The Influence of Layer Flock Age on Egg Component Yields and Solids Content

Fletcher, D. L.; Britton, W. M.; Rahn, Allan P.; Savage, Stanley I.

doi:10.3382/ps.0600983

Cited by 68 publications

(34 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…According Silversides et al (1993Silversides et al ( , 1994, the Haugh unit of eggs obtained from hens at 26 weeks of age was 88.48±0.44, and at 65 weeks, the value was 77.40±0.44. Pope et al (1960), Cunningham et al (1960), Fletcher et al (1981Fletcher et al ( , 1983 and Belyavin (1988) are unanimous on Haugh unit and age of the hen, and stated the Haugh unit decreases with increasing age. Romanoff & Romanoff (1963), Campos et al (1973) and Fennema (1993) stated that in eggs stored at room temperature or higher temperature, the quality can be preserved provided that the shell is impermeable to carbon dioxide loss.…”

Section: Resultsmentioning

confidence: 99%

“…The Haugh unit value of fresh eggs decreases with increasing age of the hen (Cunningham et al, 1960;Fletcher et al, 1981Fletcher et al, , 1983Silversides et al, 1993;Ramos et al, 2008), and the albumen height decreases as birds age, as well (Carvalho et al, 2003;Ramos et al, 2008). According to Campos & Baião (1975), Sauveur (1993) and Santos (2005), temperature and storage time negatively influence the quality of eggs and significantly reduce the Haugh unit, because of the continuous loss of CO 2 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Egg quality of laying hens in different conditions of storage, ages and housing densities

et al. 2012

View full text Add to dashboard Cite

-The objective of this research was to evaluate the quality of eggs from Dekalb White hens under different temperatures (room temperature, 25 ºC; and refrigeration, 8 ºC), storage times (7, 14 and 21 days), age of birds (35, 40, 45 and 50 weeks) and housing densities (625, 500, 416.6 and 357.14 cm 2 /birds). Haugh unit (HU) values and albumen height of 1,120 eggs from 528 laying hens, randomly allocated to four groups with different population densities were evaluated. The results showed a significant effect on Haugh units, between the time and storage conditions and between the ages of laying hens and storage condition. Eggs stored in refrigeration showed less weight loss and better Haugh unit indices when compared with eggs stored at room temperature. The increased time of storage, regardless of the temperature, caused loss in their quality. According to the results of this study, based on the evaluation of the albumen height, temperature, storage time, density and age of the layers influence the values of Haugh unit.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Egg quality of laying hens in different conditions of storage, ages and housing densities

et al. 2012

View full text Add to dashboard Cite

show abstract

“…MIYOSHI and MITSUMOTO (1994) reported that there are great variations in egg composition among laying flocks. Egg weights were also reported to change greatly with the age of the hen (HURNIK et al, 1977;FLETCHER et al, 1981;HASHICUCHI (1996) clutch terminated by one pause-day in the next day. This laying pattern is similar in both high and low lines, which can produce different egg compositions (MIYOSHI et al, 1996 b).…”

Section: Introductionmentioning

confidence: 99%

Intra-Clutch Changes in Egg Composition and Shell Quality in Laying Hens.

et al. 1997

View full text Add to dashboard Cite

Intra-clutch changes in egg composition and shell quality were examined using two laying hen strains (High line: 40 hens, Low line: 39 hens) which were developed by a divergent selection for yolk-albumen ratio. Oviposition time was recorded every 30 minutes from 5: 30 to 18: 30 for a duration of 90 days at about 270 days of age. The eggs of individual hens were collected every day from three consecutive clutches.Only the hens that formed the clutches determined apparently by their oviposition time were used for the analyses.Statistical analyses were performed separately for the four clutch size groups.The lag in oviposition time was the longest for the last egg of the clutch (terminal egg). There was no difference in the oviposition interval between lines. The changes in egg weight of consecutive eggs within a clutch showed that the first egg of the clutch was the heaviest and then the weight gradually decreased.The decrease in weight the low line was estimated to be 3.0-4.0g, or 6% of the 1st egg, while the decrease in weight in the high line was 1.5-2.0g (4% of the first egg). The yolk weight of the 2nd egg was heavier than that of other eggs in the same clutch, and decreased by 1.0-1.5g in both lines. Albumen weight showed a remarkable decrease from the first egg to the 3rd or the 4th eggs of the clutch, then the decrease tended to be smaller.The decrease in the low line, which had a larger amount of albumen, was estimated to be larger.Thick albumen weight tended to decrease as the serial number within a clutch increased.However, thin albumen weight increased slightly in eggs laid at later positions of the clutch.Egg-shell weight, thickness and strength showed a clear increase in the terminal egg of the clutch.(Jpn. Poult. Sci., 34: 273-281, 1997)

show abstract

“…It is well known that egg weight increases with hen age, reaching a plateau by the end of the laying cycle (Weatherup & Foster, 1980). Hen age also affects the proportion of yolk, albumen and eggshell (Fletcher et al, 1981;Akbar et al, 1983;Danilov, 2000). The egg specific gravity and eggshell thickness decrease with advancing breeder age.…”

Section: Introductionmentioning

confidence: 99%

Egg traits and physiological neonatal chick parameters from broiler breeder at different ages

Luquetti

Gonzáles

Bruno

et al. 2004

Rev. Bras. Cienc. Avic.

View full text Add to dashboard Cite

This investigation was carried out to study egg traits (weight, specific gravity and eggshell thickness), and neonatal chick parameters (weight, blood, cardiac and lung parameters) from breeder at different ages. After hatching, neonatal chicks, male and female, from broiler breeder at three different ages (30, 45 and 60 weeks) were sacrificed and blood (red blood cell number, hematocrit, mean cell volume, blood viscosity, and haemoglobin), cardiac (right ventricle and total ventricle weights, cardiac index) and lung (mean pulmonary pressure, fresh relative lung weight) parameters were measured. No significant differences in eggshell thickness or specific gravity were observed in eggs from the three different breeder age. The incubated eggs and neonatal chicks showed heavier absolute weights with increasing breeder age. Broiler breeder age did not affect blood parameters or cardiac index, but affected right ventricle and total ventricle absolute weights. Red blood cell number and hematocrit were higher and lung weight and lung weight:chick weight index were lower for female neonatal chicks. The findings of this study revealed that breeder age affects neonatal chick parameters such as body weight, heart and lung absolute weights, but not blood parameters.

show abstract

The Influence of Layer Flock Age on Egg Component Yields and Solids Content

Cited by 68 publications

References 13 publications

Egg quality of laying hens in different conditions of storage, ages and housing densities

Egg quality of laying hens in different conditions of storage, ages and housing densities

Intra-Clutch Changes in Egg Composition and Shell Quality in Laying Hens.

Egg traits and physiological neonatal chick parameters from broiler breeder at different ages

Contact Info

Product

Resources

About