Need to show what a zinc deficiency looks like in poultry? How about a biotin deficiency?
The Animal Science Image Gallery is home to several images of vitamin and mineral deficiencies in poultry, as well as other livestock species. These images may not be pretty, but they could be useful for classroom instruction.
Once at the Gallery, click on the "Poultry" tab to see the broad range of images available. Members can download and submit images for free. If you are not an ASAS member, it is $25 to download or submit images.