Nematode parasitism in adult dairy cows in Belgium

Agneessens, Joost; Claerebout, Edwin; Dorny, Pierre; Borgsteede, F.H.M.; Vercruysse, Jozef

doi:10.1016/s0304-4017(00)00232-6

Cited by 83 publications

(34 citation statements)

References 22 publications

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“…A 12-month sample of digestive tracts from adult dairy cows processed through a Belgian abattoir after a pre-slaughter grazing period showed a close relationship between antibodies to adult Cooperia and Ostertagia species (reported as r 2 = 0.52 (r = 0.72) Agneessens et al 2000). Results in the present study were quite similar, with a correlation of 0.70 among herd means for adult Cooperia and Ostertagia species.…”

Section: Herd Meanssupporting

confidence: 78%

Sire effects on antibodies to nematode parasites in grazing dairy cows

Morris

Cullen

Green

et al. 2002

New Zealand Journal of Agricultural Research

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A study was carried out on New Zealand dairy cows at pasture, to test for evidence of genetic differences in immunological response to nematode parasites. Nine widely used HolsteinFriesian artificial insemination bulls, with daughters in many herds, were evaluated for nematode antibodies by sampling milk of their daughters in mid lactation in each of 20 North Island herds. One milk sample was taken from each cow (ranging from 4 to 11 years of age), during a routine herd test in the period from mid November 2000 to early February 2001. Assays were undertaken subsequently on pooled samples of skim milk (0.2 ml per cow; up to 20 cows per sire x herd) to assess antibodies to both the infective third larval (L3) and adult parasitic stages of Cooperia oncophora and Ostertagia ostertagi. Sire effects were significant for all four antibody types (P < 0.001). anti-parasite antibody levels were present in mature lactating dairy cows at pasture in New Zealand, with repeatabilities of sire means across herds of 0.29-0.39, and that sire effects on antibody levels to two different nematode parasite species were highly correlated (for antibodies to either the L3 or the adult stages).

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Section: Herd Meanssupporting

confidence: 78%

Sire effects on antibodies to nematode parasites in grazing dairy cows

Morris

Cullen

Green

et al. 2002

New Zealand Journal of Agricultural Research

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“…Such a pattern is known to occur in the Ostertagia-specific serum antibody level of pastured dairy cows (Agneesssens et al, 2000;Borgsteede et al, 2000) and follows the expected intake of infectious larvae. The antibody levels increase during the pasture season and decrease during the housing period, when most larvae are present in the form of inhibited L4 stages.…”

Section: Discussionmentioning

confidence: 99%

“…An obvious seasonal pattern in the Ostertagia-specific serum antibody level has been described (e.g. Agneesssens et al, 2000;Borgsteede et al, 2000). Seasonal differences could also occur in the Ostertagia-specific milk antibody level and affect the interpretation of the test results.…”

Section: Introductionmentioning

confidence: 99%

A longitudinal survey of anti-Ostertagia ostertagi antibody levels in individual and bulk tank milk in two dairy herds in Normandy

Charlier

Camuset²,

Claerebout

et al. 2007

Research in Veterinary Science

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The Ostertagia-specific antibody levels in milk were monitored in 2 dairy herds to investigate seasonal variations and the relationship between individual and bulk tank milk antibody levels. Bulk tank and individual milk samples from all lactating animals were collected over a 1-year period at weekly and monthly intervals, respectively. The Ostertagia-specific antibody levels were measured with an indirect ELISA and the test results were expressed as optical density ratios (ODR). A clear seasonal pattern that followed the expected intake of infectious larvae was observed in the individual and bulk tank milk antibody levels of both herds. Within each herd, there was a large variation in the individual ODRs. This variation remained large when the distribution of individual ODRs was plotted according to high and low bulk tank milk ODR categories. The results suggest that the effect of seasonal variations on cut-off levels that predict production responses after anthelmintic control, needs to be assessed.

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“…Fecal egg counts have traditionally been utilized to identify and quantify infections, however, this test is plagued with false negatives, high variability between consecutive tests (low repeatability), and overall underestimation of the level of infection (Gross et al, 1999;Agneessens et al, 2000;Borgsteede et al, 2000;Eysker and Ploeger, 2000). Serum pepsinogen tests have had some success with quantifying levels of parasitism in first-season grazers, but were less reliable when used to quantify infections in adult cattle (Gross et al, 1999;Agneessens et al, 2000;Borgsteede et al, 2000). Unfortunately, the accuracy of the pepsinogen test depends on the current life cycle stages of the nematodes in the host (Berghen et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Predicting the effect of anthelmintic treatment on milk production of dairy cattle in Canada using an Ostertagia ostertagi ELISA from individual milk samples

Vanderstichel

Dohoo

Sánchez

et al. 2013

Preventive Veterinary Medicine

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Gastrointestinal nematodes, such as Ostertagia ostertagi and several species of Cooperia, are ubiquitous in temperate climates and have been shown to have detrimental effects on production in adult dairy cattle. A published meta-analysis demonstrated that overall, producers lose approximately 0.35 kg of milk per parasitized cow per day. Enzyme-linked immunosorbent assays (ELISAs) have the ability to quantify nematode infections in cattle, and thus, could be used to estimate the amount of milk production loss due to differing levels of parasitism at the individual cow level. 2ELISA results from individual cow milk samples were used to predict milk production response following a randomized anthelmintic treatment in a large field trial. To increase statistical power, the data collected from this field trial was pooled with data from two other published field trials to form an individual patient data meta-analysis (IPDMA).The ability to predict the effect of anthelmintic treatment on milk production depends on the level of parasitism quantified by an ELISA measuring milk antibodies against Ostertagia ostertagi, and reported as optical density ratios (ODRs). Therefore, the estimates from the interaction between ODR and treatment on milk production were used to determine how well the ODR predicted the response of the treatment. It was anticipated that the relationship between milk production and ODR was unlikely to be linear, so fractional polynomials were applied to the continuous ODR values.The interaction in the field trial showed a trend (p=0.138) towards a beneficial treatment effect when the individual ODR values, measured in late lactation and using Svanovir®, were greater than 0.12. When individual data from two other similar studies were included in an IPDMA, the interaction terms became statistically significant (p=0.009) indicating that there is a beneficial treatment effect when ODR values are slightly elevated. A graph was used to demonstrate the treatment effect (the estimated difference of kg/cow/day of milk yield between the treated and placebo cows), with 95% confidence intervals, as the ODR values increase. It is important to note that the methods of quantifying the ODR values differed between the three studies in the IPDMA, therefore some caution should be used when using these final estimated values. However, the shape and magnitude of the treatment 3 effects, as well as the other fixed model estimates, were very similar between the field trial and the IPDMA suggesting that any bias would likely be minimal.

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Nematode parasitism in adult dairy cows in Belgium

Cited by 83 publications

References 22 publications

Sire effects on antibodies to nematode parasites in grazing dairy cows

Sire effects on antibodies to nematode parasites in grazing dairy cows

A longitudinal survey of anti-Ostertagia ostertagi antibody levels in individual and bulk tank milk in two dairy herds in Normandy

Predicting the effect of anthelmintic treatment on milk production of dairy cattle in Canada using an Ostertagia ostertagi ELISA from individual milk samples

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