| abomasal nematodes in cattle in ontario. | during 1970, 93 abomasa from cattle in ontario were examined, and from 63 of these abomasa nematode species of the genera ostertagia, haemonchus and/or trichostrongylus axei were recovered. the abomasa were from cattle six months to two years of age and were collected either from the postmortem room at the ontario veterinary college or from two abattoirs near guelph. the numbers of worms per abomasum were estimated and their genera were identified from a one-twentieth volume of the washings and ... | 1974 | 4272952 |
| overwintering of bovine gastrointestinal nematodes in southwestern ontario. | several steers, reared in isolation until approximately six months of age, were placed on a small isolated enclosed pasture from late spring to late fall of 1970, 1971 and 1972. the pasture was left vacant and unused during the winters and early springs. the pasture had been used in previous years by cattle, and in the late spring of 1970 was grazed by cattle know to be passing gastrointestinal nematode eggs in their feces. the steers were slaughtered periodically, and the prevalence of nematode ... | 1974 | 4272963 |
| a longitudinal study of gastrointestinal parasites in canadian dairy farms. the value of an indirect ostertagia ostertagi elisa as a monitoring tool. | the general objective of this study was to evaluate a crude ostertagia ostertagi antigen enzyme-linked immunosorbent assay (elisa) for monitoring gastrointestinal parasites in lactating dairy cattle. a longitudinal study of gastrointestinal parasites in lactating dairy cows was carried out in 38 herds in four provinces of canada (prince edward island, quebec, ontario and saskatchewan) from september 1999 to october 2000. bulk tank milk, cow milk, serum and fecal samples were collected monthly or ... | 2002 | 12127251 |