Giving birds all that treatment without the need for it will in the short term produce good winning pigeons , but ask yourselfs at what price ? as these will need proping up later on with more drugs and cost far more bescause there natural immunity will be weakened and compromised , for most a trip to a good avian vet will put there birds on the right track , the above guide is usefull and should only be used as that a guide . If you screen your birds regulary via droppings and a microbaterial swab once a month you start seeing patterns of infection out breaks , hygeine in the loft should be adequate to prevent most disease out breaks , regular changing of water twice aday is a must as most bacterial infections are spread via the water.