As Heifer Ghana got its start in 1999, staff swiftly tackled the challenge of affordably domesticating grasscutters, a wild rodent prized in West Africa for its sweet and lean meat. Since then, Heifer developed an accessible and hugely successful method to raise the rodents to improve nutrition and income among its project participants. Today, demand in West Africa and beyond drives exponential growth in the production and sale of the animals.ANANG CHARLES, Ghana—She was clearly nervous. Strange people were milling about in front of her house asking questions about her. When she saw the camera, she froze. Her mouth full,...