But without an education you are more likely to be at a loss when something unusual happens.
I'm reading "Spillover" by David Quammen at the moment which is a wonderful account of zoonosis, and the widely educated vets & other specialists, who have managed to advance this essential science, and thereby save countless animal and human lives. The vets (they seem to be mostly vets) are amazing not only for their skill & bravery but for their wide ranging intellects, many have taken a second degree or two in subjects like epidemiology or tropical medicine. No way would a narrowly trained vet have any chance of advancing such a field. I suggest you read this book, it should make you feel that your agriculture degree has not been a waste of time. Maybe your agricultural knowledge could help you and other vets when you encounter unusual cases. For example, it was found that palm oil sap, infected by bats, was the source of one virus that killed many humans. Detailed knowledge of agriculture, anthropology, zoology and virology was needed to put all these pieces together!

