J. Anim Sci.
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J. Anim Sci. 1969. 29:429-432.
© 1969 American Society of Animal Science
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Effect of Protein Level during Pregnancy and Lactation on Plasma Amino Acid Profile of Swine1

E. W. Lucas2, P. J. Holden, V. C. Speer and V. W. Hays3

Iowa Agriculture and Home Economics Experiment Station, Ames ,4

Abstract

The plasma amino acid profiles of sows fed diets containing 8.0, 12.0, 16.0 and 20.0% protein were studied during the gestation and lactation periods for four successive reproductive cycles. Plasma levels of arginine, isoleucine, leucine, lysine, threonine and valine averaged over gestation and lactation increased linearly, and histidine, methionine and phenylalanine increased quadratically with increasing levels of dietary protein. Tyrosine also increased linearly, but cystine was not affected by dietary protein. Plasma levels of arginine, lysine, methionine and threonine were significantly higher during gestation than during lactation, but the level of histidine was significantly higher during lactation. Leucine and valine plasma levels increased more rapidly during lactation than during gestation with increasing dietary protein levels. Plasma levels of total essential amino acids (tryptophan not included) increased linearly with increasing levels of dietary protein and were significantly lower during lactation than during gestation.

Footnotes

1 Journal Paper No. J.5958 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No.

2 Present address: Department of Animal Science, University of Florida, Gainesville.

3 Present address: Department of Animal Sciences, University of Kentucky, Lexington.

4 Department of Animal Science.






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Copyright © 1969 by the American Society of Animal Science.