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We compared the forage preferences of steers grazing among 8 varieties of grasses at 2 stages of phenology on the Northern Great Basin Experimental Range near Burns, Ore. Varieties included: ‘Nordan (Agropyron desertorum (Fischer ex Link)Schultes) and ‘CD-II’ (A. desertorum X A. cristatum (L.) Gaertner) crested wheatgrass; ‘Magnar’ and ‘Trailhead’ Basin wildryes (Leymus cinereus (Scribner & Merrill) A. Liive); ‘Golda? bluebunch wheatgrass (Pseudoroegneria spicata (Pursh)A. Liive); ‘Bozoisky-Select’ Russian wildrye (Psathyrostachys junceus (Fischer) Nevski); ‘Bannock’ thickspike wheatgrass (Elymus lanceolatus ssp. lanceolatus (Scribner & J.G. Smith) Gould), and ‘Secar’ Snake River wheatgrass (proposed nomenclature Elymus lanceolatus ssp. wawawaiensis (Scribner & J.G. Smith) Gould). Three esophageal-Bstulated steers grazed each paddock, with 3 paddocks grazed at the boot stage of development, and 3 paddocks grazed after grasses entered quiescence. In boot-stage trials, steers were very selective and collectively harvested 53% of total bites from the preferred CD-II and Nordan. These crested wheatgrasses also ranked higher (P 0.95, P < 0.01) with total bites harvested from varieties and are probably adequate for ranking relative preferences of steers. By selectively grazing at both stages of phenology, cattle diets were hlgher in CP, P, and ADL than the standing crop. During boot-stage trials, diets were also higher in Ca and Mg than forage analyses would suggest Except for phosphorus, the nutritive content of all varieties was satisfactory for lactating beef cattle at both stages

Preferences and Behavior of Cattle Grazing 8 Varieties of Grasses