Table 4.

Effects of clay supplementation on nutrient digestibility in growing-finishing pigs¹

Items	Level of clay (g/kg)				P - value
	0	3	6	SE2	Linear	Quadratic
Dry matter	0.77b	0.82 a	0.77 b	0.009	0.91	<0.01
Nitrogen	0.76 b	0.79 a	0.74 b	0.006	0.05	<0.01
Energy	0.81ab	0.83 a	0.78 b	0.013	0.13	0.04

Yan et al. [34]

^a,bValues significant at P<0.05 level

¹Clay comprised of 72.6 % SiO_2, 8.18 % AL₂O₃, 9.42 % Fe₂O₃, 5.25 % K₂O and minor amounts of other minerals