Comparison of three methods for gastrointestinal nematode diagnosis determination in grazing dairy cattle in relation to milk production

Mejía, Miguel E.; Perri, A.F.; Licoff, N.; Miglierina, M M; Cseh, S.; Ornstein, Ana María; Becú-Villalobos, Damasia; Lacau-Mengido, I.M.

doi:10.1016/j.vetpar.2011.06.027

Cited by 13 publications

(6 citation statements)

References 18 publications

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“…This must be rectified if future control strategies are to be economically sensible and well integrated into farming systems. Recent advances in diagnostics, such as quantification of bulk milk anti-nematode antibodies, have enabled improved estimates of the production impacts of parasites in dairy herds and underpin optimized strategies for their control [10][11][12]. Further gains in understanding are likely to be made by comparing animal production in high and low intervention situations [13] and where anthelmintic efficacy fails.…”

Section: Costs To Economies and Animalsmentioning

confidence: 99%

Global Change and Helminth Infections in Grazing Ruminants in Europe: Impacts, Trends and Sustainable Solutions

et al. 2013

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Infections with parasitic helminths (nematodes and trematodes) represent a significant economic and welfare burden to the global ruminant livestock industry. The increasing prevalence of anthelmintic resistance means that current control programmes are costly and unsustainable in the long term. Recent changes in the epidemiology, seasonality and geographic distribution of helminth infections have been attributed to climate change. However, other changes in environment (e.g., land use) and in livestock farming, such as intensification and altered management practices, will also have an impact on helminth infections. Sustainable control of helminth infections in a changing world requires detailed knowledge of these interactions. In particular, there is a need to devise new, sustainable strategies for the effective control of ruminant helminthoses in the face of global change. In this paper, we consider the impact of helminth infections in grazing ruminants, taking a European perspective, and identify scientific and applied priorities to mitigate these impacts. These include the development and deployment of efficient, high-throughput diagnostic tests to support targeted intervention, modelling of geographic and seasonal trends in infection, more thorough economic data and analysis of the impact of helminth infections and greater translation and involvement of end-users in devising and disseminating best practices. Complex changes in helminth epidemiology will require innovative solutions. By developing and using new technologies and models, the use of anthelmintics can be optimised to limit the development and spread of drug resistance and to reduce the overall economic impact of helminth infections. This will be essential to the continued productivity and profitability of livestock farming in Europe and its contribution to regional and global food security

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Section: Costs To Economies and Animalsmentioning

confidence: 99%

Global Change and Helminth Infections in Grazing Ruminants in Europe: Impacts, Trends and Sustainable Solutions

et al. 2013

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“…The following measurement techniques were used: individual cow ODR, faecal egg count (FEC) and plasma pepsinogen. Cows separated by positive or negative FECs (10epg sensitivity) showed a large difference in milk production whilst the other measures did not [3].…”

Section: Introductionmentioning

confidence: 97%

“…Previous authors have investigated the use of bulk milk assessment of Anti-O. ostertagi antibody optical density ratio (ODR) as a means to indicate the potential milk yield loss from Ostertagiosis in dairy herds [1]- [3]. Research competed in Europe has illustrated that higher ODR vat readings are associated with herds that have spent more time grazing [4].…”

Section: Introductionmentioning

confidence: 99%

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Faecal egg counts and bulk milk Anti-O. ostertagi antibody testing in pasture based dairy cattle of Victoria, Australia

Loughnan

Beggs

2022

Preprint

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Background:International research has suggested that anti Ostertagia ostertagi antibody optical density ratio (ODR) of vat milk can indicate the level of milk production benefit producers will get from applying effective anthelmintic treatments to lactating dairy cows. ODR is an indirect antibody ELISA assessment of the magnitude of antibody production specific to O. ostertagi. In Australian pastoral dairy systems, the worm challenge season can be prolonged with high rainfall temperate climates where lactating cattle and young stock are grazing year-round. The objective of this study was to look for a correlation between ODR and faecal egg count (FEC) or the presence of parasite eggs in faeces in corresponding cohorts.Methods:Fourteen commercial dairy herds in south-west Victoria (Australia) were sampled in the study. Faecal samples were collected from recently calved cows (less than 30 days in milk) for individual FEC (sensitive to 2.5 eggs per gram of faeces) Fifteen primiparous and 15 multiparous animals of representative ages were sampled. On the same day, milk vat samples were collected during the calving period for ODR. Farm management practices including recent and routine anthelmintic use was recorded for each property and each cohort of animals.Results:Bulk milk ODR was not related to measurable FEC in corresponding herds. Bulk milk ODR was also not related to the proportion of animals in each corresponding cohort with detected parasite eggs in faeces. Bulk milk ODR was strongly correlated with days since most recent anthelmintic application (r2=0.73).Conclusion:Anti-O. ostertagi ODR is a good measure of likely antibody presence against O. ostertagi. However, in pastoral systems in Australia where worms are present on pasture for sustained periods, possibly year-round, it may not be a good measure of current parasite load. ODR should not be used as the sole determinant of anthelmintic application in Victorian pastoral dairy herds.

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“…goat, sheep) production worldwide. Economic losses are caused by decreased production, cost of prevention, cost of treatment, and ultimately through the death of infected animals (Barger, 1982;Donald et al, 1982;Perri et al, 2011;Mejla et al 2011;Cringoli et al, 2004;Mes, 2003;Longo Ribeiro Vilela et al 2012). The control of GI parasites traditionally relies on grazing management , anthelmintic treatment (Costa et al, 2006) or both.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations of EPG Levels in gastro-intestinal parasitic infection in a southeast asian controlled locale: a statistical analysis

Chattopadhyay

Bandyopadhyay

2013

SpringerPlus

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We present a data based statistical study on the effects of seasonal variations in the growth rates of the gastro-intestinal (GI) parasitic infection in livestock. The alluded growth rate is estimated through the variation in the number of eggs per gram (EPG) of faeces in animals. In accordance with earlier studies, our analysis too shows that rainfall is the dominant variable in determining EPG infection rates compared to other macro-parameters like temperature and humidity. Our statistical analysis clearly indicates an oscillatory dependence of EPG levels on rainfall fluctuations. Monsoon recorded the highest infection with a comparative increase of at least 2.5 times compared to the next most infected period (summer). A least square fit of the EPG versus rainfall data indicates an approach towards a super diffusive (i. e. root mean square displacement growing faster than the square root of the elapsed time as obtained for simple diffusion) infection growth pattern regime for low rainfall regimes (technically defined as zeroth level dependence) that gets remarkably augmented for large rainfall zones. Our analysis further indicates that for low fluctuations in temperature (true on the bulk data), EPG level saturates beyond a critical value of the rainfall, a threshold that is expected to indicate the onset of the nonlinear regime. The probability density functions (PDFs) of the EPG data show oscillatory behavior in the large rainfall regime (greater than 500 mm), the frequency of oscillation, once again, being determined by the ambient wetness (rainfall, and humidity). Data recorded over three pilot projects spanning three measures of rainfall and humidity bear testimony to the universality of this statistical argument.

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Comparison of three methods for gastrointestinal nematode diagnosis determination in grazing dairy cattle in relation to milk production

Cited by 13 publications

References 18 publications

Global Change and Helminth Infections in Grazing Ruminants in Europe: Impacts, Trends and Sustainable Solutions

Global Change and Helminth Infections in Grazing Ruminants in Europe: Impacts, Trends and Sustainable Solutions

Faecal egg counts and bulk milk Anti-O. ostertagi antibody testing in pasture based dairy cattle of Victoria, Australia

Seasonal variations of EPG Levels in gastro-intestinal parasitic infection in a southeast asian controlled locale: a statistical analysis

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