| Abstrakt: |
The objectives of this experiment were to evaluate early- and late-maturing cultivars of oat (Avena sativa L.), spring wheat (Triticum aestivum L.), and spring barley (Hordeum vulgare L.) for autumn forage production and nutritive value. Early- and late-maturing cultivars evaluated were 'Newport' and 'Hays' barley, 'Select' and 'Iguacu' wheat, and 'Ogle' and 'ForagePlus' oat. Field plots were arranged in a randomized complete block design with six replications (blocks) each year for 72 plots across the 2-yr trial. For 2016, yields of dry matter (DM) were greatest for the barley cultivars (mean = 6,828 lb DM acre-1); all the other cultivars exhibited similar yields (P > 0.05; mean = 5,597 lb DM acre-1). For 2017, the yield responses forNewport barley (4,422 lbDMacre-1)were greater than all other cultivars, which did not differ from each other (P > 0.05; mean = 2,712 lb DMacre-1). Generally, wheat and oat cultivars differed by earlyor late-maturing designation for most measures of nutritive value; however, barley cultivars differed only for whole-plant ash. Total digestible nutrients were similar (P > 0.05) for early-maturing Newport barley and all late-maturing cultivars (mean = 66.0%); collectively, their energy densities were greater than those observed for early-maturing Select wheat (62.8%) or Ogle oat (61.3%). Within species, in vitro disappearance of DM and fiber were greatest for the late-maturing cultivars, with ForagePlus exhibiting the greatest disappearance. Spring wheat or barley are viable choices for emergency autumn forage in the north-central United States. [ABSTRACT FROM AUTHOR] |
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