Blinking Action on Horses at the Excitement

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Observation was made on the blinking action of horses at each time of rest, epirenamine injection, and additional stimulus of picking. The change of heart rate was used as index of excitement at that time. The results obtained are as follows. 1.Heart rate : It increased markedly by the injection of epirenamine. In some cases, it increased at the time of additional stimulus of picking. 2.Frequency of blinking : There were differences in frequency of blinking among animals at rest. This frequency increased by the injection of epire namine, but decreased markedly by the addition of stimulus of picking. The interval of blinking time was still irregular in both cases. 3.Blinking time : It was generally 0.38 second in the horses studied. The movement of opening the eyelids became slower than that of closing them. 4.Length of the eyelids : By the injection of epirenamine the eyelids increased in length markedly after they became narrow temporarily. This is contrary to the fact that the eyelids increase in length in man at psychic excitement. 5.The flutter : A phenomenon considered to be peculiar to horses, was recognized at a higher frequency than true blinking, though at irregular intervals.
日本ウマ科学会の論文