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
 Livestock Issues Research: Lubbock, TX
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    Careers


        


                    NewsletterSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Plains Area Lubbock, Texas Cropping Systems Research Laboratory Livestock Issues 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
                                            ALTMAN, ALEXANDER - University Of Kentuckyitem
                                            VANZANT, ERIC - University Of Kentuckyitem
                                            Carroll, Jeffery

                                                         - *Jeff Carroll*item
                                            Sanchez, Nicoleitem
                                            MCLEOD, KYLE - University Of Kentucky
  Submitted to: Journal of Animal Science
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 1/8/2016
                                    Publication  Date: 3/4/2016
                                    Citation: Altman, A.W., Vanzant, E.W., Carroll, J.A., Sanchez, N.C., Mcleod, K.R. 2016. Heat production, respiratory quotient, and methane loss subsequent to LPS challenge in beef heifers. Journal of Animal Science. 94:No. Supplement 1, pg.20.Interpretive Summary:
                                Technical Abstract: Respiration calorimetry was used to measure energy utilization during an acute phase response (APR) to lipopolysaccharide (LPS). Eight Angus heifers (208 +/- 29.2 kg) were randomly assigned to one of two calorimeters in four 2-day periods for measurement of heat production (HP), methane (CH4), and respiratory quotient (RQ). Corn silage diets were fed at 1.0 X NEm. Exit velocity measured at weaning (wEV) was an indicator of temperament. Rectal temperature (RT) was recorded every five minutes using indwelling temperature loggers. Data from day 1 served as a control (CON) for each heifer. Lipopolysaccharide was administered intravenously at 0.5 micrograms/kg body weight 2 hours after feeding on day 2 (0 hour). Respiratory gas exchange was determined at 10 minute intervals from 0 hour to 24 hours. At each time point, RQ was determined and HP was calculated from O2,, CO2, and CH4 changes using Brouwer’s equation. Data were divided into two 12-hour periods (Phase I and Phase II) for repeated measures analysis with SAS Proc Mixed. After LPS, RT revealed a biphasic response typical of an LPS challenge. For both CON and LPS periods, RQ declined postprandially (0.95-1.00 to 0.85-0.90) across Phase I (time x LPS P<0.01). With LPS, RQ during the first 6 hours of Phase I tended to be more erratic, whereas values during the latter half of this phase were generally lower with than without LPS. A wEV x LPS interaction was detected for RQ during Phase II (P=0.05) in which LPS-induced depression in RQ increased with increasing wEV. The average RQ was 0.86 and 0.80 +/- 0.004 for CON and LPS, respectively, during Phase II. There was large individual animal variability in HP response to LPS in which some animals increased and some decreased HP in response to LPS. Thus, no time x LPS (P>0.10) or LPS (P>0.12) effects were found for HP in either phase. However, wEV effects were found (P<0.04) in both phases, where HP increased by about 7 to 8% of mean HP for each 1m/s increase in wEV. Methane production (L/min) was reduced by 23% with LPS in Phase I. In Phase II, LPS-induced reduction in CH4 was influenced by wEV (P=0.03). At low wEV, LPS effects were nonsignificant (P=0.17), whereas at average and high wEV, CH4 was depressed (P<0.01) by 33 and 54%, respectively. Heat production responses during the APR of LPS challenge were highly variable among individuals, yet HP among individuals was related to weaning exit velocity.


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