Paper-Lecture38 - Effect of Increasing Degradable Intake Protein on Intake and Digestion of Low-Quality Tallgrass-Prairie Forage by Beef Cows1 H H

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2473 1 Contribution no. 96-218-J from the Kansas Ag. Exp. Sta. 2 Present Address: Dept. of Anim. Sci., Box 339, UOFS, Bloemfon- tein, 9300, South Africa. 3 To whom correspondence and reprint requests should be addressed. 4 Kansas State Univ. Ag. Res. Center—Hays, Hays 67601. 5 Dept. of Clinical Sciences. Received January 22, 1996. Accepted April 16, 1996. Effect of Increasing Degradable Intake Protein on Intake and Digestion of Low-Quality, Tallgrass-Prairie Forage by Beef Cows 1 H. H. Ko ¨ster 2 , R. C. Cochran 3 , E. C. Titgemeyer, E. S. Vanzant 4 , I. Abdelgadir, and G. St-Jean 5 Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506-1600 ABSTRACT: Five ruminally and duodenally fistu- lated 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 sup- plemental DIP generally improved forage utilization; intake of digestible OM was maximized when it contained approximately 11% DIP. Key Words: Beef Cows, Forage, Supplements, Intake, Digestibility, Rumen Fermentation J. Anim. Sci. 1996. 74:2473–2481 Introduction Low-quality forages are important sources of nutrients used to maintain beef cattle throughout the world. To optimize the utilization of these forages and maintain acceptable animal performance, it is gener- ally desirable to enhance intake and digestion via the provision of supplemental nutrients. Generally, degradable intake protein ( DIP ) is considered to be the dietary component that is “first limiting” to the utilization of low-quality forage. Therefore, providing supplements with adequate amounts of DIP to ruminants fed low-quality forage commonly promotes increased forage intake and flow of nutrients to the small intestine (Hannah et al., 1991; Lintzenich et al., 1995).
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This note was uploaded on 09/19/2011 for the course ANS 5446 taught by Professor Brown during the Spring '08 term at University of Florida.

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Paper-Lecture38 - Effect of Increasing Degradable Intake Protein on Intake and Digestion of Low-Quality Tallgrass-Prairie Forage by Beef Cows1 H H

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