| control of ostertagia ostertagi infections in australia. | the control of ostertagia ostertagi infections in australia is aimed specifically at young cattle in their first and second year of grazing after weaning. mature breeding stock are not routinely treated. the recommended strategy is preventive, using an integrated approach of timed anthelmintic treatments in relation to the epidemiology of ostertagiasis in different environments. best results are obtained when treatments, given at weaning and 6 months later, are combined with a move to 'safe' pas ... | 1988 | 3284168 |
| seasonal availability of nematode larvae on pastures grazed by cattle in new south wales. | trends in the numbers of infective menatode larvae on pasture plots contaminated by cattle at different seasons of the year were defined in 3 different climatic regions. the main nematodes were ostertagia ostertagi, trichostrongylus spp, haemonchus spp and cooperia spp. on the north coast of new south wales with a sub-tropical climate, the numbers of infective larvae of all 4 nematodes rose rapidly to peak levels soon after each seasonal period of contamination began, then fell quickly within a ... | 1980 | 7436894 |
| seasonal changes in the structure of nematode populations of cattle in new south wales in relation to inhibited larval development. | pasture plots in 3 climatic regions were contaminated with worm eggs of ostertagia ostertagi, trichostrongylus axei, haemonchus spp and cooperia spp in the autumn, winter and spring. successive pairs of parasite-free calves were grazed on the plots for 7 to 10 days at 4-week intervals and then killed for worm counts 14 days after their removal from pasture. on the northern tablelands of new south wales, irrespective of the season of pasture contamination, the degree of inhibition of o. ostertagi ... | 1980 | 7436895 |
| inhibited development of ostertagia ostertagi in relation to production systems for cattle. | on a coastal farm in new south wales where beef and dairy cattle production was carried on side-by-side, separate pasture plots were contaminated with eggs of ostertagia ostertagi by calves from each production system in autumn, winter or spring. successive groups of parasite-free tracer calves grazed on the plots for 14 days at 4-week intervals and were then killed for worm counts 14 days after removal from pasture. on all plots, the proportion of inhibited early 4th-stage larvae in tracer calv ... | 1982 | 7122124 |
| studies on nematode infections of beef cattle in new south wales. | the occurrence and seasonal trends of nematode parasite infections in beef cattle on the tablelands and north coast regions of new south wales are described, based on worm counts from 627 spring-born steers slaughtered at 2-monthly intervals from 6 to 24 months of age. the predominant parasites were ostertagia ostertagi, trichostrongylus axei and cooperia spp. large burdens of adult ostertagia were seen in 12-month-old animals in late winter and early spring, and later in 18- to 20-month-old cat ... | 1977 | 614021 |