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Unformatted text preview: In response to physiological control, melanosomes move through the dentrites of the cell and into the feather creating feather colors. Melanocyte stimulating hormone – produced by the intermediate lobe of the pituitary in mammals, but birds lack this portion of the gland. Recently has been found that MSH is produced by the brain and eye of the bird. Drives the production and deposition of melanin in mammals – likely a similar influence in birds. Factors that contribute to melanin coloration: 1. Diet – intake of amino acids such as tyrosine and phenylalanine influence melanin coloration 2. Hormones Testosterone – generally testosterone increases degree and area of melanin coloration Estrogen – treatment of sexually mature males inhibits melanin coloration and produces female-like coloration. 3. Genetics...
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This note was uploaded on 04/08/2011 for the course POUL 3123 taught by Professor Navara during the Spring '09 term at UGA.
- Spring '09