Effect of Increasing Degradable Intake Protein on Intake and Digestion of Low-Quality, Tallgrass-Prairie Forage by Beef Cows

H. H. Köster, R. C. Cochran, E. C. Titgemeyer, E. S. Vanzant, I. Abdelgadir, G. St-Jean

Research output: Contribution to journalArticlepeer-review

190 Scopus citations

Abstract

Five ruminally and duodenally fistulated Angus × Hereford cows were used in a 5 × 5 Latin square to monitor intake, ruminal fermentation responses, and site and extent of digestion associated with providing increasing amounts of supplemental degradable intake protein (DIP). Cows had ad libitum access to low-quality, tallgrass-prairie forage (1.9% CP, 77% NDF) that was fed twice daily. The supplemental DIP (sodium caseinate; 90% CP) was infused intraruminally at 0630 and 1830 immediately before feeding forage. Levels of DIP were 0, 180, 360, 540, and 720 g/d. Each period consisted of 14 d of adaptation and 6 d of sampling. Forage OM intake increased quadratically (P < .01) with increasing supplemental DIP, reaching a peak at the 540 g/d level. True ruminal OM and NDF digestion increased with the addition of 180 g/d supplemental DIP, but exhibited only moderate and somewhat variable responses when greater amounts of supplemental DIP were infused (cubic, P ≤ .03). Microbial N flow and efficiency increased linearly (P < .01) with increasing supplemental DIP. However, a quadratic effect (P < .01) was observed for total duodenal N flow, which was maximized at 540 g/d supplemental DIP. A linear (P = .02) treatment effect was observed for ruminal fluid dilution rate. Total ruminal VFA and ammonia concentrations increased (P < .01) in response to DIP supplementation. In conclusion, increasing supplemental DIP generally improved forage utilization; intake of digestible OM was maximized when it contained approximately 11% DIP.

Original languageEnglish
Pages (from-to)2473-2481
Number of pages9
JournalJournal of Animal Science
Volume74
Issue number10
DOIs
StatePublished - Oct 1996

Keywords

  • Beef Cows
  • Digestibility
  • Forage
  • Intake
  • Rumen Fermentation
  • Supplements

ASJC Scopus subject areas

  • General Medicine

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