| occurrence of subgroup j avian leukosis virus in taiwan. | 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 chic ... | 2002 | 12427337 |