i thought what a good post mostly common sense then hey presto it starts slamming the antibiotics down the birds throats when clearly not nessasary it simply contradicts itself , i agree with keeping canker and cocci at bay but 3 to 5 days every month a bit excessive , test regular with a vet or buy a microscope , why treat for ailments the bird is naturaly keeping down ? if your loft is getting respirity problems no good treating all the time as this ailment will re occur you need to improve the enviroment by improve the ventilation , maybe reduce number of birds