tracheostomies of 19 ponies and the horse were examined in june 1986 and evaluated for vertical length of stomal orifice ( mean = 25.0 +/- 4.7 mm in the ponies and 55 mm in the horse ) , degree of tracheal obstruction ( 0/20 ) , regrowth and apposition of epidermis ( 3/20 ) , and whether or not stomal airflow occurred with nasal occlusion ( 20/20 ) .
C0040590
tracheostomies
C0040578
tracheal