Abstract
Summary Performance of ruminants consuming high-endophyte tall fescue ( Festuca arundinacea Schreb.) is frequently lower than when low-endophyte fescue or similar cool-season perennial grasses are ingested. This study was conducted to determine effects of different parasite treatments on daily gain by beef steers grazing high- or low-endophyte fescue (HE and LE, respectively). Ninety-six yearling Angus-Hereford steers (210 kg average initial weight) grazed HE or LE paddocks for 112 days. Steers received 1) a placebo sustained-release ruminal bolus on Day 0 (control), 2) a sustained-release ruminal bolus on Day 0 designed to deliver ivermectin at 12 mg/day for 120 days (IVM), 3) levamisole injections (subcutaneous) at 8 mg/kg body weight every 14 days (LEV) OR 4) IVM plus LEV (combination: COM). Daily gains over the entire study were .49 and .79 kg for HE and LE, respectively ( P P >.10). Trends were noted for an effect of treating for parasites ( P P P P >.10). Parasite control may affect daily gain by beef steers slightly more with HE than LE.
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