Cannulation techniques for the rumen, abomasum, duodenum and ileum of goats, sheep and steers were developed. The cannulas were made from polyethylene, basically consisting of barrel, outer and medial flange disk, and inner flange. The shape of inner flange was disk or gutter type. Disk type of inner flange was used for ruminal and abomasal cannulas, and intestinal reentrant cannulas. Gutter type was for single or reentrant cannulas of the intestine. The medial disk was installed between the digestive tract and the inner abdominal wall, ensuring the tight fit of the cannula in the abdominal wall. Additionally, a piece of elastic net sewn onto the digestive wall around the cannula barrel eliminated the leakage of digesta completely. These techniques and the device facilitated that the cannulas were not protruded from the side of animals. Ad libitum hay intake by steers recovered to 90 percentage of before surgery within 10 days, even when ruminal, duodenal and ileal cannulas were simultaneously installed by these methods.