Resistance of exotic and domestic lambs to experimental infection with Haemonchus contortus

Courtney, Charles H.; Parker, Cathy; McClure, K. E.; Herd, R.P.

doi:10.1016/0020-7519(85)90107-9

Cited by 81 publications

(44 citation statements)

References 24 publications

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“…Nas raças ovinas que apresentam maior resistência aos nematódeos, o fenômeno do periparto, quando ocorre, é mais discreto do que o observado em raças ovinas susceptíveis (Donald et al, 1982;Courtney et al, 1984;Wanyangu et al, 1997;Amarante et al, 1999b;Rocha et al, 2004a).…”

Section: Período Do Peripartounclassified

Os parasitas de ovinos

Amarante¹,

Ragozo²,

Silva³

2014

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Section: Período Do Peripartounclassified

Os parasitas de ovinos

Amarante¹,

Ragozo²,

Silva³

2014

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“…The phenomenon was more marked in experiment 3 which was a replication of experiment 2. In experiment 5, the same trend was observed (figure 2), but the difference between the 2 groups was not significant ( (Blum and Cioli, 1978;Deelder et al, 1978;Perrudet-Badoux et al, 1978;Wakelin, 1978 (Evans et al, 1963;Jilek and Bradley, 1969;Radhakrishnan et al, 1972;Allonby and Urquhart, 1976;Dargie, 1976, 1978a, b;Preston and Allonby, 1979;Dally et al, 1980;Luffau et al, 1981a, b;Courtney et al, 1985), but they are in keeping with the results of Le Jambre (1978), R,iffkin and Dobson (1979), Courtney et al (1984), Riffkin and Yong (1984) Evans and Whitlock (1964), Radhakrishnan et al (1972), Dargie (1976, 1978a, b) and Albers and Burgess reported by Piper (1987). The post-infection differences observed between animals of various haemoglobin genotypes might simply be due to differences existing in non-infected animals (Agar et al, 1972).…”

Section: Effect Of Anthelmintic Treatment On Immunity To the Parasitementioning

confidence: 50%

“…Several studies suggest that haemoglobin A allele provides a higher resistance to H contortus than the haemoglobin B allele (Evans et al, 1963;Jilek and Bradley, 1969;Radhakrishnan et al, 1972;Allonby and TJrquhart, 1976;Dargie, 1976, 1978a, b;Preston and Allonby, 1979;Dally et al, 1980;Luffau et al, 1981a, b;Courtney et al, 1985). According to Cuperlovic et al (1978), this enhanced resistance might be related to a higher humoral immune response.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have shown that females develop stronger immunity against H contortus than males (Colglazier et al, 1968;Yazwinski et al, 1980;Luffau et al, 1981a;Courtney et al, 1985;Watson, 1986) (Nguyen and Bunch, 1980). Class I antigens of the major histocompatibility system were tested by the microcytotoxicity method on blood lymphocytes; the test was carried out over a period of 2h 30 min (Cullen et al, 1985).…”

Section: Animalsmentioning

confidence: 99%

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Resistance to experimental infections with Haemonchus contortus in Romanov sheep

Luffau¹,

Khang²,

Bouix³

et al. 1990

Genet Sel Evol

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Summary -Responses to immunization with aggregated human serum albumin (HSA) and to repeated experimental infections with H contortus were studied in 51 female lambs of the Romanov breed, born from 8 sires and 36 dams. The 8 sires were of haemoglobin genotype Hb AB; the 51 lambs were distributed into 3 groups of 17 each, corresponding to the 3 genotypes HbAA, HbAB and HbBB. In addition the experimental lambs were typed for antigens of the major histocompatibility system (OL./1). The

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“…*P < 0.05; **P < 0.01; ***P < 0.001. as well as sex of lambs had no effect on any of the parasitological parameters (Table 4). Many studies have reported that male sheep are more susceptible than females to natural or experimental nematode infections around or after the age of puberty (Courtney et al, 1985;Barger, 1993).…”

Section: Resultsmentioning

confidence: 99%

Is the establishment rate and fecundity of Haemonchus contortus related to body or abomasal measurements in sheep?

Idris

Moors

Budnick

et al. 2011

Animal

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The relationship among parasitological parameters, abomasal size and body size measurements was investigated in lambs following an experimental infection with Haemonchus contortus. In total, 100 lambs from five different genotypes (German Merino (GM), Texel 3 GM, Suffolk 3 GM, German Blackhead Mutton 3 GM and Ile de France 3 GM) were experimentally infected with 5000 infective third stage larvae of H. contortus at the time of weaning at 12 weeks of age. Four and six weeks after infection, individual faecal samples were collected for estimation of faecal egg counts (FECs). Furthermore, wither height, shoulder width, heart girth, loin girth and body length were taken at 18 weeks of life. Lambs were slaughtered and necropsied 7 weeks post-infection, and worm counts, abomasal volume and surface area were determined. Positive correlations were found between different body size parameters, body weight and abomasal sizes. FEC and worm counts were not significantly correlated either with body size parameters or with abomasal size. The mean worm burden was higher in GM than in crossbred lambs. There was no significant difference in abomasal size between GM and crossbred lambs. The results suggest that the variations between animals in worm burden following an experimental infection with H. contortus (worm resistance) are not influenced by body size parameters or abomasal sizes. Therefore, other factors, including genetic-based differences in resistance, must cause these findings between and within breeds.

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Resistance of exotic and domestic lambs to experimental infection with Haemonchus contortus

Cited by 81 publications

References 24 publications

Os parasitas de ovinos

Os parasitas de ovinos

Resistance to experimental infections with Haemonchus contortus in Romanov sheep

Is the establishment rate and fecundity of Haemonchus contortus related to body or abomasal measurements in sheep?

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