Feeding value of frost-damaged soybeans for lambs
1992
Loesche, J.A. | Pritchard, R.H. | Reecy, J.M. | Wicks, Z.W. III.
Three experiments were conducted to determine the relative feeding value of frost-damaged soybeans (FDS) for ruminants. Frost-damaged soybean ether-extract content was variable and differed (P < .05) from mature soybeans. Isonitrogenous supplementation of corn silage diets with soybean meal (SBM), SBM + soybean oil (SBO), mature raw soybeans (MSB), and FDS was compared in sheep. Acid detergent fiber and apparent N digestion were lower (P < .001) for supplements containing oil. Nitrogen retention was reduced (P < .07) only for raw soybean supplements. Ruminal NH3 N and branched-chain VFA concentrations differed (P < .01) between SBM and supplements containing oil. Maximum tolerable inclusion level of FDS in corn silage diets was tested in wethers using diets containing 0, 7, 14, or 21% FDS. Dry matter and ADF digestibility declined linearly (P < .01) with increasing dietary FDS. Ether extract digestibility was unchanged due to treatment, but GE digestibility decreased quadratically (P < .01). The most pronounced decline in GE digestibility occurred when FDS increased from 14 to 21% of the diet. The effects of FDS on corn silage utilization were similar to MSB effects. Oil content and antinutritional factors contributed to detrimental effects. Frost-damaged soybeans should not exceed 14% of corn silage diets fed to growing wethers.
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