Department of Veterinary Science
The 1944 figure was 766,600 sheep for that area, showing more than 100 percent increase in a 20-year period. Between 1944 and 1950 sheep numbers declined in these six counties to 299,000. At least three factors accounted for the decrease after 1944: (1) the difficulty in obtaining labor; (2) favorable prices for cattle which could be raised with less labor; and (3) the prevalence of losses of lambs on range from dysentery, a condition that had existed for 5 to 7 years. It was the seriousness of the lamb losses that prompted the work reported here.
Northwestern South Dakota sheep parasites
South Dakota Experiment Station, South Dakota State College of Agriculture and Mechanical Arts
Harshfield, B. S.; Carlson, F. N.; and Dorsey, T. A., "Observations on Parasitism in Sheep in Northwestern South Dakota" (1955). Research Bulletins of the South Dakota Agricultural Experiment Station (1887-2011). 447.