Thyroid Condition of Chickens and Development of Parasitic Nematodes

Ac, Todd

doi:10.2307/3273300

Cited by 12 publications

(10 citation statements)

References 8 publications

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“…When the larval size was compared between the thyroxine-treated and normal groups of mice it was found that treatment with thyroxine had no effect on the growth of the larvae (t 0-11, P 0-9 in male mice; t 0, P 1-0 in female mice) ( Table 2). Todd (1949) and Whitlock (1949) suggested that alterations of the physiology of the thyroid because of pathological dietary and genetic reasons could contribute to the development of certain differences in the natural and innate immunities observed between individuals and strains of animals to some nematode infections. The bulk of the evidence on mild hypothyroidism and mild hyperthyroidism does not support this view, little effect on the host-relationship being noticed in animals suffering from these conditions (Larsh, 1947(Larsh, , 1950Todd, 1948Todd, , 1949Wheeler et al 1948); more severe treatment with thiouracil and thyroactive compounds have noticeable effects on the resistance of the host.…”

Section: (I) Numbers Of Worms Recoveredmentioning

confidence: 99%

“…fraterna, although the weight gains of the mice were affected; if he increased the dose of the thyroid extract the natural resistance of the old mice was lost. Todd (1948Todd ( , 1949 made a similar study with Ascaridia galli and Heterakis gallinae infections in mildly hypothyroid and hyperthyroid chickens and showed both conditions to have little effect on the resistance of the chicken, although changes in the growth of these worms were noted. Wheeler, Hoffmann & Barber (1948) found that mild hypothyroidism in chickens did not affect their survival when experimentally infected with coccidia.…”

Section: Introductionmentioning

confidence: 96%

“…These reports provide evidence which suggests that alterations of the physiology of the thyroid may result in changes in the host-parasite relationship. Todd (1949) also pointed out that natural variations in thyroid activity between heavy and light breeds of chicken may account for variations in their host-parasite relationship. The present investigations are a study of the effects of mild hypothyroidism and hyperthyroidism on the host-parasite relationship of Amplicaecum robertsi in mixed strain male and female mice.…”

Section: Introductionmentioning

confidence: 99%

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The effects of thiouracil and thyroxine on the host-parasite relationship of Amplicaecum robertsi Sprent & Mines, 1960, in the mouse

Dobson

1966

Parasitology

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When infected with equal numbers of eggs of Amplicaecum robertsi normal male mice harboured more larvae than normal females. Treatment of the mice with thiouracil and thyroxine eliminated the differences between the sizes of the worm populations shown between the sexes in normal mice.Thiouracil treatment increased the susceptibility of mice to A. robertsi infection, but caused a stunting of the larvae. Thyroxine treatment had no effect on the host–parasite relationship.It is suggested that the differential ability of the larvae to hatch, penetrate the tissues of the host and migrate to the liver in thiouracil- and thyroxine-treated mice was responsible for the differences in the sizes of the larval populations observed.This investigation was carried out during the tenure of a Senior Research Fellowship from the Wool Research Board of Australia. I should like to thank Professor J. F. A. Sprent for his continued interest and Mr C. Wilkinson for his careful assistance.

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Section: (I) Numbers Of Worms Recoveredmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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The effects of thiouracil and thyroxine on the host-parasite relationship of Amplicaecum robertsi Sprent & Mines, 1960, in the mouse

Dobson

1966

Parasitology

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“…(Madsen, 1952, p. 77). Todd (1949) infected small groups of chicks with Ascaridia galli, Heterakis gallinarwn and with both species. The various groups were fed a basal ration which in the experimental groups was supplemented with thyreoactive iodocasein (Protamone) or thiouracil, rendering the chicks mildly hyperthyroid and hypothyroid, respectively.…”

Section: Some Comparisons With Other Experimentsmentioning

confidence: 99%

On the Interaction between Heterakis gallinarum, Ascaridia galli, “Blackhead” and the Chicken

Madsen

1962

J. Helminthol.

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Measured dosages of larvated eggs of the caecal nematode, Heterakis gallinarum and the small intestinal nematode, Ascaridia galli were fed to domestic chickens, in order to study the distribution of the numbers of worms developing and the influence on the worms and the chicks of the treatments in the experiments. These treatments are summarised in Table 1, p. 110.Chronic respiratory disease, accidentally acquired by the groups of chicks in varying degrees appeared to have no influence on the course of the worm infections and the ensuing blackhead (Table 2, p. 112).Following ingestion of eggs of Heterakis, blackhead occurred in three of four groups of chicks, apparently in varying degrees, possibly related to the size of the egg dosage and to differences in susceptibility to Heterakis (Table 1, p. 110). The chicks inthe group which did not contract blackhead were considerably older than those of the other groups.

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“…is also experimental evidence that hormones may play a part in natural resistance (Stoll, 1936;Addis, 1946;Sadun, 1948;Todd, 1949).…”

mentioning

confidence: 99%

The Influence of an all Plant Protein Diet Supplemented with Aureomycin and Vitamin B12 on the Resistance of Chicks to Ascaridia galli (Schrank)

1953

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Thyroid Condition of Chickens and Development of Parasitic Nematodes

Cited by 12 publications

References 8 publications

The effects of thiouracil and thyroxine on the host-parasite relationship of Amplicaecum robertsi Sprent & Mines, 1960, in the mouse

The effects of thiouracil and thyroxine on the host-parasite relationship of Amplicaecum robertsi Sprent & Mines, 1960, in the mouse

On the Interaction between Heterakis gallinarum, Ascaridia galli, “Blackhead” and the Chicken

The Influence of an all Plant Protein Diet Supplemented with Aureomycin and Vitamin B12 on the Resistance of Chicks to Ascaridia galli (Schrank)

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