Individual response of growing pigs to sulphur amino acid intake

Journal of Animal Physiology and Animal Nutrition
J HegerD Hampel

Abstract

Two N balance experiments were conducted to study the individual response of growing pigs to limiting amino acid (AA) intake. Series of fifteen diets with increasing concentration of sulphur amino acids (SAA, Expt 1) or methionine in the presence of excess cystine (Expt 2) were fed sequentially to nine pigs during a 15-day experimental period. The concentration of the AA under test ranged from 50% to 140% of the requirement while other essential AA were given in a 25% excess relative to the limiting AA. N retention was related to the limiting AA intake using rectilinear and curvilinear models. In Expt 1, the quadratic-plateau model fitted the individual data significantly better (p = 0.01) than the linear-plateau model. No difference was found between the two models in Expt. 2, presumably due to the sparing effect of excess cystine on methionine utilization. Exponential, saturation kinetics or four-parameter logistic models fitted to data for all pigs showed that their goodness of fit was similar to those of quadratic-plateau or linear-plateau models. Significant differences (p < 0.05) were found between individual plateau values for N retention within each experiment while the slopes of the regression lines did not significant...Continue Reading

References

Aug 1, 1978·The Journal of Nutrition·L P MercerP H Morgan
Sep 1, 1992·The Journal of Nutrition·T K Chung, D H Baker
Sep 1, 1985·The British Journal of Nutrition·J Heger, Z Frydrych
Jan 1, 1983·Zeitschrift für Tierphysiologie, Tierernährung und Futtermittelkunde·P L Berende, H L Bertram
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May 1, 1993·The Journal of Nutrition·M F Fuller, P Garthwaite
Dec 6, 2005·Proceedings of the National Academy of Sciences of the United States of America·David H Baker

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