| the infectivity of some nematode parasites of reindeer (rangifer tarandus l.) and elk (alces alces l.) for cattle and sheep. | cross infections were carried out by dosing parasite-free calves and lambs with third stage nematode larvae cultured from the faeces of reindeer and elk. two lambs each received 20,000 larvae from reindeer, and one lamb 20,000 larvae from elk. one calf received 50,000 larvae from reindeer and one 50,000 from elk. the animals were killed 28 days after infection. egg output did not differ significantly between the lambs nor between the calves, but in the lambs the output was much higher than in th ... | 1982 | 7113357 |
| worm burdens of dairy heifers in england and wales. | the size and composition of abomasal worm burdens from 143 casualty and cull dairy heifers were estimated. over 60 per cent had totals of less than 10,000, only four exceeded 100,000 and the overall mean was 16,285. ostertagia ostertagi was almost always present and usually formed the major proportion of the total. trichostrongylus axei was recorded in 83 heifers and was the most common species on 17 occasions. the numbers of arrested early fourth stage worms were highest in winter and declined ... | 1981 | 7197843 |