Abstract
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 × 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.
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