Table 7.

Relationship between true protein digestibility and the amount of the dietary protein contributed by whole grains or protein fractions (expressed as dry matter) in feline foods.

Feline	Rice				Corn				Soy
	Whole Rice (n =341)		Rice Protein Concentrate (n = 12)		Whole Corn (n = 107)		Corn Gluten Meal (n = 242)		Soybean Meal (n = 23)		Soybean Protein Isolate (n = 19)
	Intercept	Slope	Intercept	Slope	Intercept	Slope	Intercept	Slope	Intercept	Slope	Intercept	Slope
coefficient	95.7	−0.16	96.4	−0.043	94.6	0.028	92.2	0.093	93.7	−0.014	95.5	0.069
std error	0.283	0.068	2.576	0.066	0.666	0.2	0.52	0.014	1.294	0.25	0.979	0.048
T τ	337.8	−2.3	37.4	−0.646	142.1	0.139	177.3	6.471	72.4	−0.056	97.6	1.433
p >|t|	<0.001	0.02	<0.001	0.533	<0.001	0.89	<0.001	<0.001	<0.001	0.956	<0.001	0.17

^τ Student’s t value.