The measurement of rectal and testis temperature in conscious mice, with observations on the effect of direct heating

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Abstract
The application of Newton''s law of cooling to freshly killed mice was inadequate for the prediction of their rectal of testis temperature. Improvements in the fitting process gave satisfactory results for rectal temperature only. A diffusion model was applied to testis cooling but was of no avail. A satisfactory correction factor was empirically determined. This method was applied to conscious mice whose hindquarters were immersed in a stirred oilbath at 34-42.degree. C for 1 h, and to controls. Both rectal and testis temperatures increased with bath temperature, producing a graph with a slope of only 0.5, indicating a regulatory capacity. Conscious, unanesthetized mice can maintain a testis temperature of 39.degree. C in a bath at 42.degree. C.