J. Anim Sci.
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J. Anim Sci. 1988. 66:1982-1989.
© 1988 American Society of Animal Science
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Nitrogen Kinetics of Infectious Bovine Rhinotracheitis-Stressed Calves1,2,

Carolyn Orr3, D. P. Hutcheson4, J. M. Cummins5 and G. B. Thompson4

Texas A&M Research Center, Amarillo 79106

Abstract

Eight crossbred feeder steers were used in two consecutive N balance studies to investigate the effects of infectious bovine rhinotracheitis virus (IBRV) on N kinetics. Balance Study 1, which followed a 10-d acclimation phase, consisted of 7 d of sample collection referred to as the healthy phase (d –7 to d –1). Study 2, the IBRV-infected phase, began 2 d after a nasal IBRV challenge and continued for 6 d (d 2 to d 8). A stable isotope, [15N]-glycine, was used to determine N kinetics in both studies. Steers weighed 203 kg at the beginning of the study, 208 kg at IBRV infection and 194 kg at the end of study. Infection with IBRV increased (P < .05) urinary N excretion from 17.9 to 31.5 g/d. Daily N balance was reduced (P < .05) during infection from 21.2 to –3.3 g/d. Total serum proteins increased (P < .05) during infection from 6.6 to 7.1 g/100 ml, the increase being predominantly in the alpha and gamma globulin fractions. Blood urea-N increased (P < .05) during infection from 6.5 to 12.9 mg/100 ml. The urine excretion curve of the stable isotope and the N balance data indicated that IBRV infection increased N turnover and altered tissue utilization of N.

Footnotes

1 Technical article no. 22634 of the Texas Agric. Exp. Sta., Texas A&M Univ.

2 Mention of a trade name, proprietary product or specific equipment does not constitute a guarantee or warranty by Texas A&M Univ. and does not imply its approval to the exclusion of other products that may be suitable.

3 Berea College, Berea, KY 40404.

4 Texas Agric. Exp. Sta., Amarillo 79106.

5 Amarillo Cell Culture Company, Amarillo 79106.






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Copyright © 1988 by the American Society of Animal Science.