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- Title
Effectiveness of Fenbendazole in growing Quarter Horses using the Quantitative Modified Wisconsin Technique.
- Authors
Lavergne, Jamie; Leatherwood, Jessica L.; Gaulandri, Cecilia; Pavel, Lauren; Paris, Brittany L.; Carter, Margaret M.; Linne, Paige; Moore, Grace E.; Arnold, Carolyn E.; Glass, Kati G.; Bradberry, Amanda; Jones, Trinette
- Abstract
Anthelmintics are commonly used in the equine industry to reduce parasite load, but there is a growing concern about anthelmintic resistance, especially in young horses where there is limited information available. Twenty-four, 2-yr-old Quarter Horses (825 ± 21 d of age, initial BW 409 ± 6 kg, 12 fillies and 12 geldings) originating from a single herd were used in a 42-d study to investigate the effectiveness of a commercial anthelmintic (fenbendazole) on fecal egg counts (FEC), hypothesizing that there would be a decrease in FEC following anthelmintic administration. Horses were housed individually (3.7m x 11m) and offered ad libitum Coastal Bermudagrass hay and water and fed a pelleted concentrate offered at 0.75% (as-fed) of their BW. During the 42-d study, BW was obtained and BCS were assigned in 21-d intervals. Fenbendazole was administered orally on d 0 and 14 dosed on BW per manufacturer label. Fresh fecal samples were collected on d 0 and 14, before anthelmintic administration, and on d 28 and 42. Fecal egg floats were conducted using the Modified Wisconsin Method, and eggs per gram (EPG) were determined in duplicate. A fecal egg count reduction test (FECRT) was calculated, beginning on d 14. Outliers were determined as values ± 2 standard deviations of the mean, and data were analyzed using PROC MIXED of SAS (v9.4) with the main effect of time. Horses increased in BW (P ≤ 0.01) over time, but BCS did not change (P = 0.25). Mean FEC increased over time (P ≤ 0.01), beginning on d 14, and remained increased to d 42 compared to baseline. However, there was a trend (P = 0.07) for mean FEC to be less on d 42 (189.70 ± 29 EPG) when compared with d 14 (251 ± 28 EPG). The calculated reduction of FEC were below the targeted 95% or greater and included d 14 (1.04%), d 28 (35%), and d 42 (41%). The increased shedding of eggs did not negatively impact BW or BCS. However, we reject the hypothesis since FEC increased following an-thelmintic treatment, indicating the need for consistent monitoring of anthelmintic efficacy in young horses.
- Subjects
FECAL egg count; HORSES; HAY; ANIMAL weaning; PELLETED feed; HAY as feed; HORSE industry
- Publication
Journal of Animal Science, 2024, Vol 102, p95
- ISSN
0021-8812
- Publication type
Abstract
- DOI
10.1093/jas/skae019.114