Histological Comparison and Analysis of Immune Organ between 42-day-old White Feather Broilers and Yellow Feather Broilers

JU Yu-xin;ZHAO De-bao;LI Xiao-mei;MA Jian-qing;WANG Xu-gang;SHI Zhao-guo;College of Animal Science and Technology, Gansu Agricultural University;Animal Husbandry(Veterinary Medicine) Station of Caotan Town of Kangle County of Gansu Province;Lanzhou Chai Tai Co.LTD.;

white feather broilers;;yellow feather broilers;;immune organs;;histological structure

The paraffin sections of bursa, spleen and thymus of 42-day-old white feather broilers and yellow feather broilers were prepared by using conventional histological slicing technique and HE staining method. The histological structures of them were observed and recorded by microphotography method, and the morphological variations of bursa, spleen and thymus tissues between 42-day-old white feather broilers and yellow feather broilers were compared. The results showed that compared with 42-day-old yellow feather broilers, the bursa lobules of white feather broilers with the same age were fewer, their cortex and medulla were more difficult to distinguish, massive vacuoles and interstitial connective tissue were distributed in lamina propria, and there were decreased numbers of lymphocytes, indicating that the immunologic function were declined. The white pulp and red pulp of white feather broilers spleen were obvious, the splenic corpuscle were markedly enlarged, the number of lymphocytes were increased and packed tightly, indicating the strong immunologic function. There were numerous basophilic small lymphocytes in cortex of white feather broilers thymus and more typical thymic corpuscle in medulla. The results of the study indicate that the rate of development and function establishment of immune organs of white feather broilers are earlier than those of immune organs of yellow feather broilers with the same age, and there are histological differences between the immune organs of the two species.