title: Occurrence of subgroup J avian leukosis virus in Taiwan.
abstract: There are three grandparent farms for three different chicken breeds in Taiwan. One of these farms, populated by breast meat yield chickens (yield type), suffered from a severe subgroup J avian leukosis virus (ALV-J) infection in mid-1997. The affected flocks at that farm had a weekly mortality of more than 1% and a 15% drop in egg production. The broilers from that breed had a 10% condemnation rate during the first week of age, and 5% of the remaining broilers were stunted afterwards. Some chickens had myeloid leukosis lesions at 6 weeks old. Their survivability was about 85%. However, chickens at the other two grandparent farms, populated with non-yield chickens (regular type), were also infected by ALV-J and showed myeloid leukosis. However, chickens at these farms produced progeny whose survivability reached more than 95%. ALV-J caused greater economic loss in yield type chickens than in regular type chickens in Taiwan.
authors.affiliation: Department of Veterinary Medicine, National Taiwan University, P. O. Box 23-3, Taipei 106, Taiwan. Chingho@ccms.ntu.edu.tw
authors.forename: C-H
authors.initials: CH
authors.lastname: Wang
authors.forename: Y-W
authors.initials: YW
authors.lastname: Juan
mesh_terms: D000818:Animals; D001353:Avian Leukosis / Q000453:epidemiology*; D001354:Avian Leukosis Virus / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D002645:Chickens; D017931:DNA Primers; D004196:Disease Outbreaks / Q000662:veterinary; D005260:Female; D010058:Oviposition; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012703:Serotyping; D013624:Taiwan / Q000453:epidemiology
chemical_list: D017931:DNA Primers