Abstract
Summary
Serum insulin, growth hormone and thyroxine levels were determined in rats of five inbred strains and one out-bred stock. Insulin levels were higher in the Wistar-Lewis/MAI than all other rat strains. Growth hormone was significantly increased in ARS-SD:SPF(SD) and Wistar-Lewis/MAI rats. All rats demonstrated low serum thyroxine levels in the range of 19.1-44.2 ng/ml. Higher insulin and growth hormone levels were attributed to the increase in body wt.
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