The red pellets are the higher value spring grass nuts - higher energy content than oats!!!
I feed the ever so slightly quirky Tobes the blue bag grass nuts which are summer (lower energy value) ones.
Fellow livery commented when I took off his outside rug that he looked 'portly'!!! I strongly denied this comment, pointing out that actually as an appaloosa he has quarter horse stock in his blood accounting for his large back end!!! And we have NO grass!!
But in all seriousness, he holds his weight well on the grass nuts - and the added bonus is because they are just grass you can feed them and saddle them up and ride them as soon as they have finished eating. I don't feed anything else with them - alfalfa doesn't suit him, and he has all the fibre he needs with the nuts. Previously during winters he did lose quite a lot of weight on all the Allen & Page/Spillers etc. 'conditioning feeds'
Simple Systems I find are fab. We don't have a stockist near us, I just ring them, and the man in the van comes and delivers and leaves them in the garage for me, and they ring me the day before and tell me when they are arriving.
Can't fault them. Hope they suit yours.