U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 Cell Wall Biology and Utilization Research: Madison, WI
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    CareersSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Midwest Area Madison, Wisconsin U.S. Dairy Forage Research Center Cell Wall Biology and Utilization Research Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            Hall, Mary Beth
  Submitted to: Symposium Proceedings
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 4/7/2009
                                    Publication  Date: 9/6/2009
                                    Citation: Hall, M. 2009. Protein and Carbohydrate Interactions Alter Ruminal Fermentation, Digesta Characteristics, and Behavior in Lactating Dairy Cattle. In: Proceedings of Eleventh International Symposium on Ruminant Physiology, September 6-9, 2009, Clermont-Ferrand, France. p. 202-203.Interpretive Summary:
                                Technical Abstract: The effect of altering dietary nonfiber carbohydrate complement and ruminally degradable protein was evaluated in an incomplete partially balanced Latin square design with a 2 x 2 factorial arrangement of treatments (trt) and two 21-d periods. Eight ruminally cannulated Holstein dairy cows were randomly assigned to a series of dietary trts: supplementation with the nonfiber carbohydrates (NFC) sucrose (SUC) or corn starch (STA) at 10% of diet DM, and relative modification of dietary ruminal protein degradability (RDP) by supplementation with 48% soybean meal (+RDP) or expeller soybean meal + 48% soybean meal (-RDP). All diets contained 33% corn silage and 22% alfalfa silage, on a DM basis. Diets were formulated to contain 30% NDF, 17.3% CP, and 41% NFC.  Cows were offered the diets ad libitum. Sample and data collections were made in the last 7 d of each period. DM intake did not differ among treatments (P>0.56).
Ruminal pH was lower with SUC than STA diets (P=0.01), and a NFCxRDP interaction showed lower ruminal pH with -RDP than +RDP for SUC, and +RDP than –RDP for STA (P<0.01). The sum of millimolar concentrations of acetate, propionate, butyrate, valerate, and lactate and the carbon they contain was greater with SUC (P<0.01). The carbon in organic acids tended to follow the inverse of the NFCxRDP pattern shown for pH: greater for SUC-RDP than +RDP, and greater for STA-RDP than +RDP (P=0.08). Ruminal NH4 was greater with SUC+RDP than –RDP, but did not differ by RDP treatment with STA (NFCxRDP effect, P=0.04). Digesta DM% tended to be lower with (14.5%) than for STA (15.0%)(P=0.06). Digesta DM kg did not differ by trt (mean = 13.1 kg; P>0.19), but digesta liquid kg was greater for SUC (79.2 kg) than for STA (72.2 kg; P<0.01). Rumination did not differ by trt (mean = 441 min/d; P>0.21), but time spent both eating and standing were greater on the –RDP trt (RDP effect: P<0.03), with the difference between +RDP and –RDP being greater with SUC than with STA (NFCxRDP effect, P<0.05). That ruminal fermentation and digesta characteristics and behaviour changed with changing dietary NFC source and relative level of RDP, suggest that such dietary changes can alter nutrients available to the animal, passage kinetics, and maintenance requirements, thus affecting animal performance.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov