1. Department of Science and Technology, Graduate School of Medicine, Science and Technology, Shinshu University, Kami-ina, Nagano 399-4598,Japan
2. Poultry Center, Cooperative Agricultural Research Center (CARC). Prairie View A&M University, College Station, TX 77843, United States of America
3. Department of Agricultural and Life Sciences, Faculty of Agriculture, Shinshu University, Kami-ina, Nagano 399-4598, Japan
4. Laboratory of Animal Functional Anatomy (LAFA), Faculty of Agriculture, Shinshu University, Kami-ina, Nagano 399-4598, Japan