Ivermectin for a 500 lb horse, day 1
Ivermectin for a 750 lb horse, day 8
Quest Plus for the proper weight, day 30
I did all that to clear out any worms. If he's still looking wormy after that, then about day 45 I'd start a Power Pac with the vet's permission.
Free choice grass hay 24/7 (I swear, she didn't even look UP for 3 weeks)
Strategy for a 500 lb horse (1/2% of body weight, so...2.5 lbs for 7 days)
Ultium 1/2 lb for 7 days
Amplify 1/2 lb for 7 days
1 oz fine white stock salt
I fed 2X/day, so 1.25 lbs Strategy, 1/4 lb Ultium, 1/4 lb Amplify each feeding.
Week 2, double the amounts of everything
Week 3, start feeding the Strategy for where you want him to end up (if you want him at 1200 lbs, so 1/2% body weight, 6 lbs, 3lbs/feeding or 2lbs/3X/day), double the Ultium & Amplify.
Week 4, maintain the Strategy or even increase it to just above where you want him to end up (say 1500 lbs, so 7 lbs or 3.5/feeding or 2.5 lbs 3X/day) and double the Ultium & Amplify again. (By now, you should be at 2 lbs Ultium & 2 lbs Amplify or you can use 4 lbs Ultium if you don't want to get the Amplify for some reason).
He should be obviously picking up weight by now and looking good and starting to shine.
Gigi Healthy before I sold her:
The picture that clued me in to the idiot starving her:
She sent me this pic to show me how WELL Gigi was doing.........
Gigi a month after I went and got her:
She looked so bad when I got her that I refused to take pics. I didn't want to be reminded.
Gigi after 2 months:
You can see the shine is starting to come up in her coat:
Gigi after 3 months:
I kept her blanketed/sheeted until the 3rd month when I couldn't see anymore hip/rib/spine/withers so prominent. I kept her separate and fed her separate for 2 months. Once she went back out into the herd, I brought her in to feed her the concentrates but let her graze with everyone else. After the 4th month, she was pretty much back to her usually sassy, bossy self and I let her go out to pasture with everyone else, once she was back to eating a normal bucket and could finish in the same amount of time as the other horses.