I've used 6 month old males a few times now and sent them for meat in about February when smell has worn off. Meat was very good.
If boy doesn't seem tall enough I stand female on slope facing down hill, male usually manages at that.
Young males don't seem to smell that bad, esp when allowed to run out, ie field shelter and open access.
Once borrowed a Billy, before I set off I commented he didn't seem to smell too bad, I was told I should get out more
, on the way home, in a van, I was nearly sick with the smell, open sheds are the way to go!