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Fu D.,China Agricultural University | Zhang D.,China Agricultural University | Xu G.,China Agricultural University | Li K.,China Agricultural University | And 6 more authors.
Animal Science Journal | Year: 2015

Beijing-you is a Chinese local chicken which is raised for both meat and eggs. In the present study, we detected the effects of different rearing systems on growth, slaughtering performances and meat quality of Beijing-you chickens at 26-40 weeks of age. Six hundred Beijing-you hens were randomly allocated into two groups at 16 weeks of age and raised in free range or battery cage systems. The body weight, slaughtering performance and meat quality were measured for each group at the ages of 26, 30, 35 and 40 weeks. Some of the traits were dramatically influenced by the two systems, although most of them did not show significant changes. For the meat fiber microstructure, we found that the diameter of thigh and breast muscle fiber in the free range group were significantly increased than in the cage group (P<0.05) at 26 weeks of age. The ratio of fast muscle fiber in thigh muscle samples of the free range group was significantly reduced compared to that of cage group at both 35 (P<0.01) and 40 (P<0.01) weeks of age, indicating that the free range system could promote the transforming of fast muscle fiber to slow muscle fiber. © 2014 Japanese Society of Animal Science.

Wang C.,CAS Institute of Zoology | Luo J.,CAS Institute of Zoology | Wang J.,U.S. Center for Disease Control and Prevention | Su W.,CAS Institute of Zoology | And 9 more authors.
Integrative Zoology | Year: 2014

Outbreaks of H7N9 avian influenza in humans in 5 provinces and 2 municipalities of China have reawakened concern that avian influenza viruses may again cross species barriers to infect the human population and thereby initiate a new influenza pandemic. Evolutionary analysis shows that human H7N9 influenza viruses originated from the H9N2, H7N3 and H11N9 avian viruses, and that it is as a novel reassortment influenza virus. This article reviews current knowledge on 11 subtypes of influenza A virus from human which can cause human infections. © 2013 International Society of Zoological Sciences, Institute of Zoology/Chinese Academy of Sciences and Wiley Publishing Asia Pty Ltd.

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