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Determining the Prevalence and Seasonality of Fasciola hepatica in Pasture-based Dairy herds in Ireland using a Bulk Tank Milk ELISA.

Bloemhoff Y, Forbes A, Danaher M, Good B, Morgan E, Mulcahy G, Sekiya M, Sayers R - Ir Vet J (2015)

Bottom Line: A within-herd prevalence of ≤ 50 % was found for herds with negative bulk tank milk samples.The seasonal pattern of F. hepatica shows elevated antibodies as the grazing season progressed, reaching a peak in January.A significant association was found between F. hepatica and age at first calving.

View Article: PubMed Central - PubMed

Affiliation: Animal and Bioscience Research Department, Animal & Grassland Research and Innovation Centre, Teagasc, Moorepark, Fermoy, Co. Cork, Republic of Ireland.

ABSTRACT

Background: Fasciola hepatica is a helminth parasite of global importance in livestock, with major economic impact. However information on F. hepatica infections in Irish pasture-based dairy herds is limited. Therefore this study was conducted in order to determine the prevalence, seasonality and management factors associated with F. hepatica. A total of 319 Irish dairy herds were selected for this study. Bulk tank milk (BTM) samples were collected from 290 dairy farms on a quarter year basis, while from a further 29 dairy farms BTM samples were collected on a monthly basis to provide a more detailed pattern of F. hepatica exposure in Irish herds. BTM samples were analysed using a commercially available F. hepatica antibody detection ELISA. Furthermore, within-herd prevalence of F. hepatica was assessed in a subset of these 29 herds (n = 17); both individual serum samples and bulk tank milk samples were collected.

Results: A within-herd prevalence of ≤ 50 % was found for herds with negative bulk tank milk samples. The mean prevalence of the 290 study herds was 75.4 % (Range 52 %-75.1 %), with the highest prevalence being observed in November (75.1 %). The seasonal pattern of F. hepatica shows elevated antibodies as the grazing season progressed, reaching a peak in January. A significant association was found between F. hepatica and age at first calving.

Conclusion: This study demonstrates that F. hepatica is present in a large proportion of Irish dairy herds and provides a basis on which control practices, particularly in adult dairy cows, can be reviewed.

No MeSH data available.


Related in: MedlinePlus

Within each month HerdAhead herds (n = 277) are categorised based on S/P value into low positive, moderate positive and high positive S/P herds
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Fig4: Within each month HerdAhead herds (n = 277) are categorised based on S/P value into low positive, moderate positive and high positive S/P herds

Mentions: Results on prevalence from the ‘HerdAhead herds (n = 277) are shown in Table 2 and Fig. 4 respectively. 12 farms were omitted from the study because of missing data. Positive herds were characterized as low (15–25 S/P), moderate (25–75 S/P), and highly (>75 S/P) positive for F. hepatica. A total of 75.4 % of the ‘HerdAhead’ herds recorded one or more positive F. hepatica BTM results across the four sampling dates. The November sampling point recorded the highest proportion of positive ‘HerdAhead’ herds and herds with a BTM status of ‘High positive’. Multivariable analysis revealed similar results to the prevalence data (Table 4). Herds were more likely to be positive in November compared to March (OR = 2.74), June (OR = 2.62) and August (OR = 1.80), while herds in August were more likely to be positive to F. hepatica compared to March (OR = 1.53) and June (OR = 1.46).Fig. 4


Determining the Prevalence and Seasonality of Fasciola hepatica in Pasture-based Dairy herds in Ireland using a Bulk Tank Milk ELISA.

Bloemhoff Y, Forbes A, Danaher M, Good B, Morgan E, Mulcahy G, Sekiya M, Sayers R - Ir Vet J (2015)

Within each month HerdAhead herds (n = 277) are categorised based on S/P value into low positive, moderate positive and high positive S/P herds
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4495626&req=5

Fig4: Within each month HerdAhead herds (n = 277) are categorised based on S/P value into low positive, moderate positive and high positive S/P herds
Mentions: Results on prevalence from the ‘HerdAhead herds (n = 277) are shown in Table 2 and Fig. 4 respectively. 12 farms were omitted from the study because of missing data. Positive herds were characterized as low (15–25 S/P), moderate (25–75 S/P), and highly (>75 S/P) positive for F. hepatica. A total of 75.4 % of the ‘HerdAhead’ herds recorded one or more positive F. hepatica BTM results across the four sampling dates. The November sampling point recorded the highest proportion of positive ‘HerdAhead’ herds and herds with a BTM status of ‘High positive’. Multivariable analysis revealed similar results to the prevalence data (Table 4). Herds were more likely to be positive in November compared to March (OR = 2.74), June (OR = 2.62) and August (OR = 1.80), while herds in August were more likely to be positive to F. hepatica compared to March (OR = 1.53) and June (OR = 1.46).Fig. 4

Bottom Line: A within-herd prevalence of ≤ 50 % was found for herds with negative bulk tank milk samples.The seasonal pattern of F. hepatica shows elevated antibodies as the grazing season progressed, reaching a peak in January.A significant association was found between F. hepatica and age at first calving.

View Article: PubMed Central - PubMed

Affiliation: Animal and Bioscience Research Department, Animal & Grassland Research and Innovation Centre, Teagasc, Moorepark, Fermoy, Co. Cork, Republic of Ireland.

ABSTRACT

Background: Fasciola hepatica is a helminth parasite of global importance in livestock, with major economic impact. However information on F. hepatica infections in Irish pasture-based dairy herds is limited. Therefore this study was conducted in order to determine the prevalence, seasonality and management factors associated with F. hepatica. A total of 319 Irish dairy herds were selected for this study. Bulk tank milk (BTM) samples were collected from 290 dairy farms on a quarter year basis, while from a further 29 dairy farms BTM samples were collected on a monthly basis to provide a more detailed pattern of F. hepatica exposure in Irish herds. BTM samples were analysed using a commercially available F. hepatica antibody detection ELISA. Furthermore, within-herd prevalence of F. hepatica was assessed in a subset of these 29 herds (n = 17); both individual serum samples and bulk tank milk samples were collected.

Results: A within-herd prevalence of ≤ 50 % was found for herds with negative bulk tank milk samples. The mean prevalence of the 290 study herds was 75.4 % (Range 52 %-75.1 %), with the highest prevalence being observed in November (75.1 %). The seasonal pattern of F. hepatica shows elevated antibodies as the grazing season progressed, reaching a peak in January. A significant association was found between F. hepatica and age at first calving.

Conclusion: This study demonstrates that F. hepatica is present in a large proportion of Irish dairy herds and provides a basis on which control practices, particularly in adult dairy cows, can be reviewed.

No MeSH data available.


Related in: MedlinePlus