Trichostronglye worm infection in cattle: Further studies on problems of diagnosis and on seasonal patterns of occurrence

Rv, Brunsdon

doi:10.1080/00480169.1971.33966

Cited by 34 publications

(12 citation statements)

References 9 publications

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“…[6][7][8][9][10], correlation between plasma-pepsinogen levels and disease incidence was reasonable. No veterinarian mentioned using the test in older dry stock or cows.…”

Section: Diagnosismentioning

confidence: 83%

Ostertagiasis survey: summary and discussion

Chalmers

1980

New Zealand Veterinary Journal

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Opinions offered by 127 veterinary practitioners indicated that cattle ostertagiasis occurred throughout New Zealand; it was seen in all age-groups regularly in some regions; poorly fed animals were more susceptible to outbreaks accompanied by a gradual decline in health; both poor and well-fed cattle were subject to sudden outbreaks which were almost entirely associated with nutritional changes. Most cases were diagnosed by clinical signs. The prescription of multiple anthelmintic doses was the most common treatment.According to research data, winter and summer conditions reduced O. ostertagi numbers on pasture. Survival depended on a gradual accumulation of inhibited larvae before winter and a reduction after summer. Although clinical type II cases usually occurred in the winter and spring, it was theorised that subclinical production losses were more likely to occur in the autumn.Management was solely responsible for the level of pasture contamination and animal health. Similar O. ()stertagi burdens were recorded in heavy and light cattle, although the latter were more likely to succumb to disease. Changes in worm populations were demonstrated on a farm during a 3-year period. Changes in diagnostic and treatment procedures using plasmapepsinogen estimations and longeracting anthelmintics were discussed.

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“…[6][7][8][9][10], correlation between plasma-pepsinogen levels and disease incidence was reasonable. No veterinarian mentioned using the test in older dry stock or cows.…”

Section: Diagnosismentioning

confidence: 83%

Ostertagiasis survey: summary and discussion

Chalmers

1980

New Zealand Veterinary Journal

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“…The FECRT only measures effects on egg production by mature worms, and egg output does not correlate well with actual numbers of worms in cattle (Brunsdon 1969(Brunsdon , 1971Eysker and Ploeger 2000). In sheep, considerable variability in the results of FECRTs is reported by Miller et al (2006), who advise caution in interpreting FECR in the 90-95% range, and that even effi cacies ≥95% do not guarantee the absence of resistant parasites.…”

Section: Important Considerations For Anthelmintic Resistance Studiesmentioning

confidence: 89%

“…Insights into the dynamics of intestinal nematode infections of young cattle were provided by studies in the late 1960s and early 1970s (Brunsdon 1968(Brunsdon , 1969(Brunsdon , 1971(Brunsdon , 1972. These studies were conducted in the lower part of the North Island, and while it is not known how closely they refl ect patterns in other climatic and agro-pastoral regions of the country they are considered generally useful for wider application and inference.…”

Section: Important Considerations For Anthelmintic Resistance Studiesmentioning

confidence: 99%

Anthelmintic resistance and management of nematode parasites on beef cattle-rearing farms in the North Island of New Zealand

Jackson

Rhodes²,

Pomroy

et al. 2006

New Zealand Veterinary Journal

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It is clear that in practice anthelmintic resistance is a secondary consideration to obtaining productivity advantages from the use of anthelmintics in beef cattle. Farmers' opinions were divided on many issues and the overall impression was of confused and diverse thinking regarding the principles of the use of anthelmintics. The overall outlook regarding anthelmintic resistance in cattle is bleak unless the need for integrated and long-term research activities is acted upon soon.

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“…Several workers have used faecal egg counts to define the seasonal patterns of nematode infections in Queensland (Roberts 1951;Roberts et a1 1952;Riek et a1 1953;Durie 1962;Winks 1968) and similar data have been reported for Victoria and Western Australia (Roberts 1957a;Peterson 1957). However, egg counts have limited value as measures of adult worm numbers and they do not indicate the presence of immature forms (Roberts 1957b;Michel 1968;Brunsdon 1971). Apart from the reports of Peterson (1957) and Anderson (1968) This paper gives information on the occurrence of nematodes and their seasonal trends in young beef cattle grazed on the North Coast and Tableland regions of New South Wales.…”

Section: Introductionmentioning

confidence: 93%

Studies on Nematode Infections of Beef Cattle in New South Wales

Smeal¹,

Hotson²,

Mylrea³

et al. 1977

Aust Veterinary J

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The occurrence and seasonal trends of nematode parasite infections in beef cattle on the Tablelands and North Coast regions of New South Wales are described, based on worm counts from 627 spring-born steers slaughtered at 2-monthly intervals from 6 to 24 months of age. The predominant parasites were Ostertagia ostertagi, Trichostrongylus axei and Cooperia spp. Large burdens of adult Ostertagia were seen in 12-month-old animals in late winter and early spring, and later in 18- to 20-month-old cattle in the following late summer and autumn. These infections often resulted in outbreaks of clinical parasitism. Massive numbers of inhibited early fourth stage larvae (EL4) also accumulated in the yearlings during their first spring, reached peaks in mid-summer and then declined. The possibility of their resumption of development to mature worms in the late summer and autumn period is discussed. Adult T. axei showed a similar seasonal trend to Ostertagia and may have increased the severity of outbreaks of clinical disease. Cooperia populations of EL4 and adult worms were highest in weaners during winter, but lower numbers thereafter indicated a strong resistance to re-infection. In addition, Haemonchus placei occurred frequently on the North Coast both as EL4 and adults in cattle of all ages up to 20 months. Of the other cattle nematodes, Oesophagostomum radiatum and Trichuris spp occurred in low numbers, mainly in weaners. Bunstomum phlebotomum and H. contortus occurred sporadically on the North Coast and Tablelands respectively. Intestinal Trichostronglyus spp, Oesophagostomum venulosum and Dictyocaulus viviparus were seen occasionally and Nematodirus spp were not seen. There was a poor relationship between worm counts and faecal egg counts. Cooperia spp dominated the egg counts, while those for other genera were generally low and did not reflect the relative abundance or seasonal changes in worm numbers.

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Trichostronglye worm infection in cattle: Further studies on problems of diagnosis and on seasonal patterns of occurrence

Cited by 34 publications

References 9 publications

Ostertagiasis survey: summary and discussion

Ostertagiasis survey: summary and discussion

Anthelmintic resistance and management of nematode parasites on beef cattle-rearing farms in the North Island of New Zealand

Studies on Nematode Infections of Beef Cattle in New South Wales

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