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 worship Animal worship Animal worship (or zoolatry) refers to rituals involving animals, such as the glorification of animal deities or animal sacrifice. When a god is respected or worshipped by means of a representative animal, an animal cult is formed (Teeter et al., 2002, p. 355). Animal cults may be classified according to their outward form or according to their inward meaning, which may of course undergo transformations (Thomas 1911, p. 51). The classical author Diodorus explained the origin of animal worship by recalling the myth in which the gods, supposedly threatened by giants, hid under the guise of animals. The