The Effect of Noseband Tightening on Horses’ Behavior, Eye Temperature, and Cardiac ResponsesReportar como inadecuado




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Restrictive nosebands are common in equestrian sport. This is concerning, as recent evidence suggests that very tight nosebands can cause a physiological stress response, and may compromise welfare. The objective of the current study was to investigate relationships that noseband tightness has with oral behavior and with physiological changes that indicate a stress response, such as increases in eye temperature measured with infrared thermography and heart rate and decreases in heart rate variability HRV. Horses n = 12 wearing a double bridle and crank noseband, as is common in dressage at elite levels, were randomly assigned to four treatments: unfastened noseband UN, conventional area under noseband CAUN with two fingers of space available under the noseband, half conventional area under noseband HCAUN with one finger of space under the noseband, and no area under the noseband NAUN. During the tightest treatment NAUN, horse heart rate increased P = 0.003, HRV decreased P < 0.001, and eye temperature increased P = 0.011 compared with baseline readings, indicating a physiological stress response. The behavioral results suggest some effects from bits alone but the chief findings are the physiological readings that reflect responses to the nosebands at their tightest. Chewing decreased during the HCAUN P < 0.001 and NAUN P < 0.001 treatments. Yawning rates were negligible in all treatments. Similarly, licking was eliminated by the NAUN treatment. Following the removal of the noseband and double bridle during the recovery session, yawning P = 0.015, swallowing P = 0.003, and licking P < 0.001 significantly increased compared with baseline, indicating a post-inhibitory rebound response. This suggests a rise in motivation to perform these behaviors and implies that their inhibition may place horses in a state of deprivation. It is evident that a very tight noseband can cause physiological stress responses and inhibit the expression of oral behaviors.



Autor: Kate Fenner , Samuel Yoon, Peter White , Melissa Starling , Paul McGreevy

Fuente: http://plos.srce.hr/



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