Occurrence of Goitre in Summer Born Lambs of Different Breeds

George, JM; Farleigh, E. A.; Harris, A. N. A.

doi:10.1111/j.1751-0813.1966.tb04600.x

Cited by 10 publications

(4 citation statements)

References 13 publications

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“…In New South Wales goitre has been reported in lambs from the districts of Crookwell (Setchell et al 1960), Armidale and Glen Innes (George et al 1966) and Monaro (Anon. 1970).…”

Section: Discussionmentioning

confidence: 99%

“…Apart from low iodine intake due to low iodine content of pastures, low plasma thyroxine values could also arise from the presence of goitrogens in particular pasture species, e.g. white clover (George et al 1966). However, to date there is no unequivocal evidence that pasture goitrogens are a primary cause of endemic goitre (Trikojus 1974).…”

Section: Discussionmentioning

confidence: 99%

“…Some of the variation between States could be due to different susceptibilities of different breeds to goitre. No information is available on this point apart from the report of George et al (1966) who showed different incidences of goitre in Dorset Hom and Merino sheep.…”

Section: Discussionmentioning

confidence: 99%

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Plasma Thyroxine Concentrations in Grazing Sheep in Several Areas of Australia

Wallace¹,

Gleeson²,

Ps³

et al. 1978

Aust. Jnl. Of Bio. Sci.

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Plasma thyroxine concentrations were measured by radioimmunoassay in plasma samples from 691 lactating ewes in 26 areas of New South Wales, Queensland, Western Australia and Tasmania. Sheep sampled in New South Wales and Tasmania had significantly lower plasma thyroxine values (4.0 and 4.3 microgram/100 ml respectively) than those sampled in Queensland and Western Australia (5.4 and 5.3 microgram/100 ml respectively). However, sheep in some districts in southern Queensland also had low plasma thyroxine values. The areas where sheep had low plasma thyroxine values correlate well with areas where goitre has been previously reported, both in man and in domestic animals. This suggests that measurement of plasma thyroxine is probably a valid empirical method of assessing the relative iodine deficiency of grazing sheep and further that sheep grazing substantial areas of New South Wales, Tasmania and to a lesser extent Queensland may have thyroid dysfunction of varying degrees of severity. These findings could have implications for animal production in these areas.

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“…In New South Wales goitre has been reported in lambs from the districts of Crookwell (Setchell et al 1960), Armidale and Glen Innes (George et al 1966) and Monaro (Anon. 1970).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Plasma Thyroxine Concentrations in Grazing Sheep in Several Areas of Australia

Wallace¹,

Gleeson²,

Ps³

et al. 1978

Aust. Jnl. Of Bio. Sci.

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“…George, Farleigh and Harris (1966) reported that the incidence of goitre in Dorset-Horn lambs (50%) was greater than in crossbreds (44%) or Merinos (21%). However, the three flocks were not grazed together, so iodine intakes may have differed.…”

Section: Trapping Defectmentioning

confidence: 97%

Congenital goitre in sheep in southern Tasmania

Statham¹,

Bray²

1975

Aust. J. Agric. Res.

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Congenital goitre was first recorded in Tasmanian sheep In 1945. Severe but sporadic outbreaks have since occurred in 1956, 1964 and 1968. The disease seemed to be associated with particular farms and its incidence often differed markedly between ewe flocks on the one farm. A survey indicated that the condition was mainly confined to the Derwent Valley and the northern Midlands. Studies involved a grazing trial near Bothwell, where goitre was endemic, and included supporting animal house tnals and plant growth studies. Soil type was shown to be a major factor in the disease: ewes grazing pasture on a sandy soil produced many more goitrous lambs than ewes grazing pasture on clay soil. Analyses of the two pastures revealed that those on sandy so11 contained less iodine than those on clay soil but neither contained the minimum level necessary to prevent goitre. Observations revealed that outbreaks of the disease followed wet autumns with subsequent lush pasture during pregnancy. This correlation could be explained if pasture grown under moist conditions contained less iodine than pasture grown under moisture stress. However, experiments with the two main pasture species (perennial ryegrass and subterranean clover) showed that plant iodine levels were not affected by the water supply. Two goitrogenic agents, nitrate and thiocyanate, were present in the pastures, but they were not considered to be Important in the aetiology of the disease. Similarly, the drinking water was found to be unimportant, even though the two sources available contained widely different amounts of iodine. Apparently, between-year variation in the incidence of goitre and the effect of soil type can best be explained by a varying iodine intake dependent on soil ingestion which varies with pasture availability. This hypothesis is discussed in the light of the results.

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