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 Thailand through a process of beatings to "mentally break" them, to make them submissive for the lucrative entertainment of tourists in tourist parks. Animal welfare advocates have called for better legislation and systems to document the origin of elephants in tourist camps and other locations across Thailand. Animal welfare in Thailand Animal welfare in Thailand relates to the treatment of animals in fields such as agriculture, hunting, medical testing and the domestic ownership of animals. It is distinct from animal conservation. Thailand introduced its first animal welfare law in 2014. The "Cruelty Prevention and Welfare of Animal Act, B.E. 2557 (2014)"