Influence of sex and reproductive status on susceptibility of ruminants to nematode parasitism

Barger, I.A.

doi:10.1016/0020-7519(93)90034-v

Cited by 182 publications

(110 citation statements)

References 46 publications

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“…The relatively moderate egg production measured on the pasture during the third sampling period in the summer of 1992 after a very large quantity of infective larvae had been ingested, indicates the existence of a strong regulation of the worm population. The significant effects of sex and reproductive status were consistent with the usual results reported in the literature: the higher resistance of females than males, and a periparturient rise in egg output [3].…”

Section: Discussionsupporting

confidence: 90%

A short-term divergent selection for resistance to Teladorsagia circumcincta in Romanov sheep using natural or artificial challenge

et al. 2004

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-This experiment was conducted to assess the efficiency of selection on the basis of response to artificial challenges in order to breed sheep resistant to natural infection. A shortterm divergent selection process was designed to estimate the genetic parameters of these two traits. Two flocks, including 100 Romanov ram lambs each, were challenged in 1990 when they were 6 months old. One flock received three artificial infections with 20 000 third-stage Teladorsagia circumcincta larvae, at intervals of 7 weeks. Faecal egg counts (FEC) were performed on Days 22, 25 and 28 post infection (p.i.) and the animals were drenched on Day 28 p.i. The other flock was grazed for 5 months on a pasture contaminated with the same species. Faecal samples were taken from the lambs at similar ages. About 5 rams with the lowest FEC and 5 with the highest FEC were selected in each flock and mated with unselected ewes. Their offspring (200 animals) were challenged in 1992, half in the same way as their sires, and the other half by the other method. Because of a drought in the summer of 1990, it was necessary to repeat part of the experiment, and in 1992 the 5 and 8 rams with the lowest and highest FEC, respectively, were selected from the offspring challenged on the pasture in 1992 and were mated with unselected ewes. Their progeny (about 80 animals) were challenged in 1994, half by natural infection, half by artificial infection. The mean FEC of the flock increased from the first to the third artificial infection. The natural infection was highly variable in different years, reflecting the difficulty of assessing resistance using this mode of challenge. Genetic parameters were estimated using animal models and REML solutions. The repeatabilities of the FEC following * Corresponding author: gruner@tours.inra.fr * * Present address: 28 rue du Couvent, L-1363 Howald, Luxembourg * * * Present address: Inra, Unité de recherches zootechniques, 97170 Petit-Bourg, French West Indies 218 L. Gruner et al.artificial and natural infection were 0.49 and 0.70 respectively within a period of one week, and 0.22 and 0.41 respectively for periods separated by intervals of 7 weeks; the heritabilities of the single egg count were 0.22 and 0.38 respectively. The genetic correlation was 0.87: the FEC recorded under natural or artificial infection appear to depend on the same genetic potential.host resistance / sheep-nematoda / Teladorsagia circumcincta / genetic parameters

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Section: Discussionsupporting

confidence: 90%

A short-term divergent selection for resistance to Teladorsagia circumcincta in Romanov sheep using natural or artificial challenge

et al. 2004

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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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“…We fitted gender, starting weight, and a gene-specific combined effect of SNP TXNIP genotype (AA, AB) and infection (A. suum-infected, uninfected) as fixed effects (Barger 1993). Pig, litter of origin, pen, and necropsy day were fitted as random effects.…”

Section: Data Processing and Statistical Analysismentioning

confidence: 99%

Transcriptional immune response in mesenteric lymph nodes in pigs with different levels of resistance to Ascaris suum

Skallerup

Nejsum

Cirera

et al. 2017

Acta Parasitologica

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Influence of sex and reproductive status on susceptibility of ruminants to nematode parasitism

Cited by 182 publications

References 46 publications

A short-term divergent selection for resistance to Teladorsagia circumcincta in Romanov sheep using natural or artificial challenge

A short-term divergent selection for resistance to Teladorsagia circumcincta in Romanov sheep using natural or artificial challenge

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

Transcriptional immune response in mesenteric lymph nodes in pigs with different levels of resistance to Ascaris suum

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