Evaluation of supplemental vitamin E on 56-day feedlot growth performance and plasma tocopherol concentrations in calf-fed Holstein steers

Figures & data

Table 1. Composition of basal diet fed to steers.

Item	Basal diet % DM
Steam-flaked corn	67.31
DDGS	10.00
Sudangrass hay	12.00
Molasses cane	4.00
Yellow grease	3.00
Urea	1.26
Dicalcium phosphate	0.33
Limestone	1.63
Magnesium oxide	0.15
Trace mineral salt^a	0.30
Rumensin 90, g/ton	150
Nutrient Composition^b
NE, Mcal/kg
Maintenance	2.21
Gain	1.54
Crude protein, %	14.0
Calcium, %	0.79
Phosphorus, %	0.34
Potassium, %	0.75
Magnesium, %	0.29
Sulphur, %	0.16
Vitamin E, IUkg	21.4

Note: DDGS, distillers dried grains plus solubles; NE, net energy.

^aTrace mineral salt contained: CoSO₄, .068%; CuSO₄ , 1.04%; FeSO₄ , 3.57%; ZnO, 1.24%; MnSO₄ , 1.07%; KI, .052%; and NaCl, 92.96%.

^bBased on tabular values for individual feed ingredients (NRC 2000).

Table 2. Influence of live weight and vitamin E supplementation on growth performance and plasma tocopherol.

							P values
	Weight group		Vit E, UI / hd / d				Weight	Vitamin E
Item	Light	Heavy	0	250	500	SEM	group	Linear	Quadratic
No. of pens	12	6	6	6	6
Live BW, Kg1
Day 1	141.3	454.2	299.2	295.6	298.5	7.0	<.01	.95	.71
Day 56	210.7	546.4	381.9	376.6	377.2	6.6	<.01	.62	.72
ADG, Kg/d	1.24	1.64	1.48	1.45	1.40	0.05	<.01	.31	.93
DMI, Kg/d	4.59	10.05	7.37	7.37	7.21	0.16	<.01	.48	.68
ADG/DMI	0.271	0.164	0.219	0.217	0.217	0.01	<.01	.89	.92
Plasma tocopherol, μG/mL
Day 1	1.62	1.47	1.60	1.50	1.54	0.12	.30	.72	.65
Day 56	2.13	2.35	1.21	2.40	3.11	0.20	.40	<.01	.36

NRC. 2000. Nutrient requirements of beef cattle. Updated 7th rev. ed. Washington, DC: National Academies Press.

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