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Abstract
Three-hundred Angus cows were used in a randomized design to evaluate trace mineral
supplementation over a 209-d trial on cow and calf performance, liver trace mineral
content, and immune function. Treatments included the following supplemental trace
minerals: 1) inorganic trace minerals—low level; 2) inorganic trace minerals—high
level; and 3) organic trace minerals—high level. Cows fed the high level of inorganic
trace minerals lost more weight (P<0.05) than cows fed the other treatments. Cow condition
score was not affected by treatment. Calf average daily gain on the organic high level
of trace minerals was higher (P<0.05) from birth to May 13 and May 13 to September
24 compared with the other treatments. Pregnancy rate to artificial insemination was
higher (P<0.05) when cows were fed the organic high level of trace minerals compared
with the other treatments. Trace mineral supplementation had an equivocal impact on
liver trace minerals over time. Cell-mediated immune function was not affected by
type or level of trace mineral supplementation.
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© 2000 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.