This is a bone disorder caused by excess parathyroid hormone (PTH) usually as a result of poor nutrition. This 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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Mohammad Agha
Senior Sales Consultant | Arab Markets
Mohammad Agha serves as the Senior Sales Consultant for Connolly’s RED MILLS Group, representing a prestigious portfolio of products including Connolly’s RED MILLS horse feeds, Foran Equine Supplements, and Carr & Day & Martin Equine care products
Sanjay Reddy
Regional Manager MENATI (Middle East, Turkey, India)
Sanjay Reddy, Regional Sales Manager MENATI (Middle East, Turkey, India) Sanjay has worked with Connolly's RED MILLS since 2012 and is the senior regional manager for the Middle East. Turkey and India. Get in touch for advice about our range of horse feeds and supplements.




