I have a 9 year old and a 27 year old I feed the 27yrold nutrena sr and he does great for the dry coat I use corn oil and hoof flex for the dry hoofs as well as let the tanks over flow for extra moisture when it is dry.
Im can't rember the percentages now, its early, but my 16 yo gets the Kent Dynasty. She is a hard keeper and doesnt do well on anything else. Its good feed and a little cheaper than TC. I also feed Omegatin, just for good measure.