First mother reared Gorilla in captivity was Jambo, born at Basel Zoo in Switzerland 1961. Several other zoos had mother-reared infants before Howletts started breeding and quite a few of Howletts early babies had to be handraised too.
The video says Columbus received two young gorillas whereas it was actually three. The first shots on the video are Christina & Christopher (not Colo's father Baron-he was already about five years older than Christina) Christopher was later sent to Basel where, as Stephi, he became the father of several young Gorillas, including Jambo above.
I read that Colo actually escaped the other day... a door was left open and she wandered out but didn't get out of the building into the zoo grounds, and she was enticed back quite quickly I think.