Relationship of IGF-I mRNA Levels to Tissue Development in Chicken Embryos of Different Strains

  • Kita, K. (Graduate School of Bioagricultural Sciences, Nagoya University) ;
  • Noda, C. (Graduate School of Bioagricultural Sciences, Nagoya University) ;
  • Miki, K. (Nagoya University Bioscience Center, Nagoya University) ;
  • Kino, K. (Aichi-ken Agricultural Research Center) ;
  • Okumura, J. (Graduate School of Bioagricultural Sciences, Nagoya University)
  • Received : 2000.06.01
  • Accepted : 2000.07.25
  • Published : 2000.12.01


Insulin-like growth factor-I (IGF-I) mRNA levels in the eyes, heart, liver and breast muscle removed from dwarf egg-type, normal egg-type and normal meat-type chicken embryos at 7, 14 and 20 days of incubation were measured. There was no influence of chicken strain on IGF-I gene expression in the eyes and liver. The IGF-I gene expression in eyes increased significantly along with the incubation period. In the liver, IGF-I gene expression at 20 days of incubation was significantly higher than that at 14 days of incubation. In the muscle, the lowest value for IGF-I gene expression was observed in meat-type chicken embryos. Regression analysis revealed that IGF-I gene expression was significantly correlated to the weights of the eyes and liver, but not the muscle. We conclude that there is little influence of strain on tissue IGF-I gene expression in chicken embryos during incubation but that tissue development in chicken embryos is nevertheless at least partly regulated by the change in IGF-I gene expression.


Chicken Embryo;Insulin-Like Growth Factor-I;mRNA;Dwarf;Broiler


Supported by : Ministry of Education, Science and Culture, Japan

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