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“They had metabolic bone disease from poor nutrition, low blood calcium, parasites, ringworm, giardia, and coccidiosis. They were just barely alive, and we were really concerned that they wouldn’t make it.”

Hansen said the industry can still do more to prevent the use of antibiotics to treat coccidiosis, a parasitic disease found in chicken intestines.

If blight kills all of your tomatoes, or coccidiosis takes all your chickens, you still have a bounty of squash surrounded by turkey pens.

While it is used in turkeys, chickens and pigs, farmers give it primarily to chickens to help control the parasitic disease coccidiosis, to promote weight gain and for "improved pigmentation," the FDA said.

All of them may cause disastrous epidemics of coccidiosis.