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Abstract
Extract
Madam:– For several years we have been concerned with developing safe and effective methods of administering zinc to farm animals for the control of facial eczema. In none of our trial work involving repeated daily, weekly and fortnightly dosing of zinc oxide to sheep not vaccinated against salmonellosis has salmonellosis been encountered. Recently two reports(Citation1),(Citation3) have suggested that high doses of zinc oxide have played a part in the aetiology of two outbreaks of salmonellosis in sheep and we thank the authors of both papers for pointing out their field observations. In the first outbreak(Citation3) the sheep were subjected to exceptional stress (thrce days of mustering, yarding, drafting, tagging, weighing, bleeding, dosing and trucking). Even so it appeared that the "zinc dosed" and not the "nonzinc" group were affected by salmonellosis, but in exceptional circumstances.