This was not at Oklahoma City Zoo but some roadside attraction called the Garold Wayne Interactive Zoological Park according to the article in the link.
Six month old giraffe Kyah will be undergoing risky surgery next week to hopefully save the calf's life. She has a heart vessle thats wrapped around her esophous meaning she cant really eat. It will be a high risk surgery, it's never been done on a giraffe, but it's her only chance. I hope Kyah can pull through.
Long odds for zoo giraffe | News OK