J. Anim Sci.
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J. Anim Sci. 1973. 36:245-251.
© 1973 American Society of Animal Science
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Hepatic Portal Catheterization and Comparison of Portal and Anterior Vena Cava Free Plasma Amino Acid Patterns in the Baby Pig1

A. Shimada M.2 and Dean R. Zimmerman

Iowa Agriculture and Home Economics Experiment Station, Ames3

Abstract

A technique was developed to obtain hepatic portal blood from baby pigs by placing a catheter via the umbilical vein into the ductus venosus of the liver. The operation was made on pigs 5 days of age and blood could be obtained from the catheter for up to 2 weeks.

Portal and systemic (anterior vena cava) PAA levels were compared in a series of trials. PAA levels in portal blood of suckling pigs were consistently greater than in systemic blood. After 6 hr. of fast, portal and systemic PAA levels were similar and, in most cases, reached minimum levels at 12 hr., followed by a slight increase at 18 hours. In pigs fasted for 24 hr. and then allowed a single 30-min. suckling period, the difference between portal and systemic PAA levels increased to 1 hr. postprandial, followed, in most cases, by a rapid decrease to 2 hr. and slower declines to 4 and 8 hr. postprandial. For the essential amino acids, the levels in milk protein were highly correlated (0.92) with the portal-systemic PAA level differences at 1 hour. Portal PAA levels were compared in pigs fed heated and raw extracted soybean meal. The heated-raw PAA level differences after oral dosing indicated more efficient absorption of amino acids from heated soybean meal.

Footnotes

1 Journal Paper No. J6947 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Project No. 1784.

2 Supported by a Rockefeller Foundation Fellowship. Present address: Institute Nacional de Investigaciones Pecuarias, Km. 151/2 Carr., Mexico-Toluca, Palo Alto, D. F. Mexico.

3 Department of Animal Science.






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Copyright © 1973 by the American Society of Animal Science.