Mouth Opening During Ridden Exercise in Sports Horses: An Evasive Behaviour, an Indication of Pain or Discomfort or a Physical Adjustment to Facilitate the Oral Passage of Air During Inspiratory Efforts 

Authors

  • T. Ahern Knockadoon Lodge, 17 Keymer Street, Ascot, 6104, Western Australia

DOI:

https://doi.org/10.12970/2310-0796.2019.07.03

Keywords:

 Horse, nosebands, isthmus fauciium, oropharyngeal seal, palatoplasty.

Abstract

 There had been mounting concern over the use of nosebands and in particular those regarded as being restrictive with the potential to cause stress to horses. It had been suggested that mouth opening during ridden exercise was primarily triggered by rider, tack, training or pain issues. At the same time the long held association between mouth opening and upper airways dysfunctions such as PI, DDSP and PD was being mostly ignored. It was therefore suggested that horses that were continually or intermittently attempting to open their mouths during ridden exercise should firstly undergo overground endoscopy to rule out upper airways issues, prior to exploring other potential causes. This particularly in light of more recent studies in sports horses as well as racehorses which had shown a high incidence of PI and DDSP in competition. If a dysfunction such as PI , DDSP or PD was diagnosed, then these issues should be addressed firstly. If successfully treated the need for tack such as a nosebands would be reassessed. 

References

Randle H, McGreevy P. The effect of noseband tightness on rein tension in the ridden horse. J Vet Behaviour 2013; 8: e18-e19. https://doi.org/10.1016/j.jveb.2012.12.042

Doherty O, Casey V, McGreevy P, Arkins S. An investigation into noseband tightness levels on competition horses. J Vet Behaviour 2016; 15: 83. https://doi.org/10.1016/j.jveb.2016.08.026

McGreevy P, Warren-Smith A, Guisard Y. The effect of double bridles and jaw-clamping crank nosebands on temperature of eyes and facial skin of horses. J Vet Behaviour 2012; 7(3): 142-148. https://doi.org/10.1016/j.jveb.2011.08.001

Fenner K, Yoon S, White P, Starling M, McGreevy P. TheEffect of noseband Tightening on Horses’ behaviour, Eye Temperature, and Cardiac Responses. PLOS ONE 2016; 11: e0154179. https://doi.org/10.1371/journal.pone.0154179

Brown SM, Connor M. Understanding and Application of Learning Theory in UK based Equestrians. Anthrozoos 2017; 30(4): 565-579. https://doi.org/10.1080/08927936.2017.1370216

Warren-Smith AK, McGreevy PD. Equestrian Coaches Understanding and Application of Learning Theory in Horse Training. Anthrozoos: A Multidisciplinary J of the Interactions of People and Animals 2008; 21(2): 153-162. https://doi.org/10.2752/175303708X305800

Allen KI, Franklin S. Characteristics of palatal instability in Thoroughbred racehorses and their association with the development of dorsal displacement of the soft palate. Equine Vet J 2013a; 45(4): 454-459. https://doi.org/10.1111/evj.12004

Allen KI, Franklin S. The effect of palatal dysfunction on measures of ventilation and gas exchange in Thoroughbred racehorses during high intensity exercise. Equine Vet J 2013b; 45(3): 350-354. https://doi.org/10.1111/j.2042-3306.2012.00627.x

Cook WR. Clinical observations on the equine soft palate. in: Proceedings BEVA, 1st Annual Cong 1962; pp. 5-10.

Barakzai SZ, Hawkes CS. Dorsal displacement of the soft palate and palatal instability. Equine Vet Edu 2010; 22(5): 253-264. https://doi.org/10.1111/j.2042-3292.2010.00060.x

Van Erck E. Dynamic respiratory videoendoscopy in ridden sport horses: effect of head flexion, riding and airway inflammation in 129 cases. Equine Vet J 2011; 43(40): 18-24. https://doi.org/10.1111/j.2042-3306.2011.00492.x

Cercone M, Olsen E, Perkins JD, Cheetham J, Mitchell M, Ducharme NG. Investigation into pathophysiology of naturally occurring palatal instability and intermittent dorsal displacement of the soft palate (DDSP) in racehorses: Tyrohyoid muscles fatigue during exercise. PLOS ONE 2019; 18: e0224524. https://doi.org/10.1371/journal.pone.0224524

Lane JG, Bladon B, Little DM, Naylor JR, Franklin SH. Dynamic obstructions of the equine upper respiratory tract. Part 1: observations during high-speed treadmill endoscopy of 600 Thoroughbred racehorses. Equine Vet J 2006a; 38(5): 393-399. https://doi.org/10.2746/042516406778400583

Franklin SH, Naylor JR, Lane JG. Videoendoscopic evaluation of the upper respiratory tract in 93 sport horses during exercise testing on a high-speed treadmill. Equine Vet J Suppl 2006; 36: 540-545. https://doi.org/10.1111/j.2042-3306.2006.tb05601.x

Cook WR. A hypothetical, aetiological relationship between the horse’s bit, nasopharyngeal asphyxia and negative pressure pulmonary oedema. Equine Vet Edu 2014; 26(7): 381-389. https://doi.org/10.1111/eve.12196

Ahern TJ. Acquired pharyngeal dysfunction (APD). J Equine Vet Sci 1993; 13(3): 125-128. https://doi.org/10.1016/S0737-0806(07)80056-6

Ahern TJ. Pharyngeal Dysfunction During Exercise, including Disruption of the Oropharyngeal Seal (OPS) and Dorsal Displacement of the Soft Palate (DDSP). J Equine Vet Sci 1999; 19(4): 226-231. https://doi.org/10.1016/S0737-0806(99)80309-8

Kannegieter NJ, Dore ML. Endoscopy of the upper respiratory tract during treadmill exercise: A clinical study of 100 horses. Aus Vet J 1995; 72(3): 101-107. https://doi.org/10.1111/j.1751-0813.1995.tb15020.x

Townsend N. Diagnosis and treatment of fourth branchial arch defects. Equine Vet Edu 2013; 25(6): 278-281. https://doi.org/10.1111/eve.12036

Barakzai SZ, Finnegan C, Dixon,PM, Hillyer MH, Boden LA. Use of tongue ties in thoroughbred racehorses in the United Kingdom, and its association with surgery for dorsal displacement of the soft palate. Vet Record 2009; 165(10): 278-281. https://doi.org/10.1136/vr.165.10.278

Johnson JH. Equine Endoscopy, In: Veterinary Scope, 1975; XIX: 2-11.

Ahern T. The modified oral plalatopharyngoplasty or modified Ahern procedure. World J Vet Sci 2018; 6: 33-37. https://doi.org/10.12970/2310-0796.2018.06.07

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Published

2019-03-25

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