Explanation. We have a horse on stall rest following colic surgery. This has taken over the blog. Mostly. [Begin, Phase III]
Week 8 post surgery
Week 2 of paddock rest
Horse is injured. Feed more! He needs strength! He needs to gain back the weight he lost!
Horse is confined. Feed less! Extra calories will bubble out his ears! Limit the stall frolics!
Onwards!
Katherine
Virtual Brush Box 
Hmmm.
Is a puzzlement!
Alternate days?
Much like people, the effect is cumulative & you never know if it was the food or something else. (Looks for puzzled emoji.)