Table 5.

Apparent amino acid disappearance from the small intestine over time for pigs fed a whey protein isolate containing test meal and parameters of the Logistic function for apparent amino acid disappearance^*

(Mean values with their standard errors)

	Post-feeding time, h												Parameters†
	1		2		3		4		6		12		α, %		β, h		γ, %/h		T α/2, h		T50, h
	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE	Mean	SE
	%
His	13·9	7·84	31·1	2·17	60·4	3·72	70·3	6·15	84·6	2·49	87·7	2·62	86·1	3·37	2·79	0·43	1·15	0·18	2·43	0·11	2·88	0·13
Ile	30·4	6·96	41·7	3·59	73·4	3·12	80·0	4·54	90·4	1·99	92·5	1·51	92·2	3·13	1·95	0·30	1·01	0·15	1·94	0·10	2·19	0·11
Leu	33·5	6·65	46·6	3·44	73·8	3·04	82·1	3·84	89·3	4·29	94·4	1·14	92·8	3·12	1·73	0·28	0·96	0·14	1·80	0·09	2·04	0·10
Lys	39·0	6·29	54·5	2·25	75·5	2·51	83·6	3·16	94·5	0·87	94·5	1·45	94·8	2·60	1·44	0·21	0·91	0·12	1·58	0·07	1·75	0·08
Met	48·9	5·80	56·8	4·33	78·6	3·21	83·1	4·18	91·8	1·65	93·6	1·39	93·0	3·20	1·03	0·25	0·85	0·16	1·21	0·08	1·45	0·09
Phe	24·9	6·70	38·2	2·90	69·4	3·06	74·6	5·94	83·5	5·13	89·4	2·17	86·3	3·41	2·18	0·38	1·08	0·19	2·01	0·11	2·66	0·13
Thr	24·2	6·55	36·6	2·07	65·8	3·07	71·3	5·96	84·8	1·65	87·1	1·50	86·4	3·11	2·10	0·31	0·99	0·14	2·12	0·10	2·63	0·13
Trp	44·4	5·00	53·5	2·14	73·2	2·81	81·5	3·40	90·9	1·42	93·5	1·27	93·2	2·73	1·14	0·20	0·79	0·11	1·44	0·07	1·68	0·09
Val	26·2	6·96	40·7	2·89	69·1	3·14	75·3	5·20	86·8	2·18	87·9	2·55	87·6	3·09	2·06	0·32	1·04	0·16	1·98	0·10	2·41	0·12
Ala	25·7	6·45	38·7	1·77	66·7	3·01	74·8	5·00	84·0	5·01	89·8	1·50	87·8	3·20	2·04	0·31	0·99	0·15	2·07	0·10	2·51	0·13
Arg	17·4	5·52	26·0	2·58	56·1	3·18	59·1	8·29	73·2	3·62	72·0	4·43	72·5	3·69	2·53	0·52	1·12	0·23	2·26	0·14	3·44	0·24
Asp	15·6	7·24	27·3	3·16	60·3	3·46	70·2	5·55	89·6	1·43	91·3	1·33	91·0	3·31	2·80	0·37	1·07	0·15	2·53	0·11	2·89	0·12
Glu	16·4	6·91	30·4	3·13	59·4	3·22	70·8	4·26	83·9	4·46	92·4	1·27	89·3	3·28	2·57	0·35	1·02	0·14	2·64	0·09	3·01	0·10
Gly‡	−57·2	10·6	−33·1	12·2	8·81	4·61	−6·13	28·6	28·5	8·35	45·8	14·5	–		–		–		–		–
Ser	12·5	7·67	26·9	2·72	57·5	3·97	58·1	7·99	79·7	4·06	84·0	2·09	81·8	4·13	2·79	0·53	1·10	0·22	2·52	0·14	3·20	0·18
Tyr	23·1	6·92	35·0	3·78	67·3	3·36	67·3	6·14	83·6	4·00	88·1	2·33	86·2	3·69	2·24	0·40	1·05	0·19	2·14	0·12	2·64	0·14
Total§	19·2	3·23	37·8	2·76	58·4	2·95	72·9	2·72	83·1	2·61	84·9	3·20	84·9	3·21	2·24	0·34	1·01	0·15	2·22	0·11	2·79	0·14
EAA§	26·6	3·11	46·6	2·45	65·8	2·66	78·2	2·33	87·0	2·36	88·7	2·91	88·7	2·92	1·80	0·27	0·95	0·14	1·89	0·09	2·30	0·11
NEAA§	8·77	3·32	23·2	3·89	45·8	3·85	64·4	3·86	76·5	3·41	77·9	4·00	77·9	4·00	3·28	0·64	1·21	0·25	2·71	0·14	3·54	0·19

^*Values are mean values with their standard error of the mean, n 6 growing pigs per post-feeding time.

^†T _α/2 is the point (time) at inflection. T₅₀, the time at which half of each amino acid was apparently absorbed. T _α/2 and T₅₀ were calculated based on fitting parameters (β and γ) of the Logistic function as detailed in Materials and Methods.

^‡The Logistic function did not converge for Gly.

^§Total, EAA and NEAA, total, essential and non-essential amino acids.