Steers were surgically
fitted with abomasal and ruminal infusion catheters
constructed of medical-grade Tygon tubing (64-mm
i.d. × 80-mm o.d.) fitted with a 1.3-cm medical-grade
Tygon cuff (Norton Performance Plastics, Akron, OH)
and a Teflon O-ring (3.8-cm diam., Ace Hardware, Nicholasville,
KY) positioned 3.8 cm distal to the tip of the
catheter.