The Probable Explanation for the Difference in the Localization of Adult Trichinella spiralis in Young and Old Mice

Larsh, John E.; Hendricks, J. R.

doi:10.2307/3273393

Cited by 29 publications

(19 citation statements)

References 5 publications

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“…Whether this conclusion would apply if a similar experiment was carried out with groups of sheep of successively increasing ages is open to investigation, as it has been previously shown in other host-parasite systems that age of host was an influence on the intestinal distribution of parasites, e.g. with Trichinella spiralis (Larsh and Hendricks, 1949), and Nematospiroides dubius (Dobson, 1962) in mice.…”

Section: Discussionmentioning

confidence: 95%

Trichostrongylus vitrinus: The influence of age of sheep and population size on the intestinal distribution

Taylor¹,

Kilpatrick²

1980

J. Helminthol.

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Two age groups of parasite-free lambs, 4 months and 8 months, were infected with 50 000 infective larvae (L3) of T. vitrinus. A further group of 8 month old lambs were infected with 250 000 L3 T. vitrinus. The lambs were slaughtered at intervals after infection, and the size and linear distribution of their intestinal worm burdens examined and compared statistically. After the 50 000 L3 infections, it was found that a higher percentage of the initial inoculum had become established in the younger lambs but that there were no differences between the intestinal distributions of the population in either age group.After infection with 250 000 L3, the percentage of the larvae retained changed with time. Up to sixteen days post infection, 38% of the larvae administered were retained; thereafter the percentage fell to 22%. The linear distribution of the population in this size of infection showed that a significantly greater percentage was present between 4.8 and 7.2 metres distal to the pylorus when compared with that after infection with 50 000 L3.

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Section: Discussionmentioning

confidence: 95%

Trichostrongylus vitrinus: The influence of age of sheep and population size on the intestinal distribution

Taylor¹,

Kilpatrick²

1980

J. Helminthol.

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“…Adult N. brasiliensis migrate anteriorly within the intestine during the course of infection (Chandler, 1935;Brambell, 1965;Alphey, 1970;Connan, 1974). Most adult T. spiralis are usually found in the anterior half of the small intestine in old mice (Larsh and Hendricks, 1949) and in some strains of mouse there is a migration down the small intestine prior to expulsion (Larsh et al, 1972). These movements of worms have been attributed to metabolic and immunologic factors, but there is mounting evidence that the migration of worms from a site of preference during early infection, to another part of the intestine, is mainly due to the immune response of the host (Alphey, 1970;Connan, 1974).…”

Section: Methodsmentioning

confidence: 99%

Strongyloides ratti: 1. Parasitological observations on primary and secondary infections in the small intestine of rats

Moqbel

Denham

1977

J. Helminthol.

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“…nana var. fraterna) and the nematodes Ascaris lumbricoides and Trichinella spiralis has been established by Larsh (1947Larsh ( , 1950 and Larsh & Hendricks (1949). These workers were able to increase the number of helminths becoming established by slowing the intestinal emptying time.…”

Section: Discussionmentioning

confidence: 98%

“…An association between the rate of flow of ingesta and the extent of establishment and survival of parasitic helminths in the intestines of animals has been recorded (Larsh, 1947(Larsh, , 1950Larsh & Hendricks, 1949).…”

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confidence: 99%

The effects of nematode parasitism on the rate of passage of food residues through the alimentary tract of sheep

Bawden

1970

Br J Nutr

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I . The mean retention time of stained food residues was longer in sheep maintained on 2. Infection of sheep with 1500 infective Oesophagostomum columbianum juveniles was 3 . The extent to which the mean retention times were increased was associated with the 4. It was noted that an increase in mean retention time following infection was associated .The results are discussed in relation to the pathogenesis and survival of 0. columbianum a chopped straw ration than in sheep maintained on a chopped lucerne ration. Infection of young sheep with the parasitic nematode Oesophagostomum columbianum, especially those maintained on a low plane of nutrition, results not only in anorexia but also in decreased efficiency of utilization of ingested nutrients (Bawden, 1969a). Blaxter, Graham & Wainman (1956) noted that the efficiency of utilization of nutrients was influenced in ruminants by the rate of flow of ingesta through the alimentary tract and that this was directly correlated with the amount of feed consumed.An association between the rate of flow of ingesta and the extent of establishment and survival of parasitic helminths in the intestines of animals has been recorded (Larsh, 1947(Larsh, , 1950Larsh & Hendricks, 1949).The investigation described below was carried out to examine the interrelationships between the nutritional status of sheep and nematode parasitism with respect to the rate of flow of food residues through the alimentary tract. E X P E R I M E N T A LThe experiments were carried out with Merino x Border Leicester lambs maintained on different dietary regimes, following random allocation, and infected with 0. columbianum. Seven ram lambs reared free from helminths were used. Three lambs were maintained on a ration consisting exclusively of lucerne chaff (the high plane-HP group), and the other four on a mixture of wheaten straw and molasses (the low plane-LP group). Both rations were available ad lib. An analysis of the major constituents was assessed according to methods of the Association of Official Agricultural Chemists (1960).

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The Probable Explanation for the Difference in the Localization of Adult Trichinella spiralis in Young and Old Mice

Cited by 29 publications

References 5 publications

Trichostrongylus vitrinus: The influence of age of sheep and population size on the intestinal distribution

Trichostrongylus vitrinus: The influence of age of sheep and population size on the intestinal distribution

Strongyloides ratti: 1. Parasitological observations on primary and secondary infections in the small intestine of rats

The effects of nematode parasitism on the rate of passage of food residues through the alimentary tract of sheep

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