TABLE 2.

Comparisons of ruminal metabolites that significantly changed with yak fed diets containing different protein level ratios.

		Groups				SEM	q-values
Super class	Metabolite names	L	ML	MH	H		Treatment	Linear	Quadratic	Cubic
Organic acids and derivatives	Hydroxyurea	76,048	148,881	57,813	40,464	11,734.03	< 0.01	<0.001	0.12	0.05
	4-Aminobutyric acid	10,223	29,808	35,768	29,364	3,619.94	0.06	0.36	0.32	0.02
	Isocitric acid	99,404	23,365	23,365	23,365	7,452.25	< 0.001	0.01	< 0.0001	<0.0001
	3-Hydroxynorvaline	528,034	842,436	304,983	189,491	71,817.96	< 0.01	<0.01	0.36	0.01
	Galactonic acid	45,468	63,014	62,004	94,426	6,215.79	0.03	0.12	0.03	0.11
	L-DOPA	10,989	17,795	14,423	19,832	1,157.32	0.02	0.76	0.01	0.18
	2-Ketobutyric acid	105,552	144,046	103,195	98,246	5,463.85	< 0.01	<0.01	0.06	0.18
	4-Acetamidobutyric acid	152,770	194,089	161,726	178,094	5,554.59	0.03	0.20	0.01	0.80
	Citrulline	789,666	1,001,945	797,397	921,408	29,234.05	0.01	0.26	< 0.01	0.79
	3-Hydroxybutyric acid	232,771	315,818	148,691	120,568	24,299.88	0.01	0.01	0.49	0.02
	Glutaric Acid	342,226	476,562	275,466	217,889	32,762.22	0.02	0.01	0.50	0.08
	N,N-dimethylarginine	103,615	175,289	79,589	42,687	17,504.52	0.04	0.01	0.58	0.15
Lipids and lipid-like molecules	Citramalic acid	360,988	507,541	396,597	416,183	18,124.73	0.02	0.03	0.01	0.91
	Thymol	7,920	12,635	18,864	25,635	1,930.52	< 0.01	0.04	0.06	< 0.01
	Capric Acid	146,089	205,068	160,188	154,110	8,461.62	0.05	0.02	0.10	0.90
	Phytanic acid	8,312	21,306	6,921	24,654	2,802.57	0.04	0.61	0.01	0.97
	Arachidic acid	33,435	50,071	33,405	47,824	2,678.01	0.02	0.75	< 0.01	0.91
	4-Hydroxybutyrate	40,263	49,500	24,087	23,951	3,354.78	< 0.01	0.02	0.40	0.01
Organic oxygen compounds	Fucose	288,892	478,845	394,367	363,236	32,282.30	0.22	0.12	0.22	0.48
	Digalacturonic acid	25,798	48,880	36,775	51,166	2,921.60	< 0.01	0.83	< 0.001	0.08
	Tagatose	90,442	166,477	34,926	89,045	16,462.08	0.03	0.18	0.03	0.07
Phenylpropanoids and polyketides	3-Phenyllactic acid	298,914	341,291	304,344	83,639	30,041.52	< 0.01	0.001	0.07	0.25
	Caffeic acid	10,684	22,064	15,670	19,975	1,314.10	< 0.01	0.23	0.001	0.17
	Piceatannol	10,627,937	18,443,030	20,191,325	22,370,834	1425,419	0.01	0.90	0.01	0.02
	Hesperitin	74,725	185,831	201,860	248,675	24,526.29	0.07	0.76	0.09	0.04
	Hydrocinnamic acid	32,692,862	44,812,659	33,903,201	21,915,790	2,634,050.14	0.01	0.002	0.99	0.33
	Dihydrocoumarin	64,748	96,673	43,308	23,238	9,010.95	0.02	0.01	0.70	0.05
	3-(4-Hydroxyphenyl)propionic acid	43,016	70,843	53,067	30,230	4,297.77	< 0.01	<0.001	0.70	0.72
Benzenoids	Pyrogallol	870,419	1,157,283	931,917	1,035,939	33,836.73	< 0.01	0.09	< 0.01	0.80
	Noradrenaline	8,118	21,453	5,912	33,176	3,096.49	0.001	0.08	< 0.001	0.80
	Benzoic acid	494,985	752,846	480,557	307,760	47,527.04	< 0.01	0.0006	0.57	0.15
	4-Hydroxybenzoic acid	12,679	14,534	9,046	7,843	810.81	< 0.01	0.01	0.80	0.01
Organoheterocyclic compounds	Maleimide	170,704	226,584	176,306	182,508	8,172.15	0.05	0.05	0.04	0.68
	Urocanic acid	2,894	5,999	1,941	5,078	457.24	< 0.001	0.54	< 0.001	0.21
Others	Biuret	57,008	40,288	9,128	5,786	6,325.01	< 0.01	0.21	0.31	0.001
	D-Erythronolactone	93,281	116,333	83,983	97,711	3,854.94	0.01	0.12	0.01	0.12
	Mannose	56,689	81,005	37,577	72,988	5,156.19	0.01	0.89	< 0.01	0.09
	Atrazine-2-hydroxy	284,295	389,787	269,739	237,126	20,427.48	0.04	0.01	0.32	0.23
	9-Fluorenone	410,981	538,037	407,150	481,150	20,307.76	0.06	0.32	0.01	0.68
	Norleucine	12,278	20,023	13,683	11,469	1,195.13	0.04	< 0.01	0.20	0.65
	1,4-Cyclohexanedione	163,682	142,916	228,063	88,456	14,010.91	< 0.001	< 0.001	0.81	0.04
	Allylmalonic acid	14,826	20,897	16,422	4,032	2,077.46	0.02	< 0.01	0.38	0.45
	L-Threose	361,272	641,951	339,415	203,554	55,313.76	0.03	< 0.01	0.4541	0.25
	N,N-Dimethyl-p-phenylenediamine	12,025	25,724	11,245	6,745	2,302.25	0.01	< 0.01	0.24	0.22