Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hello Michelle,
Thank you for writing and I can certainly understand your frustration after going through surgery.
Yes, fat cells also release estrogen and it's possible that this is a factor. Phytoestrogens are not high in grasses. Soybean meal is high in plant estrogens and carrots and apples also offer some.
But grain -- barley and oats, in particular, are high in phytoestrogens. Grain also can cause behavioral issues in many horses due to the high starch level, as well, which causes highs and lows in blood glucose.
So, my main suggestion is to stop feed cereal grains. Replace them with a low starch feed or beet pulp.
I would also consider giving her Mare Alleve. This herbal product has been shown to be helpful for many of my clients.
The last suggestion is best to do after you've tried changing her diet and given her Mare Alleve. But, addtional magnesium provided by Quiessence, may have a calming effect on her nervous system, since most horses do not get enough of this mineral.
Keep me posted!
All the best,
Dr. Getty 
Where are you from? Bayfield, CO