Gwendoline Voilque Shen, Y. B., Voilque, G., Odle, J., & Kim, S. W. (2012). Dietary L-tryptophan supplementation with reduced large neutral amino acids enhances feed efficiency and decreases stress hormone secretion in nursery pigs under social-mixing stress. Journal of Nutrition, 142(8), 1540–1546. https://doi.org/10.3945/jn.112.163824 Shen, Y. B., Voilque, G., Kim, J. D., Odle, J., & Kim, S. W. (2012). Effects of increasing tryptophan intake on growth and physiological changes in nursery pigs. Journal of Animal Science, 90(7), 2264–2275. https://doi.org/10.2527/jas.2011-4203