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  • Author or Editor: Harold. A. Pook x
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Brain stem auditory-evoked responses were recorded in 9 male and 11 female clinically normal mature dogs, weighing between 2 and 36 kg. Mean wave latency for the entire group of dogs, using 60-dB hearing level click stimuli at 11/s for waves I to VII was: 1.41, 2.21, 2.85, 3.31, 3.71, 5.12, and 6.46 ms, respectively. The mean interpeak latency for waves I and V (ipliv) was 2.32 ms. Neither gender nor ear effect was detectable.

Positive correlation was observed between cranium length, cranium width, nasion-external auditory meatus interval, and body weight for wave-V latency and ipliv. Such correlation was not documented for wave I. The regression equations for their effects on ipliv were: cranium length, y = 0.05x + 1.85; cranium width, y = 0.07x + 1.32; nasion-external auditory meatus interval, y = 0.05x + 1.79; and body weight, y = 0.01x + 2.15. On the basis of any of the 3 variables of cranium size or body weight, the study population could be classified into groups of large and small dogs, with the large group having significantly (P < 0.05) longer latency for wave V and ipliv. It is recommended that the effect of size variation in dogs on brain stem auditory-evoked responses should be compensated for by use of the regression equation based on cranium length.

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in American Journal of Veterinary Research