The iodine status of grazing sheep as monitored by concentrations of iodine in milk

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Abstract
The I nutrition of grazing ewes was assessed from milk I concentrations. In 54 flocks sampled throughout Victoria [Australia], the mean milk I concentrations in ewes ranged from 79-1831 .mu.g/l. In 2 flocks where newborn lambs had goiter the concentrations in ewes ranged from 45-98 .mu.g/l. A marked seasonal variation was apparent when ewes in a flock were sampled at monthly intervals over 2 yr. Milk I concentrations were highest at the end of summer and were lowest in spring. In grazing ewes the milk I concentrations remained relatively constant throughout the day. In ewes given single oral doses of up to 2 mg I, milk I concentrations increased to maximum within 5 h, the increment being related to the dose administered, and decreased to pretreatment concentrations within 24 h. Milk I concentrations in ewes given 1 ml iodized oil i.m. remained significantly higher than untreated ewes in the same flock for 16 mo. after treatment. The effectiveness of the single injection was still apparent after 2 consecutive pregnancies in the ewes.

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