Table 5.

In vivo hydrolysis of IP6 in different feed ingredients by exogenous phytase (data derived from Leske and Coon³²)

Ingredients	Total P (g kg−1)a	IP6 P (g kg−1)a	% IP6 P/total P	Hydrolysis of IP6 (%)		Increase		Total P retention (%)		Diff. (% points)	IP6-P releaseb by 100 FTU phytase	% IP6-P released by 100 FTU phytase
				− phytase	+ phytase	% points	IP-P release**	− phytase	+ phytase
Broilers
SBM	2.15	1.12	52.1	34.9	72.4	37.5	0.42	27	58	31.0	0.070	6.25
Corn	1.77	1.43	80.8	30.8	59	28.2	0.40	34.8	40.9	6.1	0.067	4.66
Rice bran	5.96	4.8	80.5	33.2	48	14.8	0.71	15.5	26.5	11.0	0.118	2.47
Canola meal	3.51	2.41	68.7	36.7	55.8	19.1	0.46	39.4	45.7	6.3	0.077	3.18
Barley	2.22	1.68	75.7	32.2	71.3	39.1	0.66	40.3	55.5	15.2	0.110	6.55
Wheat	2.22	1.98	89.2	30.7	46.8	16.1	0.32	16	33.8	17.8	0.053	2.69
Wheat midds	3.96	3.5	88.4	29.1	52.2	23.1	0.81	31.9	43.4	11.5	0.135	3.86
Laying hens
SBM	2.73	1.41	51.6	25.7	62.4	36.7	0.52	36.8	53.4	16.6	0.173	12.29
Corn	1.83	1.34	73.2	23	52	29.0	0.39	28.6	44.7	16.1	0.130	9.70
Rice bran	11.3	9.14	80.9	36.1	50.9	14.8	1.35	35.9	43	7.1	0.450	4.92

^aAnalyzed value in test diets as fed basis. Birds were placed in the cages and fed experimental diets for 3 days, then excreta were collected for 48 and 72 h for the broiler and layer trial, respectively.

^bIP6-P release, expressed as g kg⁻¹, is calculated as percentage increase in IP6-P hydrolysis multiplied by IP6-P content (g kg⁻¹) in the feed.