Table 2.

Composition and nutrient levels of experimental diets (air-dry basis).

Ingredients	Content, %	Nutrient levelsb	Content
Corn	79.67	Digestive energy, kcal/kg	3050.03
Soybean meal (46%)	15.33	Crude protein, %	15.54
Soybean oil	1.39	Crude fiber, %	2.32
CaHPO4	0.90	Crude fat, %	2.25
Limestone	0.95	Neutral detergent fiber, %	8.62
NaCl	0.50	Acid detergent fiber, %	3.09
Choline chloride (50%)	0.10	Moisture, %	13.54
L-Lysine hydrochloride	0.21	Ash, %	5.14
DL-Methionine	0.02	Ca, %	0.59
L-Tryptophan	0.03	TP, %	0.22
Premixa	0.90	SID Lys, %	0.83
Total	100	SID Met + Cys, %	0.49
		SID Thr, %	0.50
		SID Trp, %	0.17

^aThe premix provided the following per kg of diets: VA 12 400IU, VD₃ 2 800 IU, VE 30 IU, VK 5 mg, VB₁₂ 40 μg, VB₁ 3 mg, VB₂ 10 mg, nicotinic acid 40 mg, D-pantothenic acid 15 mg, folic acid 1 mg, VB₆ 8 mg, biotin 0.08 mg, CaI₂O₆ 0.92 mg, Na₂SeO₃ 0.77 mg.

^bNutrient levels were determined, except that digestible energy, SID Lys, SID Met, SID Thr, and SID Trp were calculated. The crude protein, crude fiber, crude fat, neutral detergent fiber, acid detergent fiber, moisture, ash, Ca, and TP were all determined according to the China National Standard, and the document numbers are GB/T 6432-2018, GB/T 6434-2006, GB/T 6433-2006, GB/T 20806-2006, NY/T 1459-2007, GB/T 6435-2014, GB/T 6438-2007, GB/T 6436-2002, and GB/T 6437-2018, respectively.