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ARS Home Plains Area Lubbock, Texas Cropping Systems Research Laboratory Livestock Issues Research Research Publications at this Location





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Title:   Author  item
                                            BURDICK, NICOLE - TEXAS A&M UNIVERSITYitem
                                            Hulbert, Lindseyitem
                                            Carroll, Jeffery

                                                         - *Jeff Carroll*item
                                            RANDEL, RON - TEXAS AGRILIFE RESEARCHitem
                                            VANN, RHONDA - MISSISSIPPI STATE UNIVitem
                                            WILLARD, SCOTT - MISSISSIPPI STATE UNIVitem
                                            CALDWELL, LISA - TEXAS A&M UNIVERSITYitem
                                            LOYD, ANDREA - TEXAS A&M UNIVERSITYitem
                                            Dailey, Jefferyitem
                                            WELSH JR., TOM - TEXAS A&M UNIVERSITY
  Submitted to: Beef Cattle Research in Texas
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 9/1/2008
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary: A collaborative study was conducted involving scientists from the Livestock Issues Research Unit, Mississippi State University, Texas A&M University, and the Texas AgriLife Research Center in Overton, TX, to determine if an animal's temperament would influence its innate immune response to an endotoxin challenge. For this study, 25 yearling were fitted with rectal temperature devices that measured at 1-minute intervals. Bulls were also fitted with jugular catheters and blood samples were collected and serum isolated every 30 minutes beginning 2 hours prior to and 8 hours after administration of an endotoxin for determinations of cortisol (radioimmunoassay) and epinephrine (enzyme immunoassay) concentrations. At similar time-points (-0.5 to 6 hours), sickness behavior was determined on a scale of 1 (lying on side with labored breathing) to 5 (active). Results revealed that temperament differentially affected the stress response to the immune challenge with the response of epinephrine, not cortisol, to endotoxin being affected by temperament. This data suggests that temperament affects the degree of innate immune response to an endotoxin challenge, with calm animals displaying more signs of sickness. The results of this research will be of particular interest to beef cattle feedlot managers, veterinarians managing the health of feedlot cattle, and scientists, whether from industry, academia, or industry, working in the area of beef cattle production, health, and well-being.
                                Technical Abstract: This study was designed to determine the influence of temperament on body temperature, sickness behavior, and the secretion of cortisol and epinephrine in response to an endotoxin challenge. Purebred Brahman bulls were selected based on temperament score measured at weaning [n=8 each Calm (C), Intermediate (I), and Temperamental (T)]. Bulls were fitted with rectal temperature (RT) devices and indwelling jugular catheters were placed in all bulls. Blood samples were collected and serum isolated every 30 minutes beginning 2 hours prior to and 8 hours after administration of lipopolysaccharide (0.5 micrograms/kg) for determination of cortisol (CS) and epinephrine (EPI) concentrations. At similar time-points (-0.5 to 6 hours), sickness behavior (SB) was determined on a scale of 1(lying on side with labored breathing) to 5 (active). Temperament differentially affects the stress response to LPS with the response of epinephrine, not cortisol, to LPS being affected by temperament. This data suggests that temperament affects the degree response to an endotoxin challenge, with calm animals displaying more signs of sickness. Therefore, this may allow for earlier treatment and therefore minimize the negative impacts of illness on growth and production.


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