Sometimes you never know what went wrong.
Have you inspected all of them closely to make sure navels are healed and butts are not pasted. Every single one of them is eating/drinking?
I would try to go with a red light though if possible.
Reason I'm asking about navels healed, I looked back over your photos. That does not look like the vent, it looks like the navel and possibly intestine wrapped around the leg, but I would be wrong.
Have you inspected all of them closely to make sure navels are healed and butts are not pasted. Every single one of them is eating/drinking?
I would try to go with a red light though if possible.
Reason I'm asking about navels healed, I looked back over your photos. That does not look like the vent, it looks like the navel and possibly intestine wrapped around the leg, but I would be wrong.