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- W2078476239 abstract "Anthelmintic effects of plant secondary compounds may be occurring in the rumen, but in vitro larvae migration inhibition (LMI) methods using rumen fluid and forage material have not been widely used. Forage material added to an in vitro system can affect rumen pH, ammonia N, and volatile fatty acids, which may affect larvae viability (LV). Validating a LMI assay using rumen fluid and a known anthelmintic drug (Ivermectin) and a known anthelmintic plant extract ( Quebracho tannins ; QT) is important. Rumen fluid was collected and pooled from 3 goats, mixed with buffer solution and a treatment (1 jar/treatment), and placed into an anaerobic incubator for 16 h. Ensheathed larvae (<3 months old) were then anaerobically incubated with treatment rumen fluid for 2, 4, or 16 h depending on the trial. Larvae ( n = 15–45) were then transferred onto a screen ( n = 4–6 wells/treatment) within a multi-screen 96-well plate that contained treatment rumen fluid. Larvae were incubated overnight and those that passed through the 20-μm screen were considered viable. Adding dry or fresh juniper material reduced ( P < 0.05) pH, ammonia N, and isobutyric, butyric, isovaleric, and valeric acids, and increased ( P < 0.001) acetic, propionic, and total VFA. Including 4.5% (w/v) polyethylene glycol (PEG) in rumen fluid mixture with or without forage material reduced ( P < 0.01) LV. However, LV was similar at all PEG concentrations tested (0–2%, w/v; 89.4, 78.9, 76.5, 75.5, and 77.5% viable). Q. tannin concentrations from 0 to 1.2% (w/v) quadratically reduced ( P < 0.001) LV; 89.4, 65.5, 22.8, and 9.2%. Ivermectin concentrations from 0 to 15 μg/mL quadratically reduced ( P < 0.001) LV; 90.2, 82.6, 73.6, 66.3, 51.9, 56.5, 43.5, 41.9, 29.3, and 19.9% viable, respectively. Effects of altering in vitro rumen fluid pH, ammonia N, and VFA and using PEG when evaluating LV need to be further investigated. In vitro rumen fluid assays using QT and Ivermectin resulted in decreased LV, validating the efficacy of this technique for measuring Haemonchus contortus larval viability." @default.
- W2078476239 created "2016-06-24" @default.
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- W2078476239 date "2011-03-01" @default.
- W2078476239 modified "2023-09-27" @default.
- W2078476239 title "A modified in vitro larvae migration inhibition assay using rumen fluid to evaluate Haemonchus contortus viability" @default.
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- W2078476239 doi "https://doi.org/10.1016/j.vetpar.2010.10.050" @default.
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