Karen Walsh: My new bull isn't up to the job - how can I get my money back?

While complete infertility of bulls is rare, approximately 20% of bulls are subfertile and will get some animals pregnant, but it will take several attempts and, therefore, more time, writes rural solicitor Karen Walsh.

While complete infertility of bulls is rare, approximately 20% of bulls are subfertile and will get some animals pregnant, but it will take several attempts and, therefore, more time. 

Dear Karen, 

I bought a bull at a pedigree sale, but it hasn't got any of my cows in calf. Fertility testing that I got done has showed that there are some good swimmers - but not many, so the seller is disputing my claim that the bull is infertile.