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Animals 2012, 2(1), 76-84;

The Interaction Between Dietary Valine and Tryptophan Content and Their Effect on the Performance of Piglets

Animal Sciences Unit, Institute for Agricultural and Fisheries Research (ILVO), Scheldeweg 68, 9090 Melle, Belgium
Received: 4 January 2012 / Revised: 17 February 2012 / Accepted: 20 February 2012 / Published: 22 February 2012
(This article belongs to the Special Issue Monogastric Animal Nutrition and Metabolism)
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Simple Summary

To optimize animal performance, pig diets need the right amount of all essential amino acids. Usually, the ideal amino acid profile is used: If the dietary concentration of one particular amino acid is too low, other amino acids will not be used efficiently. In this experiment it was shown that amino acids that stimulate the feed intake may improve the performance of pigs, even if other amino acids are not at the optimal level.


Four experimental diets for newly weaned pigs were formulated: (1) low valine and low tryptophan; (2) low valine and high tryptophan; (3) high valine and low tryptophan and (4) high valine and high tryptophan. Dietary standardized ileal digestible (SID) lysine content was 1.06 g/kg. The SID valine to SID lysine ratio was 0.58 and 0.67 for the low and high valine diets, respectively, and SID tryptophan to SID lysine ratios were 0.19 and 0.22 for the low and high tryptophan diets, respectively. In total, 64 pens of 6 pigs (3 barrows and 3 gilts) were divided over the four experimental treatments. No interaction between dietary supply of valine and tryptophan was observed (P > 0.1 for all parameters). Increasing the dietary valine content increased the daily feed intake, daily gain and gain:feed (P < 0.001 for all three parameters). Increasing the dietary tryptophan content improved gain:feed during the first 2 weeks (P < 0.05) and overall (P < 0.05). Valine supply had a greater effect on performance results than tryptophan supply. It may thus be beneficial to provide a diet with an optimal dietary concentration of valine even if other amino acids are at suboptimal dietary levels. View Full-Text
Keywords: feed intake; performance; piglet; tryptophan; valine feed intake; performance; piglet; tryptophan; valine
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Millet, S. The Interaction Between Dietary Valine and Tryptophan Content and Their Effect on the Performance of Piglets. Animals 2012, 2, 76-84.

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