PMID- 10521042 OWN - NLM STAT- MEDLINE DCOM- 19991109 LR - 20190513 IS - 0021-8812 (Print) IS - 0021-8812 (Linking) VI - 77 IP - 10 DP - 1999 Oct TI - Effects of different supplemental sugars and starch fed in combination with degradable intake protein on low-quality forage use by beef steers. PG - 2793-802 AB - Twenty ruminally fistulated steers (Exp. 1, 448 kg and Exp. 2, 450 kg) were used in two consecutive randomized complete block experiments with five treatments in each experiment. The purpose was to evaluate the impact of feeding different supplemental sugars or starch in combination with supplemental degradable intake protein (DIP) on the utilization of low-quality tallgrass-prairie hay. In Exp. 1, steers were given ad libitum access to forage and, except for the negative control (NC), received a limited supply (insufficient to maximize forage use) of supplemental DIP (.031% BW/d, DM basis). In addition to the NC, this experiment included four supplementation treatments in which one of four carbohydrate (CHO) sources (starch, glucose, fructose, or sucrose) was fed at .30% BW of DM/d. In Exp. 2, the treatment structure was identical except that the supplemental DIP level (.122% BW, DM basis) was near the level needed to maximize forage use. Forage OM intake (FOMI) was not affected (P> or =.26) by supplementation in Exp. 1 but was increased (P = .05) in Exp. 2. However, no difference (P> or =.46) in FOMI occurred among CHO sources in either experiment. Total OM and digestible OM intakes were increased (P<.01) by supplementation in both experiments. In Exp. 1, no difference (P>.26) in OM digestion (OMD) occurred among treatments. In Exp. 2, supplementation increased (P<.01) OMD. Additionally, sugars yielded a higher (P = .04) OMD than starch, and the monosaccharides yielded a higher (P = .02) OMD than sucrose. In Exp. 1, NDF digestion (NDFD) was decreased (P = .02) by supplementation, but no differences (P> or =.21) occurred among CHO sources. In Exp. 2, NDFD was increased (P = .03) by supplementation. Additionally, sugars led to higher (P = .05) NDFD than starch, and the monosaccharides led to higher (P = .03) NDFD than sucrose. In both experiments, discernible patterns were observable with regard to the effects of supplementation and type of supplemental CHO on ruminal fermentation characteristics. In conclusion, even though some consistency in fermentation profiles for different carbohydrate sources was evident in both experiments, forage intake and digestion responses were not consistent across experiments. This raises the possibility that carbohydrate source may interact with the amount of supplemental DIP fed and, as such, deserves additional investigation. FAU - Heldt, J S AU - Heldt JS AD - Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506-1600, USA. FAU - Cochran, R C AU - Cochran RC FAU - Stokka, G L AU - Stokka GL FAU - Farmer, C G AU - Farmer CG FAU - Mathis, C P AU - Mathis CP FAU - Titgemeyer, E C AU - Titgemeyer EC FAU - Nagaraja, T G AU - Nagaraja TG LA - eng PT - Journal Article PL - United States TA - J Anim Sci JT - Journal of animal science JID - 8003002 RN - 0 (Dietary Carbohydrates) RN - 0 (Dietary Proteins) RN - 30237-26-4 (Fructose) RN - 57-50-1 (Sucrose) RN - 9005-25-8 (Starch) RN - IY9XDZ35W2 (Glucose) SB - IM MH - *Animal Feed MH - Animals MH - Cattle/*metabolism MH - Dietary Carbohydrates/metabolism/*pharmacology MH - Dietary Proteins/metabolism MH - *Dietary Supplements MH - Fermentation MH - Fructose/pharmacology MH - Glucose/pharmacology MH - Male MH - Starch/pharmacology MH - Sucrose/pharmacology EDAT- 1999/10/16 00:00 MHDA- 1999/10/16 00:01 CRDT- 1999/10/16 00:00 PHST- 1999/10/16 00:00 [pubmed] PHST- 1999/10/16 00:01 [medline] PHST- 1999/10/16 00:00 [entrez] AID - 10.2527/1999.77102793x [doi] PST - ppublish SO - J Anim Sci. 1999 Oct;77(10):2793-802. doi: 10.2527/1999.77102793x.