HOUSTON (AP) — Hot and tired from a three-hour drive inside a trailer behind a pickup truck, the 600-pound English Charolais calf was content to lay on the grass behind a south Houston building while a team of technicians worked on its hind legs. Hero became what may be the nation's only double-amputee calf with prosthetics on Wednesday when fitted for a new pair of high-tech devices attached to its back legs. Surgeons at Texas A&M accepted Martin's initial pleas for help, removing about two inches of bone to enable them to create a pad of tissue that would allow for prosthetics. [...] I worked on him, I hadn't ever done it before. Hero's hooves are custom made of urethane and titanium, the connecting components are titanium and carbon fiber and the sockets that attach to his legs are carbon fiber and acrylic resin.