Acclimate to grass, recovering from ulcers and salmonellosis

I have several other posts with lots of details about my horse. And I did search and saw some suggestions for acclimating to grass after being on a dry lot or stall rest. But since our case is specific thought I would ask opinions anyway.
Nutshell: for various reasons, Danny has been not eating grass consistently for the past 2 1/2 months, after being discharged from a two week stay almost dying from salmonella. He finally tested negative and can come out of isolation! However, he is still being Treated for ulcers and a very damaged GI system (3 More days misoprostol, two more weeks sucralfate, and currently half a tube of ulcer guard, but I plan to taper that). I’m adding GutX this week.

He is also on daily Equioxx for G.I. pain and suspected abdominal adhesions secondary to salmonella. We plan to finally do his spring vaccines in a couple of weeks, and then try a round of steroids to kick the pain out - fingers crossed.

Meanwhile, the above mentioned pain had prevented him from being able to graze down and eat grass. At the first barn where I had him isolated he initially was getting some grass. He seemed to have some gas colics possibly within 24 hours of any time he would eat grass. But as he’s been on the Equioxx a couple weeks, and is feeling better I’m letting him grab some mouthfuls here and there. Like seriously less than a minute a few times a day.
The previous pasture was wildly overgrown and not maintained and had not had horses on it for several years, so who knows what he might have ingested and his system was definitely pretty fragile at that time. Or it may not be related at all and may have just been other things who knows.

TLDR: after a horse has been not eating grass for upwards of two months, and still has a very fragile G.I. system, what is your best suggestion for ramping up grass grazing? I do have a muzzle and can turn him out with that on as well.

I’ve been turning mine out - muzzled - for just 15-30 minutes/day due to IR and Cushings. The other night I got busy and distracted they were out an hour and one had a bad gas colic the next day. Bad meaning laying down, kicking at their stomach. Within a few minutes there was a long gas release and then two big manures.

I’m curious to get collective COTH thoughts too. How slowly do we need to re-introduce pasture when muzzling to be safe?

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I understand Salmonella like e coli is bacterial, caught from contaminated fecal material or spoiled bagged feed or hay.

Both can linger as chronic digestive problems for some time before reaching an accute stage. Ive known several horses to die, and none to recover, from a cute attacks so you are very very lucky.

In general IME horses adapt very well to grass as long as they are not IR on a lush field. When handgrazing they can’t really take enough in in one hour to make any difference to their weight.

I’ve seen more horses get temporary diarrhea when they come off the field in fall and back on hay, as opposed to get diarrhea on the grass field.

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Short answer: a long time. I had one in the hospital for 3 weeks, lots of colic and resultant surgery complications. We just hand grazed him for a few minutes to start, then slowly moved him up to 10 minutes, with careful monitoring of his reaction when he’d go back in his stall. If there were any slight signs of discomfort, we’d back down to a few minutes again. And this was in the middle of summer, so it’s not like the grass was super lush or rich. We took months to work up to 15, 20. As he got stronger and felt better, we could accelerate the increase in amount of time on grass. So it’s just going to depend on how he handles it. I’d continue to move slowly and monitor carefully, and go with what he tells you. Try to remember that slow and steady wins the race, which can be hard when they enjoy the grass so much and they are so so pitifully skinny. But yes, it can take a long time.

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