The “Spring Rise” in the Nematode Egg-Count of Sheep

Abstract
1. Observations carried out on four groups of sheep during the spring of 1954 are described. 2. A spring-rise in the worm-egg output was found to occur in all the groups studied. 3. The management of the animals precluded rcinfestation during the spring and, in two instances, from 8th January and 22nd, respectively. 4. Time of lambing and nutritional level appeared to influence the onset and magnitude of the spring increase.