The spring-rise phenomenon: seasonal changes in the worm burdens of breeding ewes and in the availability of pasture infection.
D000018:Abomasum / Q000382:microbiology; D000818:Animals; D005243:Feces / Q000382:microbiology; D007420:Intestine, Large / Q000382:microbiology; D007421:Intestine, Small / Q000382:microbiology; D009348:Nematoda / Q000302:isolation & purification*; D009349:Nematode Infections / Q000382:microbiology / Q000662:veterinary*; D012621:Seasons; D012756:Sheep; D012757:Sheep Diseases / Q000382:microbiology*