Page 685 - The Veterinary Care of the Horse
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Figure 15.14 Milky white nasal discharge may be seen especially first thing in the morning or after exercise
As the condition progresses:
• breathing out requires even more effort and there is considerable movement of the
abdominal muscles; this is known as ‘heaving’
• the abdominal muscles become overdeveloped and a ‘heave line’ is seen (Figure 15.15)
• the respiratory rate increases further
• expiratory airflow at the nostrils is biphasic
• the horse’s anus moves in time with the respirations
• the nasal discharge may become thick and yellow
• the horse coughs at rest in the stable
• lumps of mucus are coughed up (Figure 15.16)
• wheezing and crackling lung sounds may be heard with a stethoscope.
