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Type: Journal article
Title: The location of protoporphyrin in the eggshell of brown-shelled eggs
Author: Samiullah, S.
Roberts, J.
Citation: Poultry Science, 2013; 92(10):2783-2788
Publisher: Poultry Science Association
Issue Date: 2013
ISSN: 0032-5791
Statement of
S. Samiullah and J. R. Roberts
Abstract: Protoporphyrin has been identified as the main eggshell pigment in brown-shelled eggs. However, there has been some uncertainty concerning the distribution of the pigment within the shell (and cuticle) in brown-shelled eggs. Most previous studies have suggested that the bulk of the shell pigment is deposited in the cuticle of the shell. The present study measured the levels of protoporphyrin in intact eggshells and in shells from which the cuticle had been removed, using eggs from flocks at 3 different ages. This enabled the calculation of the relative amount of protoporphyrin in the calcareous eggshell and the cuticle layer of the eggshell. The majority of the protoporphyrin pigment was located in the calcareous part of the eggshell (80-87%) with a minority contained within the cuticle (13-20%). These findings suggest that studies focused on maintenance of shell color in brown-shelled eggs need to consider the stage of egg formation at which the reduction in pigment deposition is occurring.
Keywords: Laying hen; eggshell; eggshell pigment; shell color; protoporphyrin
Rights: © 2013 Poultry Science Association Inc.
DOI: 10.3382/ps.2013-03051
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Appears in Collections:Animal and Veterinary Sciences publications
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