| the development and survival of trichuris suis ova on pasture plots in the south of england. | pasture plots in the south of england were contaminated each month throughout 1975 with pig faeces containing trichuris suis ova. at regular intervals thereafter, soil samples were taken, the t suis ova extracted and their state of development noted. depending on the time of year that the plots were contaminated, ova required between 62 and 90 weeks to complete their development to the infective stage. little or no development occurred during winter. once the infective stage was reached, the ova ... | 1979 | 572984 |
| field observations on the longevity of trichuris suis ova. | | 1987 | 3629887 |
| a survey of gastrointestinal parasitism in pigs. | over a period of two years 180 pork pigs, 144 baconers and 144 sows from two slaughterhouses in northern england were examined for gastrointestinal parasites. sows showed the highest level and intensity of infection, 85 per cent harbouring the dominant parasites oesophagostomum dentatum and o quadrispinulatum; the highest worm burden recorded was 21,000. hyostrongylus rubidus was present in 28.5 per cent of sows but virtually absent from younger pigs. small numbers of ascaris suum and trichuris ... | 1980 | 7257108 |