Stabling causes a significant increase in the pH of the equine airway

Equine Vet J. 2009 Dec;41(9):940-3. doi: 10.2746/042516409x474383.

Abstract

Regulation of pH homeostasis in the equine lung is poorly understood. Measurement of exhaled breath condensate (EBC) pH provided a simple, highly repeatable and noninvasive method for the longitudinal investigation of changes in airway pH in response to environmental changes. Stabling of horses was found to lead to a small (approximately 100-200 parts/billion) but significant (P < 0.001) increase in ambient ammonia concentration when compared to pasture. This increase in exposure to ambient ammonia concentration was associated with significant (P = 0.002) increases in EBC pH and exhaled ammonia (P = 0.013). Stable feed/bedding management type had no effect on EBC pH or exhaled ammonia concentration, while ambient ammonia concentration was influenced by stable management type.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Ammonia / adverse effects
  • Animal Husbandry*
  • Animals
  • Breath Tests / methods
  • Homeostasis
  • Horses
  • Hydrogen-Ion Concentration
  • Respiratory Physiological Phenomena
  • Respiratory System / chemistry*
  • Respiratory System / drug effects

Substances

  • Ammonia