Ovine pulmonary adenocarcinoma Ovine pulmonary adenocarcinoma Ovine pulmonary adenocarcinoma (OPA), also known as ovine pulmonary adenomatosis, or jaagsiekte, is a chronic and contagious disease of the lungs of sheep and goats. OPA is caused by a retrovirus called jaagsiekte sheep retrovirus (JSRV). The disease has a long incubation period, and therefore signs usually occur in adult animals (over 2 years of age). Clinical signs resemble a non-specific progressive pneumonia, including poor body condition and, particularly after exercise, respiratory difficulty. Unless a concurrent lung infection is present, affected sheep continue to eat. The only sign specific to OPA is a watery nasal discharge, consisting
Title (animal) Title (animal) In animal husbandry and animal fancy, animals can compete in various shows and sports for titles signifying excellence. These titles vary depending on the species of the animal, the kind of show, and the country the event is held in. Dogs competing in conformation shows are eligible to win two titles. The first is best of breed, which signifies that a given animal is the best of its breed at the show. These best of breed winners then compete to win best in show. Animals that win enough best of breeds and best of shows are called "Champions",