Abnormal Findings
The following are a few examples of common lesions seen in cattle. This is not a complete list of lesions, therefor you should take samples of any tissue that does not appear normal.
For more pictures of abnormal findings you can
visit Cornell's Dr. John M. King's Necropsy Show and Tell at http://w3.vet.cornell.edu/nst/nst.asp
You will want to do a keyword search of "cattle".
Esophagus and Trachea
Forestomach
Heart
Intestine
Kidney
Liver
Lung
Muscles/Joints
Udder
Urinary Bladder
Uterus