Ovine pulmonary adenocarcinoma be predisposed to OPA. Most affected sheep show signs at 2 to 4 years of age. OPA is not a notifiable disease, and therefore it is difficult to assess its prevalence. OPA was first described in the UK in 1888, and described in detail in South Africa in 1891. The disease was initially known as "jaagsiekte" , a word derived from Afrikaans, meaning "chasing sickness," so called because animals are in respiratory distress as if they are out of breath from being chased. It has also been known as sheep pulmonary adenomatosis and ovine pulmonary carcinoma. OPA has been used
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