More than a decade ago, Kirby Bros. stopped blending corn, oats, and bran and topping the concoction with molasses to satisfy the cravings of horses that had long been part of the South Jersey landscape. The 100-pound bag of horse feed, priced at $13.60, was the biggest seller, said Chuck Kirby, who inherited the 140-year-old family business and mill in Medford and operated it with his wife, Jan, and their son, Chaz.

As farms started to disappear, Chuck Kirby said, it made more sense to import livestock feed from Pennsylvania for their customers and to introduce a new line of food for pets, birds, and wildlife as suburbanites moved into the area.

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