W. Aengwanich  , 
    Effects of High Environmental Temperature on Packed Cell Volume of Thai Indigenous, Thai Indigenous Crossbred and Broiler Chickens,
    Journal of Animal and Veterinary Advances,
    Volume 6,Issue 9,
    2007,
    Pages 1088-1090,
    ISSN 1680-5593,
    javaa.2007.1088.1090,
    (https://makhillpublications.co/view-article.php?doi=javaa.2007.1088.1090)
    Abstract: A study of the effects of high environmental temperatures on the packed cell volume of Thai Indigenous Chickens (TIC), Thai Indigenous Chickens Crossbred (TICC) and Broilers (BC) was made and a comparison of the effects to the 3 breeds was undertaken. One kilogram of representative males and females of each of the 3 breeds were maintained in the environmental temperature range of 26&plusmn;2 and 38&plusmn;2°C. Packed cell volumes were investigated on day 1, 7, 14, 21 and 28 of an experimental period. The results revealed the following information: On day 1, the packed cell volume of chickens maintained at 26&plusmn;2°C was significantly lower than that of chickens at 38&plusmn;2°C (p< 0.05). On day 7, 14, 21 and 28, the packed cell volume of chickens maintained at 26&plusmn;2°C was significantly higher than that of chickens at 38&plusmn;2°C (p< 0.05). On day 7, 14, 21 and 28 of experimental period, at 38&plusmn;2°C, the packed cell volume of the TIC was significantly higher than that of the TICC and BC (p< 0.05). This experiment showed that the TIC was more tolerant to high environmental temperatures than the TICC and BC.
    Keywords: High environmental temperature;packed cell volume;thai indigenous chickens;thai indigenous chickens crossbred;broilers