mg, Fe 60 mg, Cu 5 mg, Zn 60 mg, Mn 10 mg, Se 0.15 mg and I 0.1 mg. ²DM, CP, EE, NDF, ADF, Hemicellulose, IDF, SDF, TDF, cellulose, and Lignin were measured values, while the other nutrient levels were calculated values.