PS-3 Effects of Feeding Rates on Diflubenzuron Efficacy Against Filth Flies (Diptera: Muscidae) in Manure of Beef Heifers

Abstract The objective of the current study is to determine effect feeding rates on efficacy diflubenzuron against filth fly development in manure beef heifers. Twelve Angus × Hereford crossbred heifers (263 kg ± 16.2 BW) were used a completely randomized design and assigned 2 x factorial arrangement treatments evaluate horn flies Haematobia irritans (L.), stable Stomoxys calcitrans house Musca domestica utilizing fecal bioassays. Treatments consisted insecticidal [Diflubenzuron (DFB; 0.10 mg per no DFB (CNT)] with dietary fed regimens [1.5% BW alfalfa hay cubes 3.0% cubes]. All receiving dosed daily beginning day 0 continuing through 7. Manure samples collected prior offering for 11 consecutive days. Efficacy calculations developed standard bioassays accounting control performance. A treatment interaction (P ≤ 0.01) was observed all species largely associated presence on-set (day 0–2) wash out 8–10) product. Feeding regimen did not > 0.05) influence performance any evaluated. Formulations appear handle wide range animal intake scenarios under controlled situations.