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Alternate Day Supplementation Of Corn Stalk Diets For Ruminants With High Or Low Ruminal Escape Protein Supplements, R.M. Collins, R.H. Pritchard

South Dakota Beef Report, 1990

Two experiments were conducted to determine the effects of feeding soybean meal (SBM) and corn gluten meal (CGM) based, isonitrogenous supplements at 24- or 48-hour intervals on corn stalk utilization. Exp. 1. Yearling rams were fed either protein supplement as 100 g daily or 200 g on alternate days. DM1 was lower (Pc.10) for the CGM than SBM based supplements. Protein source and interval of feeding did not affect (P>.10) digestible dry matter intake (DDMI) or disappearance of dry matter (DMD), but an interaction was observed (P<.05) between protein source and interval of feeding. Nitrogen retention was greater for CGM (P<.10) and 48-hour supplementation (P<.01). However, an interaction between protein source and interval of feeding occurred (P<.10) for N retention. Exp. 2. Angus and Hereford x Anugs steers (119 head; 620 ± 1.9 Ib) allotted to 8-head pens were fed similar diets except supplements (46% crude protein) also provided 0 (OM) or 200 (200M) mg per head per day monensin. CGM supported higher (Pc.05) ADG and gain/feed (G/F) than SBM, but a protein by monensin interaction occurred (Pc.10) for ADG and GIF. There was an interval by monensin interaction for ADG (P<.10) and DM1 (P<.05). An interaction between protein and interval occurred for plasma urea N on day 1 (P<.01) and day 2 (P<.10) of the sampling period. CGM was an effective isonitrogenous substitute for SBM based supplements in these applications. Supplementation at 48-hour intervals supported higher N utilization. High intermittent dosages of monensin appeared detrimental to calf performance.