Acute Depigmentation of Fertile Brown Eggs in a Commercial Layer Operation

Charlton, B. R.; Tiwary, Asheesh K.; Bickford, A. A.; Filigenzi, Mike S.

doi:10.1177/104063870501700315

Cited by 3 publications

(3 citation statements)

References 9 publications

(21 reference statements)

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“…Avian diseases such as infectious bronchitis and Newcastle disease may cause eggshell thinning, which may subsequently affect eggshell color (Charlton et al, 2005). Medications, such as nicarbazin, may inhibit or discolor brown eggshells (Charlton et al, 2005). While the actual color of the eggshell is a genetic factor, it is suggested that eggshell discoloration is also genetically linked.…”

Section: Introductionmentioning

confidence: 98%

“…The effect of eggshell color has also been extensively evaluated as a means of determining egg quality in broiler breeders (Joseph et al, 1999), which are also predominately brown egg layers. In addition, eggshell color may also be an indicator in the health and stress status of layers (Charlton et al, 2005;Mertens et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…The underlying cause of discoloration or tinting in white eggshells is still unknown, but several factors have been implicated, such as age, stress, medication, diet, and disease (Butcher and Miles, 1995). Avian diseases such as infectious bronchitis and Newcastle disease may cause eggshell thinning, which may subsequently affect eggshell color (Charlton et al, 2005). Medications, such as nicarbazin, may inhibit or discolor brown eggshells (Charlton et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Production characteristics of Hy-Line W36 laying hens hatched from white and tinted eggs

et al. 2014

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Eggshell color can greatly influence visual appeal of table eggs, and within the United States, table eggs are normally sorted and marked according to eggshell color to maximize consumer appeal. Recently, table egg producers have noted increased incidence of "off-color" or tinted (TT) eggs derived from white egg laying breeder hens. Therefore, the objectives of this study were to determine the production characteristics and resultant eggshell color of laying hens hatched from different colored eggs. Hy-Line W36 eggs were obtained from a commercial breeder operation and eggshell color was assessed with a colorimeter to separate eggs into groups of tinted (TT) and nontinted (NT) eggs before incubation. Treatment groups were placed into separate hatching trays. At hatching, chicks from each treatment group were individually wing-banded. Pullets were randomly allocated into cages according to treatment groups at 18 wk. Birds were placed into individual cages, with 5 consecutive cages representing a treatment replicate. Each treatment was replicated 24 times for a total of 120 birds per treatment and fed a nutritionally complete layer diet. Production performance was evaluated from 18 to 34 wk of age. Average weekly egg production was calculated. Feed intake, egg weights, egg mass, feed conversion ratio, and egg color were analyzed every 2 wk. Birds were weighed every 4 wk until completion of the study. Birds hatched from TT eggs had significantly increased BW throughout the experimental period. Hen-day egg production was significantly different when compared with the NT treatment at 19 and 20 wk of age. Eggshell color was also found to be significantly different for the NT and TT groups with TT eggs being significantly further from true white. Selection of progeny based on eggshell color may be a criterion for selecting white egg layers as layers hatched from TT eggs resulted in more off-color eggs, which may affect consumer acceptance for buying white table eggs.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Production characteristics of Hy-Line W36 laying hens hatched from white and tinted eggs

et al. 2014

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Coccidiosis in Egg Laying Poultry

Chapman

2017

Egg Innovations and Strategies for Improvements

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The location of protoporphyrin in the eggshell of brown-shelled eggs

Samiullah

Roberts

2013

Poultry Science

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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.

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Acute Depigmentation of Fertile Brown Eggs in a Commercial Layer Operation

Cited by 3 publications

References 9 publications

Production characteristics of Hy-Line W36 laying hens hatched from white and tinted eggs

Production characteristics of Hy-Line W36 laying hens hatched from white and tinted eggs

Coccidiosis in Egg Laying Poultry

The location of protoporphyrin in the eggshell of brown-shelled eggs

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