J. Anim Sci.
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J. Anim Sci. 1980. 51:74-77.
© 1980 American Society of Animal Science
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Urinary and Caudate Nuclei Catecholamine Levels in Stress-Susceptible and Normal Swine1 ,2,

Douglas M. Altrogge3, David G. Topel, Margaret A. Cooper, John W. Hallberg and Donald D. Draper4

Iowa State University, Ames 50011

Abstract

Eight stress-susceptible and eight normal pigs were used in the first portion of the study. Urine samples were collected for 24 hr over 4 consecutive days while the pigs were kept in metabolism cages. Each 24-hr sample was assayed for epinephrine, norepinephrine and dopamine. Urinary levels of dopamine were lower (P<.01) in the stress-susceptible pigs. No significant differences in urinary epinephrine or norepinephrine were observed. The second portion of the study evaluated the catecholamines in the caudate nucleus of the brain. Six stress-susceptible and six control pigs were examined. Immediately after exsanguination, caudate nuclei were excised and frozen in liquid nitrogen. The caudate nuclei were assayed for catecholamines within 2 to 3 days of freezing. Caudate nuclei dopamine levels were lower (P<.01) in stress-susceptible pigs (5,961 ng/g) than in control pigs (10,878 ng/g). No significant differences in norepinephrine levels of the caudate nuclei were observed between the two groups.

Footnotes

1 Journal Paper No. J-9671 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 2176. This study was supported in part by the USDA, CSRS contract No. 70442.

2 Appreciation is expressed to Terri Wierenga for her technical assistance and to Dr. P. J. Berger for statistical assitance. The authors thank Dr. Lauren Christian and Dr. R. A. Rasmusson for the bloodtype and CPK classification information.

3 Dept. of Anim. Sci., 215 Meat Lab.

4 Dept. of Vet. Anat.






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