Table 5.

Basal endogenous losses (gram per kilogram dry matter intake) of amino acids from pigs fed the N-free diet at four universities¹

Item	Universities				Mean	SD	Station
	A	B	C	D			SEM	P-value
Observation, n	6	5	5	5	—	—	—	—
Crude protein	30.23	26.36	26.23	16.31	24.78	5.94	5.88	0.404
Indispensable amino acids
Arg	1.23	1.22	0.39	0.59	0.86	0.43	0.33	0.191
His	0.24	0.19	0.15	0.18	0.19	0.04	0.02	0.075
Ile	0.43a	0.33ab	0.30b	0.30b	0.34	0.06	0.03	0.024
Leu	0.73a	0.49b	0.47b	0.51b	0.55	0.12	0.05	0.003
Lys	0.50	0.69	0.58	0.38	0.54	0.13	0.11	0.302
Met	0.11	0.08	0.09	0.09	0.09	0.01	0.01	0.166
Phe	0.43a	0.28b	0.28b	0.30b	0.32	0.07	0.03	0.007
Thr	0.72	0.58	0.55	0.51	0.59	0.09	0.06	0.082
Trp	0.18a	0.11b	0.10b	0.11b	0.13	0.04	0.01	< 0.001
Val	0.74a	0.46b	0.42b	0.51b	0.53	0.14	0.04	< 0.001
Total, indispensable amino acids	5.31	4.43	3.32	3.48	4.13	0.92	0.56	0.069
Dispensable AA
Ala	1.00	0.85	0.54	0.58	0.74	0.22	0.18	0.251
Asp	1.10a	0.83ab	0.66b	0.77b	0.84	0.19	0.08	0.007
Cys	0.23a	0.16b	0.18ab	0.19ab	0.19	0.03	0.02	0.033
Glu	1.31a	0.98ab	0.82b	0.91ab	1.01	0.21	0.11	0.026
Gly	3.05	2.74	0.97	1.68	2.11	0.96	0.59	0.081
Pro	12.35	12.95	2.58	6.01	8.47	5.03	3.59	0.161
Ser	0.69a	0.59ab	0.42b	0.46ab	0.54	0.12	0.06	0.032
Tyr	0.39a	0.26b	0.25b	0.26b	0.29	0.07	0.02	0.002
Total dispensable amino acids	20.11	19.37	6.42	10.86	14.19	6.67	4.52	0.127
Total, all amino acids	25.80	24.13	10.39	14.62	18.74	7.43	5.02	0.123

¹A = University of Illinois; B = Purdue University; C = University of Minnesota; and D = University of Kentucky.

^a,bMeans within a row lacking a common superscript letter are different (P < 0.05).