Abstract:

In order to reasonably develop the hair of Tianzhu White yak, the article studied organizational structure and ultrastructure of Tianzhu white yak by optical microscopy and scanning electron microscopy. The results indicted that in respect to organizational structure and ultrastructure，the heterotypical hair and fuzz hair in different parts of the Tianzhu white yak body are similar, while there exist some differences in organizational structure of coarse hair fibers in different parts of the body, in particular, the structure of the medullated fibers. The scale layer structure of different types of fiber varies and the scale density is coarse hair > heterotypical hair > fuzz hair, and significant difference (P <0.01) exists between the fuzz hair and coarse hair. As to the change of scale height and thickness：fuzz hair> heterotypical hair > coarse hair, and significant difference(P <0.05) exhibits between the fuzz hair and the coarse hair.