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T. E. Gibson

Bio: T. E. Gibson is an academic researcher. The author has contributed to research in topics: Ecology (disciplines). The author has an hindex of 1, co-authored 1 publications receiving 56 citations.

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Book ChapterDOI
TL;DR: This chapter discusses the epidemiology and control of nematode infections of grazing animals, the consequence of exposing insufficiently resistant animals to grazing that is too heavily infected so that they pick up infective larvae at an excessive rate.
Abstract: Publisher Summary This chapter discusses the epidemiology and control of nematode infections of grazing animals. The disease resulting from nematode infections is the consequence of exposing insufficiently resistant animals to grazing that is too heavily infected so that they pick up infective larvae at an excessive rate. The disease producing infection is acquired over a relatively short space of time, in some cases because the animals quickly become refractory to infection, in others because worm numbers are regulated in the host to maintain a level proportional to the rate at which new infection is acquired. The number of generations of the parasites involved in the process of auto-infestation is always small. This is either because of the rapid development by the host of a resistance to reinfection or because of the long time taken for the free living phase of the life cycle to be completed. In some cases both factors operate. Disease because of the simple transmission of infections can be avoided by withholding groups of susceptible animals from pasture contaminated by other groups. The choice of control measures where disease is because of auto-infestation depends on how the number of generations involved is normally limited.

233 citations

Journal ArticleDOI
J. Armour1
TL;DR: The factors which precipitate production loss due to helminth disease in farm animals are classified within accepted epidemiological principles.

159 citations

Journal ArticleDOI
TL;DR: Systems of parasite control which depend on frequent dosing with anthelmintics, and are relatively independent of production systems, have been advocated widely, and have certainly given good immediate results but in the long term may prove to be unsatisfactory.

107 citations

Book ChapterDOI
C.B. Ollerenshaw1, L.P. Smith1
TL;DR: The meteorological factors and the forecasts of helminthic disease are discussed, which maintain a high environmental pressure on the parasite, high mortality ensues and the population is maintained in check.
Abstract: Publisher Summary This chapter discusses the meteorological factors and the forecasts of helminthic disease. With some helminthic diseases, for example parasitic gastroenteritis in sheep, several different species of nematodes may be involved. These are unlikely to show identical responses to changes in weather or host. Even where single species are involved, different stages in the life cycle may respond differently to changes in weather and, for example, the nematode egg is usually more resistant to desiccation than the larva. Assessing the role of climate on helminth parasites requires the important disease-free years when, seemingly, the parasite population is reduced to an innocuous level. It is important to recognize that the level of the parasite population is determined by the interaction between the high reproductive potential of the parasite and the variable limiting factors (mainly meteorological) in the environment. Normally, these limiting factors maintain a high environmental pressure on the parasite, high mortality ensues and the population is maintained in check.

105 citations

Journal ArticleDOI
TL;DR: Seasonal rates of diagnosis suggest that, in line with increases in temperature, fewer larvae of Teladorsagia and Trichostrongylus species survive the winter and spring at pasture, while the windows of transmission of these species, and of Haemonchus contortus, have extended into the autumn.

105 citations