Actually, you need to be really careful when feeding wheat bran. Horses need a Caratio of 2:1, and wheat bran is way off from that ratio. You can cause some serious issues by feeding wheat bran frequently than say, once a week or every other week. Check out "Big Head Disease" - I tried to link an article about it but it won't work...
Horses LOVE to eat hot bran mashes, but bran mashes actually offer little to no nutritional value to the horse.
Could you message me the link please. I have been feeding my horses wheat bran with a mix of lettuce, alfalfa/or oats mix and the vet said they were completely healthy. I had them all checked out about 2 months ago. Im glad you bring this up I dont wanna be giving ppl bad advice! Or putting my horses in danger of getting sick.