S tudies w ere m ade on th e ac tiv ity of th e follow ing blood serum enzym es: alkaline phosphatase (AP) and phosphocreatine k in ase (CPK) in 84 voles eith er 30 or 60 days old, obtained from sp rin g an d au tu m n seasonal generations. The body w eight of 30-and 60-day old voles b o rn in spring w as g re a te r th a n th a t of ro d en ts of th e sam e age born in a u tu m n (P < .001, .005 < P
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