Table 2 Formulation and proximate composition of the experimental diets (% dry matter basis).

Ingredients	FM	SBM	DAID
Fish meal^a	68	40.80	40.80
Soybean meal^b	0	37.90	37.90
α-Starch	16	11.55	11.546
Fish oil	4.80	6.70	6.70
Soy lecithin	0.50	0.50	0.50
Vitamin premix^c	1	1	1
Mineral premix^d	0.50	0.50	0.50
Choline chloride	0.30	0.30	0.30
Monocalcium phosphate	0.50	0.50	0.50
Ethoxyquin	0.05	0.05	0.05
Yttrium oxide	0.10	0.10	0.10
Calcium propionate	0.10	0.10	0.10
Cellulose	8.15	0	0
Daidzein^e	0	0	0.004
Sum	100	100	100
Proximate composition
Dry matter content	97.07	97.11	97.75
Crude protein	50.41	50.15	51.46
Crude lipid	9.52	10.29	10.10
Content of daidzein (μg/g)	Nd	35.89	62.87

FM fish meal diet, SBM soybean meal diet, DAID 40 mg/kg daidzein included into SBM diet, Nd no detected.
^a,bPurchased from Qingdao Seven Great Bio-tech Company Limited (Qingdao, China), Fish meal: crude protein, 74.04%; crude lipid, 9.97%; Soybean meal: crude protein, 53.12%; crude lipid: 2.12%.
^cVitamin mixture (mg kg⁻¹): VA, 32; VB1, 25; VB2, 45; VB6, 20; VB12, 10; Niacinaminde, 200; Inositol, 800; Calcium pantothenate, 60; VH, 60; Folate, 20; VE, 240; VK, 10; VC phosphate, 2000; VD, 5; Antioxidant, 3; Microcrystalline cellulose, 6470.
^dMineral mixture (mg kg⁻¹): Mg, 313; Fe, 79.10; Zn, 62.60; Mn, 46.60; I, 2; Se, 0.90; Cu, 6.40; Zeolite powder, 3485.
^ePurchased from Shanghai Macklin Biochemical Technology Co., Ltd., the purity was more than 98.051%.

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