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Plasma Amino Acid Response Curves in Lactating Sows¹

Iowa Agriculture and Home Economics Experiment Station², Ames 50010

Abstract

Plasma amino acid response curves in lactating sows were determined in two experiments. The first experiment involved five levels of dietary lysine, and the second, five levels of dietary tryptophan. The statistical design in both experiments was a 5 x 5 latin square, with sows and stage of lactation representing rows and columns.

Postprandial plasma amino acid levels were more responsive to amino acid intake than were fasting levels in both experiments. Stage of lactation (during a 27-day lactation period) did not significantly affect the response curves. The response curves provided estimates of amino acid requirements (0.47 to 0.50% for lysine, and 0.066 to 0.091% for tryptophan) that were in reasonable agreement with published values. Plasma urea values were high when either lysine or tryptophan was deficient and decreased as the dietary amino acid balance improved.

¹ Journal Paper No. J-7690 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project No. 1786.

² Department of Animal Science.