| dc.description | In 1947, Lung worm disease of sheep in North Dakota appeared to be due entirely to a single species, Dictyocaulus filaria. By 1947, several studies were already underway regarding the control and elimination of lung worms in sheep. Animals with adequate food and shelter frequently harbored many lung worms, but they seldom displayed any symptoms until their general resistance was lowered by other causes. It was concluded that North Dakota that lung worms could be eliminated as a factor in sheep production by use of liberal amounts of feed, control of gastrointestinal parasites and use of the phenothiazine salt mixture. | |
