Table 6.

Effect of protease and soybean meal source¹ on serum concentration of cytokines²

	Without protease		With protease4			P-value
Item	SBM 1	SBM 2	SBM 1	SBM 2	SEM	SBM source	Protease	SBM source × protease
IL-1-β, pl/mL	125.1	138.3	117.9	111.6	10.45	0.742	0.113	0.355
TNF-α, pl/mL	119.8	106.6	107.2	83.9	8.18	0.031	0.037	0.543
IL-13, pl/mL	1,906	4,069	2,673	2,231	936	0.364	0.570	0.172

¹SBM 1, soybean meal from Volga, SD; SBM 2, soybean meal from Beresford, SD.

²Data are means of 12 observations.

⁴Protease (ProAct, DSM Nutritional Products) supplied 15,000 units of protease per kilogram of diet.