I've got a 500lb Bull that needs to be castrated. I've got a small bander but this guy is too big for it, and I really dont want to spend $80 on a different bander that I may only use once, so I'd like to cut him.
Another option would be to ask your friends/vet if they know someone who has a larger bander that would be willing to either loan it to you, or come over and help you band this guy. Two is always better than one, just in case something goes wrong.
My real question is; should I be conserned about flys in May?
You don't list where your from, so all I can say in response to this question is that if you've got flies buzzing around, it would probably be in your best interest to be concerned - especially if this guy is penned. I don't know about your area, but it's been a warm, wet spring here. The pens are mucky, and the flies are already buzzing around.
What should I treat him with to keep the flys from bothering the wound until it heals.
I can't help you with this one, because I don't know. Most of the water-based fly sprays don't work, and I'm not sure if the oil-based ones would clog up/close off the wound to air - thus prolonging healing - or attract and hold dirt/weed seed/etc, and encourage infection.
Also, should I give him a tetus toxoid at the same time?
I would - especially if he is penned. It is cheap insurance.
Thanks in advance for any and all advice.
Tim