Thanks so far with the responses. I knew the antibiotic resistance would come up. I have only been a veterinarian for 10 years (exclusively large animal), but in those ten years, I will tell you that I have not seen antibiotic resistence to the common bacteria. I can list plenty of times that I have seen it. I will tell you that the only time I have seen antibiotic resistance in a clinical case was a severe infection that I had personally been treating for an extended period of time and watched the sensitivity change to different antibiotics as I was treating.
In regards to food animals who had been taking low dose (this is the key) antibiotics for their entire life, I have never had one present clinically that was truly resistant. Most of the time we had them on the wrong antibiotic to begin with (based on culture and sensitivity). The other reason we see antibiotic resistance is not because of the fact that they were on the antibiotic, but the fact that they were not on therapeutic doses. Story goes, oh I just put a sprinkle of antibiotic in their feed or a teaspoon in their water. What we really should be doing is a therapeutic dose for a specified period of time. In case of the chicks, the most likely time they are going to have respiratory (bacterial) disease is right after shipping (cold trucks, airplanes, front porches...) so maybe we treat for 10-14 days after arrival. Same applies to enteritis. We see a fair amount of bacterial enteritis in neonates as they transition to new feeds.
This being said, I as well do not believe we need to feed antibiotics for the entire life of a food animal. However, what I was asking I guess (vaguely), what is the incidence of enteritis, respiratory disease... in chicks who have not been given antibiotics. These hatchery chicks are being born in commercial operations, which more than likely do not shut down often to disinfect and clean and therefore could have higher incidence of bacterial infections.
Ridgerunner, that is exactly what I wanted to see, survival with and without antibiotics, where did you get your chicks, commercial or private?
I am by no means a poultry vet, that is why I am on here, to learn what people are doing and every once in a while throw out some science based answers. By the way, 15 years of college and 4 degrees for those that care.
Sorry for the dictation, for a simple question...And Thanks for all of the responses. I am really starting to like this forum stuff.
Thanks for all of the responses! Ryan