Masaoki  Tsudzuki, Takashi  Bungo, Jun-ichi  Shiraishi, Naoki  Goto, Tatsuhiko  Goto, 
    Comparison of Growth Curves of Four Breeds of Japanese Native Chicken, Onaga-Dori, Tosa-Jidori, Ukokkei and Hinai-Dori,
    Journal of Animal and Veterinary Advances,
    Volume 9,Issue 9,
    2010,
    Pages 1362-1365,
    ISSN 1680-5593,
    javaa.2010.1362.1365,
    (https://makhillpublications.co/view-article.php?doi=javaa.2010.1362.1365)
    Abstract: The objective of this study was to compare the growth curve parameters for body weight of Japanese native chickens (Onaga-dori, Tosa-jidori, Ukokkei and Hinai-dori) using a non-linear model, Gompertz function.  The data were collected from the four indigenous breeds together with two foreign breeds (White Plymouth Rock and Brown Leghorn) that were reared from 0 day old to 20 weeks of age.  Breed differences were observed in the growth parameters. The predicted mature weight of the Hinai-dori was heavier than the other three Japanese native breeds. Tosa-jidori was observed to be late maturing and lighter at maturity, while Ukokkei was shown to have a higher growth rate. The development of growth curves for indigenous breeds may be useful in selecting native Japanese chickens that have rapid growth at early ages.
    Keywords: Growth curve;Onaga-dori;Tosa-jidori;Ukokkei;Hinai-dori;Japanese native chickens