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Title: POULTRY BYPRODUCT MEAL AS A SOURCE OF SUPPLEMENTAL NITROGEN FOR RUMINANTS: I. EFFECTS ON GROWTH, GAIN EFFICIENCY, AND PROTEIN EFFICIENCY

Author
item BOHNERT, D. - UNIVERSITY OF KENTUCKY
item LARSON, B. - UNIVERSITY OF KENTUCKY
item BAUER, M. - UNIVERSITY OF KENTUCKY
item BRANCO, A. - UNIVERSITY OF KENTUCKY
item HARMON, D. - UNIVERSITY OF KENTUCKY
item McLeod, Kyle
item MITCHELL, JR., G. - UNIVERSITY OF KENTUCKY

Submitted to: Journal of Animal Science
Publication Type: Abstract Only
Publication Acceptance Date: 7/24/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Poultry byproduct meal (PBM) was evaluated as a source of supplemental N for ruminants. An in situ study compared ruminal N degradation of PBM to soybean meal (SBM), blood meal (BM) and corn gluten meal (CGM). In another experiment, ninety-five crossbred steers (228 ñ 1 kg; 4 steers/pen; 6 treatments; 4 pens/treatment) were used for an 84 d growth trial. Treatments were SBM and graded amounts of PBM (0, 25, 50, 75 and 100 %) with urea used to balance for N in the PBM supplements. Diets were offered ad libitum, formulated to contain 11.5% CP, and consisted of 49% corn silage, 36% cottonseed hulls and 15% supplement (DM basis). In situ N disappearance (%) at o h was not different (P > .05) for BM and CGM (-1.3 and -.1); however, PBM had greater 0 h disappearance than SBM (28.8 vs. 15.5; P < .05). Ruminal escape N (%) was different (P < .05) for each N source (25.2, 55.2, 98.9 and 86.7 for SBM, PBM, BM and CGM, respectively; assumed passage rate constant of .05/h). Steer DMI, ADG and gain/feed all responded linearly to increasing amounts of PBM (P < .01). The 100% treatment was not different (P > .05) from SBM for DMI, ADG or gain/feed while 0% was different (P < .01) from SBM for each of the aforementioned variables. Protein efficiency of PBM was 1.08 kg gain/kg natural protein. These studies suggest that PBM and SBM possess N of comparable quality for growing steers.