Table 8.

Effects of adding polyethylene glycol (PEG) to a steer ration containing high sorghum tannins on plasma parameters.

Items	PEG, g/kg DM				SEM	P-value
	0.00	1.75	3.50	7.00		T	L	Q
Nutrients
TP, g/L	68.73b	70.29a	70.26a	70.86a	0.539	0.043	0.069	0.530
ALB, g/L	27.58	27.53	27.73	28.04	0.311	0.659	0.514	0.745
Globulin, g/L	41.15b	42.76a	42.52a	42.82a	0.243	0.050	0.029	0.169
Urea, μmol/L	3.96	3.89	3.99	3.79	0.083	0.351	0.487	0.632
TAA, μmol/L	4.28	4.19	3.96	4.29	0.197	0.620	0.917	0.606
Hormones
GH, ng/mL	5.21	5.97	6.80	6.82	0.595	0.207	0.148	0.664
IGF-1, ng/mL	193.10	199.45	188.85	183.95	6.182	0.281	0.436	0.606
Purine derivatives
Uric acid, mg/L	12.76	14.03	11.79	14.79	1.335	0.418	0.762	0.760
Allantoin, mmol/L	1.05	0.87	0.87	0.98	0.061	0.096	0.549	0.079
Other metabolites
Creatinine, μmol/L	137.44	143.36	139.34	140.95	2.836	0.519	0.720	0.593
Hippuric acid, μmol/L	37.61	35.38	36.54	37.06	1.578	0.763	0.947	0.403

SEM = standard error of the mean; TP = total protein; ALB = albumin; TAA = total amino acids; GH = growth hormone; IGF-1 = insulin-like growth factor-1; T = treatment; L = linear; Q = quadratic.

^{a, b, c} Within a row, means without a common superscript differ significantly (P < 0.05).