Amino acid nutrition and metabolism in domestic cats and dogs

Table 2 Endogenous excretion of amino acids and nitrogen at the terminal ileum of adult cats, dogs, rats, and pigs

Amino acid	Adult dogs^a		Adult cats^b		Adult rats^a		Pigs^c
Amino acid	Protein-free diet	Enzyme-hydrolyzed casein	Protein free diet	Enzyme- hydrolyzed casein	Protein-free diet	Enzyme-hydrolyzed casein	15-kg BW	75-kg BW
μg/g of dry matter intake
Ala	515	951	666	1380	269	474	437	454
Arg	370	728	540	948	159	328	480	435
Asp + Asn	960	2428	1283	2725	660	1095	755	640
Cys	–	–	452	853	–	–	–	136
Glu + Gln	1089	5993	1427	4240	696	1513	786	735
Gly	600	1001	665	1298	513	435	1660	1053
His	268	700	397	897	136	218	231	166
Ile	362	1191	398	1205	249	575	231	265
Leu	560	1180	884	1823	378	706	399	459
Lys	441	866	570	1101	193	390	312	427
Met	119	323	164	411	75	157	–	65
Phe	465	624	632	1015	171	316	237	265
Pro	643	1814	820	1913	442	691	3557	3104
Ser	925	3386	1013	2734	407	887	549	345
Taurine	–	–	2091	299	–	–	–	–
Thr	1168	2015	1235	2127	450	659	571	423
Tyr	444	648	599	1046	180	361	181	213
Val	536	1448	696	1687	273	599	321	387
mg/g of dry matter intake
AA N	1.27	3.33	1.9	3.6	0.71	1.23	1.63	1.40
Total N	2.27	4.12	2.4	3.6	1.91	1.63	2.16	–

“–” data are not available
^aHendriks et al. [21]. Adult dogs and rats were fed either a protein-free diet or a diet containing 23% enzyme-hydrolyzed casein
^bHendriks et al. [22]. Adult cats were fed either a protein-free diet or a diet containing 14% enzyme-hydrolyzed casein
^cThe values were determined in 15-kg growing pigs [23] and 75-kg growing pigs [24] fed a protein-free diet

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