Melanins Part III

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DERECHOS RESERVADOS

Text Box: Dispersed melanin - manifestation of melanin which forms a veil like effect over the lipochrome making it darker and altering the visual ground color.

AVIARIO PUERTO RICO

CARLOS DÁVILA

Text Box: SQUEMACHROME The green color is a visual effect produced by the dispersed melanin over the yellow lipochrome

Text Box: FERTILIZATION - as long as copulation occurs at least 24 hours before the first egg is laid the probabilities for fertilization are good. The canary hen has the ability to store viable spermatozoa for a number of days. Once the ovule has been fertilized cellular division and growth begins, later these cells segregate to form groups of cells with very specific functions. Once the egg is laid cellular division is interrupted until the hen starts her incubation period which usually lasts up to 14 days.

Text Box: At the end of the first incubation day the embryo is practically complete. The neural crest is formed from which the different groups of cells will form and migrate and later go through the differentiation process to form all the organs and systems, the melanization process initiates. After various days of incubation the Melanoblasts (precursors of melanocytes) migrate from the neural crest to form a pattern of migration which is genetically controlled and determines the concentration and localization of the melanocytes.