Utilization of alkaline hydrogen peroxide-treated wheat straw in cattle growing and finishing diets
1991
Willms, C.L. | Berger, L.L. | Merchen, N.R. | Fahey, G.C. Jr
Two experiments were conducted to evaluate alkaline hydrogen peroxide-treated wheat straw (AHPWS) in cattle growing (Exp. 1) and finishing (Exp. 2) diets. In Exp. 1, 162 crossbred steers (257 kg) were fed 66% roughage diets in an 84-d growth trial to compare AHPWS to corn silage (CS) and to evaluate different supplemental CP sources and levels. A completely randomized design with a 3 X 3 factorial arrangement of treatments was used. Factors were roughage source (CS, a 1:1 mixture of CS:AHPWS [MIX] and (ABPWS) and CP treatment (13 and 11% CP with supplemental CP provided by soybean meal [13-SBM] and [11-SBM] and 11% CP with a combination of urea, corn gluten meal, and fish meal [UGF]). Lasalocid was fed at the rate of 200 mg per steer daily. Steers fed AHPWS had decreased (P < .01) DMI compared with steers fed PM and CS. This may be due to increased dietary Na from residual Na in AHPWS. With each incremental increase in AHPWS, ADG and gain/feed decreased (P < .01). Dry matter intakes (kg/d), ADG (kg), and gain/feed for CS, MIX, and AHPWS were 8.0, 1.56, and .19; 8.2, 1.33, and .16; and 7.5, 1.08, and .14, respectively. Decreased performance by steers fed AHPWS may be due, in part, to a negative interaction between the lasalocid and dietary minerals. There were no differences in performance due to CP supplementation. In Exp. 2, AHPWS was compared to alfalfa hay (AH) and CS at 10 and 20% of dietary DM (2 X 3 factorial) in a 127-d finishing trial with 108 crossbred steers (341 kg). There were no differences in performance due to roughage source. Steers fed 10% roughage had similar ADG, lower DNH (P < .05), and tended (P = .07) to have higher gain/feed than steers fed 20% roughage. Yield grade, fat thickness, and incidence and severity of liver abscesses were similar among treatments. Results indicate that AHPWS can support satisfactory performance in both growing and finishing cattle diets.
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