Amprolium causing resistance - this is a classic example of mis-information on a thread.
Amprolium is not an antibiotic in the sense like Penicillin is. It is an analog of Vitamin B1, and works by preventing the uptake of thiamine (B1) by the organism which causes coccidiosis.
Amprolium makes the creature's body an environment hostile to the development of coccidiosis, without actually attacking the coccidiosis organism.
It's like a placebo food for the coccidiosis microbe, which gets no nourishment from it.
To some degree amprolium also reduces the uptake of thiamine in the creature who is eating amprolium in its feed, so it is only administered until the young chickens are old enough to have built up an immunity to coccidiosis, from low-level environmental exposure to it.
Using amprolium does not contribute to drug-resistant microbes.
Amprolium is not an antibiotic in the sense like Penicillin is. It is an analog of Vitamin B1, and works by preventing the uptake of thiamine (B1) by the organism which causes coccidiosis.
Amprolium makes the creature's body an environment hostile to the development of coccidiosis, without actually attacking the coccidiosis organism.
It's like a placebo food for the coccidiosis microbe, which gets no nourishment from it.
To some degree amprolium also reduces the uptake of thiamine in the creature who is eating amprolium in its feed, so it is only administered until the young chickens are old enough to have built up an immunity to coccidiosis, from low-level environmental exposure to it.
Using amprolium does not contribute to drug-resistant microbes.