Table 1.
The contents of metabolites (mg/100 g) in the breast meat of different broiler strain (Cobb and Ross 308) reared from conventional (Con) and animal-welfare (Wel) farms

Item	Farm	Strain		SEM¹
Item	Farm	Cobb	Ross 308	SEM¹
Amino acid
Alanine	Con	27.52^b	37.25^a	1.478
	Wel	29.89	33.41	2.573
	SEM	1.941	2.244
Anserine	Con	321.29	358.78^y	14.733
Wel	347.93^b	408.15^a^x	12.622
SEM	16.512	10.185
Aspartic acid	Con	12.61^b	22.51^a	0.900
	Wel	10.84^b	20.89^a	1.201
	SEM	0.644	1.355
Creatine	Con	343.63^a	288.98^b^y	7.263
	Wel	343.42	315.97^x	9.499
	SEM	9.161	7.685
Glutamic acid	Con	25.39	29.92	1.942
	Wel	22.72	26.69	1.573
	SEM	1.888	1.638
Glycine	Con	37.97^b	46.52^a	2.832
	Wel	36.24	42.04	2.577
	SEM	2.119	3.189
Isoleucine	Con	5.33^b^x	7.32^a	0.484
	Wel	3.71^b^y	6.76^a	0.462
	SEM	0.391	0.544
Leucine	Con	4.92^b	7.50^a	0.423
	Wel	3.89^b	7.17^a	0.342
	SEM	0.360	0.407
Phenylalanine	Con	5.74^b^x	7.67^a	0.351
	Wel	4.64^b^y	7.06^a	0.362
	SEM	0.302	0.404
Tyrosine	Con	11.54^b	15.75^a	0.800
	Wel	10.86^b	15.49^a	0.674
	SEM	0.725	0.753
Valine	Con	7.71^bx	9.80^a	0.602
	Wel	5.39^b^y	9.11^a	0.630
	SEM	0.496	0.716
β-Alanine	Con	33.35	37.49	3.253
	Wel	30.33	39.20	4.018
	SEM	3.530	3.778
Nucleotide-related product
Hypoxanthine	Con	5.34^b^y	9.14^a	0.430
	Wel	7.78^x	8.61	0.615
	SEM	0.421	0.621
IMP	Con	160.88	161.51^y	5.309
	Wel	150.36^b	186.63^a^x	6.983
	SEM	6.454	5.941
Inosine	Con	35.96^b	52.01^a	2.845
	Wel	38.29^b	46.02^a	2.185
	SEM	2.684	2.380
NAD	Con	14.09	13.03	0.614
	Wel	13.41	13.34	0.896
	SEM	0.487	0.970
UMP	Con	3.49	3.13	0.155
	Wel	3.34	2.94	0.154
	SEM	0.183	0.119
Uracil	Con	0.53	0.71	0.074
	Wel	0.56	0.59	0.081
	SEM	0.063	0.090
Organic acid
Acetate	Con	2.88^y	3.12^y	0.079
	Wel	3.36^x	3.40^x	0.110
	SEM	0.098	0.094
Fumarate	Con	0.08	0.05	0.013
	Wel	0.06	0.06	0.013
	SEM	0.014	0.012
Lactate	Con	593.77	566.01	19.446
	Wel	549.79^b	617.10^a	18.220
	SEM	19.352	18.320
Methylmalonate	Con	5.50	5.83	0.221
	Wel	5.11^b	6.38^a	0.192
	SEM	0.196	0.217
Others
Ethanol	Con	0.81	1.52	0.215
	Wel	1.02	1.52	0.205
	SEM	0.119	0.272
Glucose	Con	11.38^b	16.84^a	0.957
	Wel	9.11^b	19.09^a	1.519
	SEM	0.899	1.553
Niacinamide	Con	5.29^b	7.25^a	0.437
	Wel	5.31^b	7.86^a	0.208
	SEM	0.430	0.222

Standard error of mean (n=20).
Different letters within the same row differ significantly (P<0.05).
Different letters within the same column differ significantly (P<0.05).