Welcome to the forum and sorry to hear of the abscess.
How old is he?
How long has he been recovered?
How much weight did he lose?
Was his weight stable at 900g without the critical care?
I assume you’ve giving the critical care as a way to boost his weight.
Regaining lost weight takes a long time after they have recovered, and it is done through plenty of independent hay intake.
He sounds to have been ill for a long time but without knowing how long he had been feeling better and eating normally it’s hard to know whether you would be expecting to see weight gain; or indeed whether it is weight he will even be able to regain.
Sometimes they simply don’t go back to pre-illness weight and instead just maintain at a new lower level. That’s fine if that happens and you won’t actually need to do anything to make him gain weight (he will naturally maintain just with a good hay based diet).
Age will have a factor in it also - an older piggy is much less likely to go back to their previous
normal.
The other thing I need to pick up on is that they have had a blood drawing fight but you are still putting them together daily for playtime and are considering rebonding.
A blood drawing fight is immediately and permanently bond breaking and means those two piggies must never have physical contact again - no playtime (which isn’t something recognised by piggies anyway), no rebonding.
While putting them together for playtime sounds, to us, a nice way to keep them interacting, to them it really isn’t. To them each time you put them together you are putting them into full on bonding mode but due to the fight(s) it has no chance of success - fights only occur when they don’t like each other. It isn’t seen as a nice playtime as that is not how piggy hierarchies, relationships and society work.
A fight means they can’t have a functioning hierarchy and don’t actually want to be together, so it is stressful to be put into a futile bonding situation every day.
It’s best that they are kept in their separate cages at all times and have separate playtimes out of the cage.
Their interaction between the bars is absolutely enough to stop them from being lonely and is the normal course of action for a failed pair.
I’ve added our Fall outs and society guides below
1 The hormonal teenage months
- What are the most difficult times?
- What are your boars' chances of making it together?
- What can help to boost your boys' chances?
- What does NOT work?
2 Fighting, bullying and when to separate
- What are the signs of a dysfunctional bond?
- How can I test whether a bond is no longer working?
- What to do if your boars had a bloody fight?
3 Life after...
Introduction
1 A Look at Social Identity
- Identity and Self-awareness
- Herd and Group: Juggling social identities
2 Herd Behaviours
- On the move
- Shared herd feeding
3 The Group and I
- Group identity vs. individual identity
- Group establishment and affirmation
- Use of the denning...