Abstract
Endophyte-infected fescue hay (EIFH) was harvested during May from a pasture from a 100% Acremonium coenophialum infection. The effects of feeding treatments 1) EIFH, 2) EIFH with lasalocid, 3) ammoniated EIFH, 4) EIFH with acetylsalicylic acid (ASA), 5) EIFH with selenium-zinc-vitamin E (SeZnE), and 6) EIFH with thiabendazole (TBZ) on gain, body temperature, hay consumption, and feed efficiency were evaluated for a 56-d period during September and October. Forty-eight Hereford x Angus steers averaging 207kg were selected for tendency to elevate body temperature when given access to 100% endophyte-infected fescue pasture. Steers were fed individually and hay was offered at a rate of 2.4% of shrunk body weight, which was adjusted after 28 d. Feed consumption was recorded daily and individual body temperatures were taken twice weekly. Steers were supplemented daily with .9kg of ground shelled corn containing the specified treatment compound. A mineral mixture was provided free choice. Steers fed the ammoniated EIFH gained more (P<.05) than those fed EIFH or EIFH with TBZ. Temperatures of steers fed ammoniated EIFH were lower during the second 28 d than for all other treatments and were lower (P<.05) after 56 d than those of steers fed EIFH (control), EIFH with lasalocid, or EIFH with TBZ. Lasalocid, ASA, SeZnE, or TBZ did not increase gain or decrease body temperature when compared to steers fed EIFH.
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