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1. Deep body temperature was measured daily in germ‐free and conventional chicks from 1 to 16 d of age.
2. The temperature of germ‐free chicks rose rapidly during the first 4 d and thereafter only slowly, whereas that of conventional birds increased gradually throughout.
3. Body temperature attained by the germ‐free birds was about 0.3 °C higher than that of conventional birds.
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