New Zealand Journal of Agricultural Research abstracts
Effect of dietary zinc oxide on the plasma carotenoid concentration of
steers
T. W. KNIGHT
A. F. DEATH
T. K. WYETH
AgResearch Grasslands
Private Bag 11008
Palmerston North, New Zealand
Abstract The effect of supplementary zinc oxide (ZnO),
administered at different doses and frequencies, on plasma carotenoid (PC)
concentrations of beef cattle was determined in three experiments. In
Experiments 1 and 2, Angus and Angus crossbred steers were drenched twice
weekly with the equivalent of 12.5 and 25 g ZnO/100 kg liveweight per week
(Experiment 1), and 50 g ZnO/100 kg liveweight per week (Experiment 2) for 31
and 25 days respectively. In Experiment 3, Angus x Friesian steers received a
daily supplement of 1 kg pellets containing 10 g ZnO per head for 28 days.
There was no effect of drenching with ZnO on PC concentrations but by day 28,
the daily supplement of 10 g ZnO increased PC concentration by 22%. The results
indicate that ZnO supplements can not be used to reduce carotenoid absorption
in cattle.
Keywords plasma carotenoids; zinc oxide; cattle
New Zealand Journal of Agricultural Research, 1996, Vol. 39: 293-296
0028-8233/96/3902-0293 $2.50/0 (c) The Royal Society of New Zealand
1996
PDF file of entire paper: medium quality (296K); (scanned from paper original: notes about this process)
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