I can't quote from my phone. I don't know why it won't let me.
Anyway, why should I cull them? Is what they have incurable?
Chickens dont get colds. They get a specific disease. Respiratory diseases are easily spread to other birds, are transmitted on clothing, shoes, your hands, vehicle tires etc...
Antibiotics such as tylan, gallimycin, duramycin and all antibiotics simply mask symptoms and dont cure the disease. Antibiotics have no effect on viral diseases. Once an infected bird is treated with an antibiotic, there will come a time when the bird will be stressed for some reason and the symptoms will reappear requiring a more powerful antibiotic to treat the symptoms. The bacteria will have built resistance to the previously used antibiotic.You've heard about antibiotic resistance on the news, same applies with chickens. Sick chickens dont lay eggs, then if they did, eggs need to be discarded due to withdrawal periods.
Here's a link of common poultry respiratory diseases in chickens for you to read. Most of them make birds carriers for life as I previously mentioned. Havnt you read about the recent outbreak and spread of Avian Influenza in the news, where hundreds of thousands of chickens had to be slaughtered to prevent the spread of the disease? Biosecurity.
http://edis.ifas.ufl.edu/ps044
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