Changes of Myosin ATPase Activities and Their Visceral Indices in Spermophilus dauricus Muscle During Postnatal Development
-
-
Abstract
Eighteen Spermophilus dauricus were divided according to age into the young group, the sub-adult group and the adult group. The activities of myosin ATPase (mATPase) of the soleus muscle were detected using the mATPase method. The percentages of TypeⅠandⅡ fibres were then determined. The viscera weight and viscera index were measured and calculated. The results revealed: (1) The proportion of TypeⅡ fibres in the soleus muscle were notably lower in the adult and the sub-adult than in the young of S. dauricus; and compared with the sub-adult, the adult showed a significant decrease; (2) the thymus index in young S. dauricus was markedly higher than those of the sub-adult and the adult, the splenic index (SI) in young S. dauricus was markedly higher than that of the sub-adult, whereas the hepatic index (HI) was distinctly lower than those of the sub-adult and the adult. When compared with the sub-adult, the hepatic index of the adult was sharply higher, whereas the other indices showed no significant variation between the two groups. In summary, the proportion of Type Ⅱ fibres gradually decreased with age, both the thymus and the splenic index also decreased with age, whereas the hepatic index gradually increased. These results suggest that the activities of mATPase decline during postnatal development in S. dauricus.
-
-
DownLoad: