What is Nutritional Secondary Hyperparathyroidism?

Hyperparathyroidism in horsesThis is a bone disorder caused by excess parathyroid hormone (PTH) usually as a result of poor nutritionThis condition is also known as Big Head, Bran Disease or Miller’s Disease as it is common in horses fed high levels of bran. Bran is high in phosphorus, low in calcium and contains chemicals called phytates, which reduce calcium absorption. When bran is fed in high levels, without appropriate mineral supplementation, it can result in calcium deficiency. This in turn stimulates the production of PTH and causes fibrous growths to form in the bones, typically on the face, to compensate for mineral loss.  Thankfully, due to balanced commercial feeds, few cases of this condition are seen today. 


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In 1999 Louise qualified with a BSc (Hons) in Equine Science, during which she specialised in breeding science and went onto graduate with an MSc in E ...

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