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 welfare in the United Kingdom have been passed by the Northern Ireland Assembly. , the Bill is awaiting royal assent. The amendments give Northern Ireland the toughest penalties for animal cruelty anywhere in the UK or Ireland. The maximum sentence available for cases heard in Magistrates Courts have increased from six to twelve months. The maximum fine has risen from £5,000 to £20,000. In Crown Courts, where more serious cases are heard, the maximum sentence for animal cruelty has increased from two to five years. Animal welfare in the United Kingdom Animal welfare in the United Kingdom relates to the treatment of animals in fields