Iodine deficiency is a geographical problem and occurs when:
- Feeds and water are low in iodine
- Lime & manure have been spread; which can reduce iodine levels in pasture
- Goitrogenic substances are present in feed, eg. kale
- Chemicals block thyroid uptake of iodine
Signs of Iodine Deficiency
- Hairlessness in new-born calves
- Decreased milk yields
- Reduced hormone secretion and reproductive health
- Reduced bone growth and skeletal development
- Poor growth and weight loss