Table 7.

Effect of diet complexity and threonine supplementation on organ weights¹

	Complex		Simple			P-value2
Item	STD Thr	SUP Thr	STD Thr	SUP Thr	SEM	Diet	Thr	Diet × Thr
Empty BW	12.13	12.33	11.24	12.23	0.641	0.419	0.331	0.518
% of empty BW
Liver	4.15	3.58	3.40	3.65	0.223	0.116	0.454	0.062
Spleen	0.27	0.29	0.29	0.26	0.036	0.796	0.819	0.539
Kidneys	0.74	0.76	0.66	0.72	0.029	0.027	0.155	0.388
Stomach	0.88	0.80	0.81	0.85	0.051	0.893	0.644	0.199
Small intestine	4.26	4.42	4.33	4.59	0.203	0.562	0.281	0.790
Large intestine	1.66	1.73	1.96	1.91	0.168	0.140	0.945	0.714
Gastrointestinal tract3	6.81	6.95	7.09	7.35	0.283	0.205	0.462	0.834

¹STD Thr, the standard NRC (2012) level of SID Thr (0.79%); SUP Thr, 15% over the SID Thr requirement. Data represented as least square means of 7 to 9 pigs.

²Diet, main effect of diet complexity; Thr, main effect of the levels of dietary Thr supplementation; Diet × Thr, interactive effect of diet complexity and Thr supplementation.

³Stomach + small and large intestine.