Jaagsiekte sheep retrovirus Jaagsiekte sheep retrovirus Jaagsiekte sheep retrovirus (JSRV) is a betaretrovirus which is the causative agent of a contagious lung cancer in sheep, called ovine pulmonary adenocarcinoma. JSRV is the virus that is the cause of the contagious lung tumors in sheep called ovine pulmonary adenocarcinoma (OPA). The disease has also been called "jaagsiekte", after the Afrikaans words for "chase" ("jaag") and "sickness" ("siekte"), to describe the respiratory distress observed in an animal out of breath from being chased, indicating the breathing difficulty experienced by infected sheep. Transmission of virus is through aerosol spread between sheep. The exogenous infectious form of
Animal nutritionist animal production. A Master’s degree in nutrition is often seen in animal nutrition and the field often requires a Ph.D. in the science of nutrition. Those with an educational background can expect to be employed in the following areas: Animal nutritionist An animal nutritionist is a person who specializes in animal nutrition, which is especially concerned with the dietary needs of animals in captivity: livestock, pets, and animals in wildlife rehabilitation facilities. The science of animal nutrition encompasses principles of chemistry (especially biochemistry), physics, mathematics, ethology (animal behavior). An animal nutrition in the food industry may also be concerned with