beef, corn silage, feedlot
The relative feed value of a corn variety developed for the primary purpose of corn silage production was evaluated using a 70-d steer growing trial. The high fiber corn (CSV1) and conventional corn (CSV2) varieties were planted in adjacent plots and harvested at approximately 30% DM. Silage varieties were stored in separate bunker silos and allowed to ferment for 52 d. CSVl yielded 5.4 T/acre while CSV2 yielded 4.7 T/acre (DM basis). Variety affected (P<.001) NDF (43.3% vs 38.6%), ADF (24.1% vs 20.2%), lignin (5.7% vs 4.6%), starch (18.69% vs 30.18%) and CP content (7.37% vs 6.89%) of CSVl and CSV2, respectively. IVDMD was not, different (P>. 10) between varieties. One hundred sixty steers were divided into light (516 ± 7.1 Ib.) and heavy (595 ± 9.7 Ib.) BW groups. Steers within those groups were stratified by BW into 10 pens, and pens were randomly assigned to one of two corn silage variety treatments. Steers that were consuming CSV2 tended to gain faster (P<. 10) and were more efficient (P< .05). CSV2 had a greater (P<.05) caloric density than CSV1, as predicted by three prediction methods. Net energy values predicted using NIR were significantly (P=.05) lower than energy values predicted by proximate analysis or by steer performance. This trial demonstrates the need for multiple selection criteria when choosing a corn variety for corn silage production. CSVl yielded 1593 Ib. of beef per acre compared to 1417 Ib. of beef per acre yielded by CSV2 when evaluating varieties on a field-to-feedbunk basis.
Number of Pages
South Dakota State University
Copyright © 2000 South Dakota State University
Mueller, C. J.; Pritchard, R. H.; and Wicks, Z. W. III, "Relative Feed Values for High Fiber Corn and Conventional Corn Silage for Growing Steers" (2000). South Dakota Beef Report, 2000. 7.