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Effect of low levels of dietary tyrosine on the hair colour of cats

2001; Wiley; Volume: 42; Issue: 4 Linguagem: Inglês

10.1111/j.1748-5827.2001.tb01798.x

1748-5827

Sue Yu, Quinton R. Rogers, J. G. Morris,

Olfactory and Sensory Function Studies

Journal of Small Animal PracticeVolume 42, Issue 4 p. 176-180 Effect of low levels of dietary tyrosine on the hair colour of cats S. Yu, S. Yu Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, CA 95616, USASearch for more papers by this authorQ. R. Rogers, Q. R. Rogers Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, CA 95616, USASearch for more papers by this authorJ. G. Morris, Corresponding Author J. G. Morris Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, CA 95616, USACorrespondence to J. G. MorrisSearch for more papers by this author S. Yu, S. Yu Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, CA 95616, USASearch for more papers by this authorQ. R. Rogers, Q. R. Rogers Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, CA 95616, USASearch for more papers by this authorJ. G. Morris, Corresponding Author J. G. Morris Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, CA 95616, USACorrespondence to J. G. MorrisSearch for more papers by this author First published: 01 April 2001 https://doi.org/10.1111/j.1748-5827.2001.tb01798.xCitations: 29AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Experiments were conducted to investigate the basis for the change in hair colour of black cats to reddish-brown. Black cats were given purified diets based on gelatin, casein plus lactalbumin, or crystalline amino acids as protein sources. Diets that caused the colour of hair to change to reddish-brown were associated with a reduction in melanin in hair (observed by direct microscopic examination), a decreased total melanin concentration and low concentrations of tyrosine in plasma. Reddish hair coat was induced in black kittens born to queens given a tyrosine-deficient diet during pregnancy. Black hair colour was maintained or restored by diets containing a high concentration of tyrosine or phenylalanine. Current dietary recommendations for dietary tyrosine and phenylalanine for cats are below those required to support maximal melanin synthesis in black cats. 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