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Abstract
Two experiments were conducted to determine the effects of pre-weaning vitamin E,
Se, and Cu supplementation on performance and immune response in stressed calves.
In Exp. 1, 71 Hereford x Angus calves were individually creep fed: 1) control supplement
(CON), 2) control plus 500 IU vitamin E+0.3 mg Se/kg DM (E), 3) control plus 10 mg Cu/kg DM (CU), or 4) a combination of E and CU treatments (ECU). In Exp. 2, 80
Hereford (Angus calves were individually creep fed: 1) control supplement (CON), 2)
control plus 0.3 mg Se/kg DM (SE), 3) control plus 500 IU vitamin E+0.3 mg Se/kg DM (LOWE), 4) control plus 1000 IU vitamin E+0.3 mg Se/kg DM (MEDE), or 5) control plus 1500 IU vitamin E+0.3 mg Se/kg DM (HIE). Treatments continued for 49 (Exp. 1) or 53 d (Exp. 2) prior to
weaning. At weaning all calves were transported to feedlot facilities. In Exp. 1,
vitamin E tended (P<0.09) to improve post-weaning ADG and reduce (P<0.06) plasma haptoglobin
(Hp), but had no effect on plasma α-tocopherol. Dietary Cu tended to increase (P<0.01)
liver Cu stores, and antibody titers to bovine viral diarrhea (BVD) were greater (P<0.04)
at weaning in CU and E calves. In Exp. 2, vitamin E tended to increase serum α-tocopherol
(P<0.06) and cortisol (P<0.08). Vitamin E and Se supplementation may improve post-weaning
performance and decrease plasma Hp concentrations in stressed calves.
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© 2000 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.