Hi pete
I m very lucky in the fact that I live 100yds from a pigeon specialist vet. He introduced me to baytril 2 / 3 years ago when i had a bad case of young bird within 4 days of starting treament. He also recomended that for 5 / 6 days after treatment give the birds gemthepax and vitamins.
I hope this has been helpful
All the best Noby