Final answer:
The left paralumbar fossa is the exact anatomic site to ping on a left displaced abomasum (LDA) in bovine patients.
Step-by-step explanation:
The exact anatomic site to ping on a left displaced abomasum (LDA) is the left paralumbar fossa. Physical examination techniques such as percussion and auscultation are commonly used to identify an LDA, during which a "pinging" sound can be detected in this region. The left paralumbar fossa is located on the left side of the cow, just behind the rib cage and is the typical site for such physical diagnostic methods in bovine patients.