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Lameness Assessment by Wireless Sensors (Lameness Locatortm (LLtm)) Is Not Affected by the Use of Xylazine or Acepromazine
F. De La Corte
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Introduction
An objective method of detecting lameness based on the transmission of data from wireless inertial sensors (LL™) was developed to assist in the evaluation of subtle lameness. Young and nervous animals may show erratic head movements that may affect data collecting. Our goal was to investigate the potential influence of acepromazine or xylazine use on the gait of horses of different temperaments.
Methods
Twenty adult horses, between 8-16 years, of various breeds and degrees of lameness were examined according the protocol recommended. On the first day the horses were pulled at the trot in a straight line before and 5 minutes after administering intravenously acepromazine (0.025mg/kg). The next day the tests were repeated using xylazine (0.25mg/kg). The data a1/a2 (ratio between the amplitude of vertical movement (AMV) of the head produced by AMV baseline lameness and head), diffmax (difference maximum height of the head) and diffmin (difference the minimum height of the head) of the forelimb and hind limb were based on specific algorithms for LL™.
Results and discussion
The use of acepromazine or xylazine did not interfere in the values of a1/a2, and diffmax or diffmin at a significance level of p<0,05. The use of acepromazine reassures the animal only reducing spontaneous motor activity, resulting in lower incidence of aberrant movements of the head, which could interfere with the reading of the sensors. It is possible that the analgesic effect of mild sedatives such as xylazine, may mask a slight limp, but this was not observed.
Conclusion
The use of xylazine or acepromazina at the dosage tested here is not detrimental to the lameness exam by LL™.
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