Looking for some input on a bull that was sold as a yearling. He passed a semen test, was sold in form of exchange for work. He was delivered, ran pasture, and had no complaints from buyer. Bull as a 2 year old now was semen tested and failed based on low motility. Buyer is irate and wants a refund. How do I know he wasn’t affected by the cold or was injured. He passed and was good and now after he used him has failed. What are your thoughts? If I knew he wouldn’t pass after one year of breeding I would not have sold him but how long do you warranty a bull?? He still has salvage value to the buyer.