Shell Egg Quality and Preservation

Zeidler, Gideon

doi:10.1007/978-1-4615-0811-3_60

Cited by 22 publications

(21 citation statements)

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“…The HW hens showed higher percentages (p < 0.01) than those of purebreds throughout the overall production period and they showed more double-yolk eggs (p < 0.01) than HB only at I age. This defect is of physiological origin and the hormonal status can affect the ovulation rate in particular at the beginning or at the end of the laying activity according to the genotype and the interaction with lighting [21,33]. The hybrids, selected for an intense oviposition rate, showed similar values and trends from 33-36 weeks, and exhibited an increasing differentiation from the purebreds, with percentages 4-5 times higher.…”

Section: Egg Defects Of Behavioural and Physiological Originmentioning

confidence: 99%

“…Relevant aspects to investigate on the egg production of purebred and hybrid genotypes under outdoor rearing conditions is the percentage of defective eggs from those suitable for retail, as stated above. For the intensively reared layer hybrid strains, the percentages of defective eggs throughout the laying period and their main causes are known [21][22][23][24]. Little is known about laying behaviour and damaged eggs of dual-purpose hybrids [17,25] and purebred hens reared under outdoor conditions [5].…”

Section: Egg Defects Of Behavioural and Physiological Originmentioning

confidence: 99%

“…These results are mainly due to the physiology of reproduction of the hens: at ovulation the rupture of the ovarian follicle at an area different from stigma and residues of the activity of the oviduct for the albumen synthesis can generate blood and meat spots in particular in genotypes with a genetic asset originally not addressed to a high laying activity [21,32]. (30,30,22,30); RM (25,16,21,24); HB (30,30,22,30); HW (30,30,22,30). (30,30,22,30); RM (25,16,21,24); HB (30,30,22,30); HW (30,30,22,30).…”

Section: Internal Traits Of the Eggsmentioning

confidence: 99%

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Yield Performance, Laying Behaviour Traits and Egg Quality of Purebred and Hybrid Hens Reared under Outdoor Conditions

Rizzi

2020

Animals

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This study compared the yield performance, laying behavioural traits and egg quality of purebred and hybrid hens (from 28 until 44 weeks of age, considering four periods) reared under outdoor conditions. The four genotypes were reared on the same trial station, on four areas (one genotype/area), and under the same environmental conditions from hatching until the end of the trial. Italian dual-purpose purebred (Ermellinata di Rovigo—ER and Robusta maculata—RM) and hybrid (Hy-Line Brown—HB and Hy-Line White 36—HW) hens (flock size: 70 birds/genotype) were allowed outdoors (4 m2/bird, good pasture during the growing period and poor pasture throughout the laying period, according to the season) and indoors (0.20 m2/bird, five birds/individual nest) and fed commercial feed. Significant (p < 0.01) differences among genotypes were found. The hybrids showed a higher laying rate and hen-day edible egg mass, and a lower body weight than the purebreds. Broken and out-of-nest egg% were higher in RM and HW than ER and HB, respectively. Double-yolk egg% was higher in hybrids than in purebreds. The eggshell colour varied among brown eggshell ER, RM, and HB. The ER showed the lowest shape index. With aging, the yolk to albumen ratio linearly increased in all groups, eggshell% changed in ER, HW, RM (cubic) and in HB (linear). The purebreds showed meat spots% higher than blood spots; HW showed the lowest total inclusion%. In conclusion, according to an egg scoring evaluation (egg weight = medium-large size, yolk to albumen ratio = 0.5, total inclusions = none), HW showed a higher quality than HB and RM, and ER was intermediate. The RM hens showed the highest% of defective eggs, especially for overcrowding at nest, HB showed the lowest. Under outdoor conditions the laying behaviour of the purebred hens and the nest management are important factors for the saleable egg rate.

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Section: Egg Defects Of Behavioural and Physiological Originmentioning

confidence: 99%

Section: Egg Defects Of Behavioural and Physiological Originmentioning

confidence: 99%

Section: Internal Traits Of the Eggsmentioning

confidence: 99%

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Yield Performance, Laying Behaviour Traits and Egg Quality of Purebred and Hybrid Hens Reared under Outdoor Conditions

Rizzi

2020

Animals

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“…A number of factors such as genetics, feed quality, environment and age are involved in eggshell formation and quality (Butcher, 1996). About 10% of all eggs produced are cracked or broken between laying and retail sale (Zeidler, 2001). The cause of this breakage is usually a combination of factors.…”

Section: Introductionmentioning

confidence: 99%

Dietary arginine silicate inositol complex during the late laying period of quail at different environmental temperatures

Onderci

Şahin

et al. 2006

British Poultry Science

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Arginine silicate inositol complex (ASIdagger; arginine 49.5%, silicon 8.2%, inositol 25%) is a novel material which is a bioavailable source of silicon and arginine. ASI offers potential benefits for vascular and bone health. Poor eggshell quality has been a major economic concern to commercial egg producers. Poor egg quality, skeletal abnormalities and architectural deterioration of bone tissue are common problems under hot conditions and in older birds. The effects of ASI supplementation on egg production, egg quality, levels of osteocalcin (OC) and bone mineral content were investigated in heat-stressed Japanese quail during the later part of the laying period. The birds were randomly assigned to six treatment groups consisting of six replicates of five birds each in a 2 x 3 factorial arrangement of treatments (temperatures, ASI levels). The birds were kept in wire cages in a temperature-controlled room at either 22 degrees C (TN) or 34 degrees C (HS) for 8 h/d and fed either a basal (control) diet or the basal diet supplemented with either 500 or 1000 g of ASI/kg. Heat exposure reduced egg production, egg quality and bone mineralisation when the basal diet was fed. ASI supplementation had no effect on feed intake or egg production under TN or HS conditions. However, ASI supplementation increased egg weight, shell thickness, shell weight and Haugh unit in both TN and HS groups during the late laying period. Bone mineral density (BMD) was significantly improved by ASI supplementation in both TN and HS groups. Serum osteocalcin (OC) concentrations and alkaline phosphatase (ALP) activity increased linearly with dietary ASI supplementation during the late laying period. The amount of calcium and phosphorus in the excreta decreased, while ash, mineral content, calcium and phosphorus concentrations in tibia increased in ASI-supplemented quail in both TN and HS groups during the late laying period. ASI supplementation significantly improved egg quality and bone mineralisation in quail during the late laying period and did not affect feed consumption or egg production.

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“…The Haugh unit (HU) is an expression that measures the albumen quality of eggs. The higher the HU the better the albumen quality of eggs (Stadelman, 1995a; Zeidler, 2002). anova results indicated that the three main effects (storage periods, coating treatments, and initial albumen qualities) and their interactions were all significant ( P < 0.05).…”

Section: Resultsmentioning

confidence: 99%

Effects of initial albumen quality and mineral oil–chitosan emulsion coating on internal quality and shelf‐life of eggs during room temperature storage

Torrico

Sriwattana

et al. 2011

Int J of Food Sci Tech

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Effects of mineral oil (MO) and mineral oil-chitosan emulsion (MO:CH = 25:75) as coatings on internal quality and shelf-life of eggs were evaluated during 5-week storage at 25°C. Eggs with three different initial albumen qualities [Haugh unit (HU): H = 87.8, M = 75.6 and L = 70.9] were evaluated. As storage time increased, HU and yolk index values decreased whereas weight loss increased. Coating with MO and ⁄ or 25:75 MO:CH emulsion could preserve the internal quality for at least 4 more weeks for H-eggs and at least 3 more weeks for M and ⁄ or L-eggs, all with weight losses <0.92%. All coated eggs had >70% positive purchase intent, and their colour differences at week 0 could not be detected by naked human eye (DE * < 3.0, noncoated eggs as reference). Consumers significantly differentiated freshly MO-coated from noncoated eggs on overall surface appearance. This study demonstrated that MO and 25:75 MO:CH emulsion coatings could preserve internal quality and prolong shelf-life of eggs.

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Shell Egg Quality and Preservation

Cited by 22 publications

References 0 publications

Yield Performance, Laying Behaviour Traits and Egg Quality of Purebred and Hybrid Hens Reared under Outdoor Conditions

Yield Performance, Laying Behaviour Traits and Egg Quality of Purebred and Hybrid Hens Reared under Outdoor Conditions

Dietary arginine silicate inositol complex during the late laying period of quail at different environmental temperatures

Effects of initial albumen quality and mineral oil–chitosan emulsion coating on internal quality and shelf‐life of eggs during room temperature storage

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