I've been trying to figure out why my mare has been kinda goofy the last week or two. She is on 2 1/2 lb. Purina Healthy Edge. 2 1/2 lb. alfalfa pellets, coastal hay and pasture every day-23/7. I have recently added MaxEGlo rice bran pellets-maybe 2 cups a day--not even according to the label amount to feed. She looks good and is in healthy weight- 7 yo, about 960 lb. at 14.2h. Riding 5-6 days a week. I have just read that the rice bran pellets have an NSC of 22%. That's higher than I'd like. Could that be the culprit? Besides the MARE part? I feed Purina because it's the only brand readily available in my town and I'm not interested in changing-just fyi. Thoughts?