Table 3.

Analyzed enzyme activity in feed samples.

Treatment	Phytase, FTU/kg1			Xylanase, BXU/kg2			Protease, U/kg3
	Starter	Grower	Finisher	Starter	Grower	Finisher	Starter	Grower	Finisher
CON4	403	559	651	2,860	2,520	2,930	nd8	nd	nd
XYL5	551	382	463	21,800	22,800	20,700	nd	nd	nd
PRO6	577	483	352	2,870	3,580	2,830	9,000	7,400	7,000
SD PHY7	2,030	1,220	1,680	2,390	2,950	2,740	nd	nd	nd
XYL + PRO	534	499	730	23,700	23,700	21,700	7,500	6,300	7,000
XYL + SD PHY	1,790	1,280	1,540	23,500	25,500	17,800	nd	nd	nd
PRO + SD PHY	1,650	1,770	1,450	1,960	2,690	2,920	7,500	6,000	6,000
ALL	1,970	1,580	2,020	20,200	26,700	19,200	7,500	6,700	6,000

CON = control; XYL = xylanase; PRO = protease; PHY = phytase; SD PHY = superdosing phytase.

¹One FTU is defined as the amount of enzyme required to release 1 μmol of inorganic P per min from sodium phytate at 37 °C and pH 5.5.

²One BXU is defined as the amount of enzyme that produces 1 nmol reducing sugars from birchwood xylan in 1 s at 50 °C and pH 5.3.

³One U is defined as the amount of enzyme that produces small peptides and amino acids from casein in 1 min at 50 °C and pH 7.5.

⁴Expected activity 500 FTU/kg.

⁵Expected activity 16,000 BXU/kg.

⁶Expected activity 6,000 U/kg, based on product analysis and inclusion rate.

⁷Expected activity 1,500 FTU/kg.

⁸Below detection limit (2,000 U/kg).