Economic losses caused by the use of low-efficacy anthelmintic drugs in growing heifers.

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ID: 76061
2019
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Abstract
The aim of this study was to compare the economic revenue related to the use of low- or high-efficacy anthelmintic drugs within suppressive or strategic schemes of treatment in growing heifers. Heifers raised in a semi-intensive grazing system in southern Brazil were used. Levamisole and ivermectin were selected as the high- and the low-efficacy drugs, respectively, based on a previous efficacy test. Subsequently, these drugs were used within strategic (Strat; four times per year) or suppressive (Supp; once a month) treatment regimens in the heifers, and their liveweight and eggs per gram of feces counts were monthly evaluated during a 13-month period. The total costs of the treatments and their cost-benefit ratio in regard to liveweight gain were calculated. Final mean liveweight gains (kg) observed were 126.7 (Strat-Low), 133.6 (Supp-Low), 141.3 (Strat-High), 142.9 (Supp-High), and 125.8 (Control). Treatments with a high-efficacy drug resulted in monetary gains of US$ 19.56 (Strat-High) and US$ 14.98 (Supp-High), but Supp-Low and Strat-Low treatments caused economic losses. Total cost of the efficacy test (US$ 374.79) could be paid by the additional liveweight gain of 20 heifers from the Strat-High group. These results showed that it would be preferable not to treat the heifers against GIN if compared with treating them with a low-efficacy drug. In addition, we showed that the use of four treatments per year with a high-efficacy drug-selected by efficacy test-resulted in a profitable management to control GIN in growing heifers raised in a semi-intensive gazing system in southern Brazil.
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pivoto2019economictropical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Felipe Lamberti Pivoto, Alfredo Skrebsky Cezar, Fernanda Silveira Flores Vogel, Camila Balconi Marques, Marta Elena Machado Alves, Camila Coelho Becker, Marta Lizandra do Rego Leal
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Journal Tropical animal health and production
Year 2019
DOI
10.1007/s11250-019-02144-1
URL
Keywords
nematodes cattle economic weight gain parasite resistance

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