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Clinically healthy 12 female Manina breed chicken (6 of 75 days old : group 46 of 145 days old： group B, female) were examined to establish physiological basic data on organ tissues total Creatine phosphokinase (CPK) activities and CPK isoenzymes fractions. The tissues examined were the Lung, Heart, Liver, Proventriculus, Gizzard, Duodenum, Colon and Muscle. The results obtained were summarized as follows : 1. Total CPK activities were high with decreasing order of the Muscle > Proventriculus >Giz-zard >Heart >Duodenum> Colon >Lung >Liver in group A and Muscle >Proventriculus >Giz-zard >Heart > Colon >Duodenum > Lung > Liver in group B. Significance of total CPK activities in group difference was only found Colon, group B showed higher values than that of group A (p< 0.01). 2. In the pattern of CPK isoenzymes fractions, Lung, Heart, Liver, Proventriculus, Gizzard, Duodenum and Muscle were high with decreasing order of CK2 >CK3, Colon showed the pattern with decreasing order of CK3 >CK2. Significance of CPK isoenzymes fractions in group difference was only found Liver, CK2 in group B(P<0.01) and CK3 in group A(P<0.01) were higher than that of the other group.
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