The term 'ovine exchanges' is a crossword solution for the job description 'BAAS' (4 letters). BAAS stands for 'Bureau of Animal and Plant Health Inspection Services', which is a branch of the United States Department of Agriculture. This branch is responsible for protecting animal and plant health, as well as promoting trade in animals and animal products. Ovine exchanges are a type of trade that involves the exchange of sheep and other livestock between countries.