Cows in a confined feeding operations in Yuma, Ariz.
Cows in a confined feeding operations in Yuma, Ariz. - 

Veterinary health is a big business -- bigger today, after Pfizer spun off its animal health care division into a new public company, named Zoetis.

Zoetis raised $2.2 billion, the biggest initial public offering since Facebook's debut in May.

Zoetis shares jumped during their first trading day on the New York Stock Exchange. Health care is one of the fastest growing sectors of the global economy. Within health care, the animal health business is an even better performer. And, Zoetis is the biggest player in that market by revenue.

“If you were to look at the worldwide market, you are looking in the neighborhood of $20 billion in annual sales,” Damien Conover, director of pharmaceutical research at Morningstar, told Marketplace earlier this year. Conover projects the animal drug business to grow at a “moderate” pace -- 5 percent -- over the next five years.

For that story, health care correspondent Dan Gorenstein visited Ft. Washington Veterinary Hospital in suburban Philadelphia, a clinic co-owned by Jeffery Berman.

“I mean, I’ve had people do second mortgages on their homes for animals. I know some who have spent upwards of $60,000 on their pets,” Berman said.

Marketplace New York reporter Mark Garrison reported on animal health care last year, and found that high vet bills aren't the only reason for the interest in animal health companies, like Zoetis. Analysts told Garrison that the more important market for drug companies is livestock

"As third-world countries begin to eat more protein, have better economies, that's where the real growth has been," said Jon LeCroy, who tracks pharmaceutical stocks for MKM Partners.

With more farmers feeding a growing hunger for beef, chicken and pork, drug companies are providing new vaccines and treatments. Texas A&M veterinarian Dr. Tom Hairgrove works with ranchers. He says drugs are more expensive now, but worth it because they keep the animals healthy and growing.

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Follow Ethan Lindsey at @ethanlindseyMMR