PMID: 11327664May 1, 2001Paper

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

The Journal of Small Animal Practice
S YuJ G Morris

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. The requirement appears to be greater than a combination of 4.5 g tyrosine plus 12 g phenylalanine/kg diet but less than 24 g phenylalanine alone/kg diet.

References

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Sep 1, 1995·The Journal of Investigative Dermatology·H OzekiT Hirobe
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Citations

Jun 22, 2014·The Veterinary Clinics of North America. Small Animal Practice·Cecilia Villaverde, Andrea J Fascetti
Aug 21, 2013·Journal of Veterinary Internal Medicine·B R SabatinoC A Kirk
Jan 30, 2015·Biological Reviews of the Cambridge Philosophical Society·Alexandre Roulin
Mar 24, 2017·PloS One·Bruce C McGorumR Scott Pirie
Jun 15, 2017·Journal of Veterinary Internal Medicine·V J CrossleyH M Syme
May 15, 2004·American Journal of Veterinary Research·Peter J DickinsonRichard A LeCouteur
Oct 21, 2004·Cancer Investigation·Prahlad Parajuli, Andrew E Sloan
Jul 5, 2002·The Journal of Nutrition·Peter J B AndersonJames G Morris
Feb 4, 2003·Science·Geoffrey E Hill, Kevin J McGraw

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