On my visits to the U.K., I am sometimes asked to visit farms where there is a challenge for which another set of eyes are required. I visit many units to help support the farmers improve their efficiency and optimize production. It is interesting to see the number of different issues I am asked to advise on including mastitis, lower milk production and cows not getting into calf. Cows regularly getting pregnant and having a calf is essential in running an efficient operation and so it is important that all cows are healthy. Reproduction work for a vet is an important part of our dairy work. When done routinely we can spot problems early, but also help the herd perform much more efficiently. But occasions can occur when, even though regular veterinary routines are done, issues can arise. As farmers you will be very aware that there are several factors that can help or hinder the reproductive efficiency of your herd. When a problem occurs then it is important that these factors are investigated.