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ABSTRACT
To determine the effects of growth implants and trace mineral (TM) supplementation
and source on immune response, 375 steers (approximately 7 mo of age and 250.0 ± 11.0
kg), stratified by initial body weight, were randomly assigned to 1 of 36 pens that
were then randomly assigned to treatments. Treatments consisted of 1) control (no
supplemental Cu, Zn, Mn, and Co), 2) inorganic TM (CuSO4, ZnSO4, MnSO4, and CoCO3), and 3) organic TM (iso-amounts of organic Cu, Zn, Mn, and Co). On d 28 post-arrival
to the feedlot, steers from 6 pens per treatment received a growth implant containing
200 mg progesterone and 20 mg estradiol benzoate, whereas the other half of the steers within the same treatment
(6 pens) did not receive a growth implant. Steers were fed a corn silage-based growing
diet for 56 d and were then gradually switched toa high-concentrate finishing diet.
At the beginning of the finishing phase, only steers receiving growth implants during
the growing phase were reimplanted with 80 mg of trenbolone acetate and 16 mg of estradiol. During the finishing phase, all minerals excluding Zn were fed at
NRC recommended concentrations in inorganic form. Treatments during the finishing
phase consisted of 1) control (no supplemental Zn), 2) inorganic Zn (30 mg Zn/kg DM from ZnSO4), and 3) organic Zn (iso-amounts of organic Zn). At the end of the growing phase,
steers receiving organic TM had greater (P < 0.02) total IgM concentrations than inorganic-supplemented
steers, and implanted steers tended (P < 0.07) to have greater IgG antibody titer
concentrations specific for pig red blood cells than nonimplanted steers. During the
finishing phase, steers supplemented with organic Zn had greater (P = 0.04) ovalbumin
antibody titer concentrations than steers supplemented with inorganic TM.Superoxide
dismutase activity, interferon gamma concentrations, and antibody titers specific
to pig red blood cells and infectious bovine rhinotracheitis virus were unaffectedby
TM treatment or growth implants.
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© 2007 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.