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    Nematode control in suckler beef cattle over their first two grazing seasons using a targeted selective treatment approach

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    Author
    O'Shaughnessy, James
    Earley, Bernadette
    Mee, John F
    Doherty, Michael L.
    Crosson, Paul
    Barrett, Damien
    de Waal, Theo
    Keyword
    Anthelmintics
    Gastrointestinal nematodes
    Lungworm
    Suckler beef cattle
    Targeted selective treatments
    Date
    2015-06-18
    
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    URI
    http://hdl.handle.net/11019/887
    Citation
    James O’Shaughnessy, Bernadette Earley, John F. Mee, Michael L. Doherty, Paul Crosson, Damien Barrett and Theo de Waal. Nematode control in suckler beef cattle over their first two grazing seasons using a targeted selective treatment approach. Irish Veterinary Journal. 2015, 68(1):13
    Abstract
    Background With concerns over the development of anthelmintic resistance in cattle nematode populations, we must re-examine our approach to nematode control in cattle. Targeted selective treatments (TST), whereby individual animals are treated instead of entire groups, are being investigated as an alternative. The study objective was to determine if anthelmintic usage could be reduced using a TST-based approach to nematode control in spring-born suckler beef cattle over their first and second grazing seasons (SGS) without affecting performance. In the first grazing season (FGS), 99 calves with an initial mean (s.d.) calf age and live weight on day 0 (June 28th 2012) of 107 (23.1) days and 160 (32.5) kg, respectively, were used. The study commenced on day 0 when calves were randomised and allocated to one of two treatments; 1), standard treatment (control) and 2), TST. Control calves were treated subcutaneously with ivermectin on days 0, 41 and 82 in the FGS. All calves were treated with ivermectin on day 124 and housed on day 133. In the SGS, only heifer calves from the FGS were used and control heifers were treated with ivermectin on day 393. Animals were weighed, blood and faecal sampled every three weeks. The TST animals were treated with ivermectin if thresholds based on a combination of plasma pepsinogen concentrations, faecal egg count and/or the presence of Dictyocaulus viviparus larvae in faeces (FGS only) were reached. Results No TST calves reached the treatment threshold criteria in the FGS. The FGS average daily live weight gain (ADG ± s.e.m.) for control and TST group calves was 0.89 ± 0.02 kg and 0.94 ± 0.02 kg day−1, respectively (P = 0.17). In the SGS, all heifers were treated with ivermectin on day 431 due to clinical signs of respiratory disease. The ADG for control and TST heifers from turnout on day 321 to day 431 was 0.90 ± 0.04 and 0.80 ± 0.04 kg day−1, respectively (P = 0.03). Conclusions Spring-born FGS suckler beef calves require minimal anthelmintic treatment to maintain performance. In contrast, clinical parasitic disease may develop in the SGS unless appropriate anthelmintic treatment is provided.
    Funder
    Teagasc Walsh Fellowship Programme
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1186/s13620-015-0038-1
    Scopus Count
    Collections
    Livestock Systems
    Teagasc publications in Biomed Central
    Animal & Bioscience

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