Does the animal need to be restrained to take a retinal image?
Yes, a typical squeeze chute or calf cradle is all that is needed. Since retinal images are typically collected at the same time that livestock are being handled for other reasons, there is no need to catch the animals just to take retinal images. On the ranch this would include when calves are collected for branding, preconditioning or weaning. In the feedlot retinal imaging can be accomplished at receiving, re-implanting or during veterinary treatment.
