Table 5.

The effect of CP and available lysine level on nutrient digestibility and N balance of finishing male pigs (initial weight 39.1±2 kg)

	Lysine levels	Average CP (g/kg)					CP level				Lysine level		CP×lysine level
		144	155	168	182	193	SEM	p	p lin	p Qu	SEM	p	SEM	p
DM digestibility	6.9 lysine	0.804a	0.815abc	0.818bc	0.821bcd	0.833d	0.0033	<0.05	<0.01	NS	0.0022	NS	0.0043	<0.01
	8.2 lysine	0.825cd	0.811ab	0.812ab	0.822bcd	0.820bc
Energy digestibility	6.9 lysine	0.794a	0.804ab	0.808bc	0.811bcd	0.822d	0.0038	NS	<0.01	NS	0.0024	NS	0.0049	<0.01
	8.2 lysine	0.819cd	0.799ab	0.810bcd	0.813bcd	0.809bcd
Oil digestibility	6.9 lysine	0.730b	0.727b	0.699a	0.705a	0.693a	0.0071	<0.001	<0.001	<0.05	0.0058	NS	0.0091	<0.01
	8.2 lysine	0.785c	0.712ab	0.713ab	0.701a	0.691a
NDF digestibility	6.9 lysine	0.448	0.490	0.510	0.523	0.554	0.0088	<0.001	<0.001	<0.05	0.0072	NS	0.0118	NS
	8.2 lysine	0.444	0.464	0.510	0.510	0.498
CP digestibility	6.9 lysine	0.784	0.784	0.798	0.815	0.841	0.0062	<0.001	<0.001	<0.05	0.0047	NS	0.0086	NS
	8.2 lysine	0.811	0.783	0.808	0.818	0.822
Nitrogen intake (g/d)	6.9 lysine	39.6	43.4	47.7	50.0	53.1	1.02	<0.001	<0.001	NS	1.07	NS	1.47	NS
	8.2 lysine	37.7	45.2	46.5	52.2	53.3
Faecal N excretion (g/d)	6.9 lysine	8.6	9.4	9.6	9.2	8.5	0.37	<0.05	NS	<0.01	0.25	NS	0.51	NS
	8.2 lysine	7.1	9.8	9.0	9.5	9.5
Urinary N excretion (g/d)	6.9 lysine	6.7a	7.6ab	12.3d	13.2d	17.2e	0.50	<0.001	<0.001	NS	0.61	NS	0.61	<0.01
	8.2 lysine	6.4a	8.5bc	9.7c	12.9d	13.7d
Total N excretion (g/d)	6.9 lysine	15.3ab	17.1bc	21.9d	22.4d	25.8e	0.61	<0.001	<0.001	NS	0.69	NS	0.80	<0.05
	8.2 lysine	13.6a	18.3c	18.6c	22.2d	23.2de
Total N retention (g/d)	6.9 lysine	24.3ab	26.3abc	25.8abc	27.6cde	27.4cd	0.71	<0.001	<0.001	NS	0.51	NS	0.98	NS
	8.2 lysine	24.0a	26.9cd	27.9cde	29.6de	30.1e

^a,b,c,d,eSuperscripts indicate significance. Means within a row with common superscripts are not significantly different.

n = eight replicates/treatment. Each replicate = 1 pig.