Two experiments were conducted to determine the effects of daily (D) vs
alternate day (AD) supplementation of soybean meal (SBM) or wheat
middlings (WM) on forage organic matter intake (OMI), ruminal digesta
kinetics, total tract digestibility, and ADG of steers consuming low quality
forage. In Exp. 1, five Angus x Hereford steers (403 �� 32 kg) fitted with
rumen cannulas were utilized in a 5 x 5 Latin square design. Steers were
individually fed low-quality (5.3% CP) fescue hay ad libitum and were
randomly assigned to one of five treatments: no supplement (CON); WM
fed daily (WMD); WM fed every other day (WMAD); SBM fed daily (SBMD);
and SBM fed every other day (SBMAD). Supplements were formulated to
meet 100% of degradable intake protein (DIP) and metabolizable protein
(MP) requirements. Supplementation increased (P<0.05) hay and total
OMI (g���kg��������BW�����) and total OM digestibility (%) compared to CON. Daily
supplementation increased (P<0.05) hay and total OMI and hay and total
OM digestibility when compared with AD supplementation. Hay OMI and
hay OM digestibility was greater (P<0.01) for SBM compared to WM, but
total OMI and total OM digestibility was not different (P>0.38). In Exp. 2,
96 Angus crossbred steers (280 �� 32 kg) were blocked by weight (three
groups) into 12 pens in a randomized complete block design. Steers were
fed low-quality (6.2% CP) fescue straw ad libitum, and one of four
supplements formulated to meet 100% of the DIP requirements: WM fed
daily (WMD); WM fed 3d/week (WMAD); SBM fed daily (SBMD); and SBM
fed 3d/week (SBMAD). Straw OMI was greater (P<0.03) for D compared
with AD supplemented treatments and for SBM compared with WM
supplemented treatments. Total OMI was greater (P<0.01) for D
compared with AD supplemented treatments, however, SBM had similar
total OMI when compared with WM supplemented treatments. Daily
supplemented steers had greater (P=0.03) ADG when compared with AD
supplemented steers. Despite having lower forage intake and similar total
OMI, steers consuming WM had higher (P<0.01) ADG when compared to
steers consuming SBM. / Graduation date: 2003
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/31848 |
| Date | 22 July 2002 |
| Creators | Shirley, Tyson R. |
| Contributors | Ackerman, Callan J. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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