Summary
Hypothalamic (T hy), spinal (T sc) and colonic (T c) temperatures were measured in Pekin ducks spontaneously dabbling for food in cold water (5° C). In agreement with observations in the pigeon and the fowlT hy was found to be consistently lower by about 0.5° C than the other core temperatures. The drop ofT hy during dipping head and neck into the cold water was not substantially greater than that ofT sc, while both changed more thanT c. The measurements do not support the assumption that the hypothalamic region in the duck is exposed to substantially greater temperature fluctuations than other thermosensitive parts of the body core.
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Schmidt, I., Simon, E. Temperature changes of the hypothalamus and body core in ducks feeding in cold water. Pflugers Arch. 378, 227–230 (1979). https://doi.org/10.1007/BF00592740
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DOI: https://doi.org/10.1007/BF00592740