The Haugh Unit as a Measure of Egg Albumen Quality

Eisen, E. J.; Bohren, B. B.; McKean, H. E.

doi:10.3382/ps.0411461

Cited by 275 publications

(144 citation statements)

References 3 publications

Supporting

Mentioning

130

Contrasting

Unclassified

Order By: Relevance

“…Also, a random sample of 30 eggs from each treatment was collected every four weeks to measure egg quality such as eggshell thickness, eggshell strength, specific gravity, Hough unit (HU), yolk colour score and eggshell weight. The HU was calculated using the formula of Eisen et al (1962) based on the height of albumen determined by a micrometer and egg weight. The specific gravity of an egg was determined by using the saline flotation method of Hempe et al (1988).…”

Section: Methodsmentioning

confidence: 99%

The effect of dietary inclusion of meat and bone meal on the performance of laying hens at old age

Bozkurt¹,

Alçiçek

Çabuk³

2004

SA J. An. Sci.

View full text Add to dashboard Cite

The effect of the inclusion of meat and bone meal (MBM) in the diet of old laying hens on their egg production and the quality of their eggs was investigated. Meat and bone meal containing a high concentration of ash and a low concentration of crude protein was included at levels of 2.0, 4.0 and 6.0% in the diets and fed for 20 weeks. Forced moulted 84-week old laying hens (Brown-Nick) were divided randomly into four treatment groups of 120 hens each. The inclusion of 2.0% MBM to the layer diet increased hen-day egg production significantly, whereas inclusion in excess of 2.0% MBM had no additional beneficial effect on egg production. However, the inclusion of dietary MBM at all three levels depressed egg weight. There were no significant effects of dietary treatments on egg weight, feed intake and feed conversion ratio of the hens. The specific gravity of the eggs from hens fed the control diet was significantly lower than from those receiving the diets containing 2.0 and 4.0% MBM. The Haugh Unit value of eggs in the 6.0% MBM treatment was significantly higher than the other treatments. There were no significant effects of MBM inclusion on yolk colour score, yolk height, eggshell thickness, eggshell weight and eggshell strength. However, MBM inclusion in a diet had a significant beneficial effect on eggshell quality. The eggshell ratios of the 2.0, 4.0 and 6.0% MBM treatments were significantly higher than in the control diet, while the cracked/broken egg ratio was significantly lower. In conclusion, inclusion of MBM containing a high ash and low crude protein content to conventional maize-soya bean diet improved egg production performance of laying hens. The dicalcium phosphate level in the diet could also be reduced without any adverse effects on egg production and egg quality.

show abstract

Section: Methodsmentioning

confidence: 99%

The effect of dietary inclusion of meat and bone meal on the performance of laying hens at old age

Bozkurt¹,

Alçiçek

Çabuk³

2004

SA J. An. Sci.

View full text Add to dashboard Cite

show abstract

“…Egg weight usually depends on hen age and to nutritional factors. Eisen et al (1962) had already mentioned that egg size increases as hens age.…”

Section: The Use Of Light-emitting Diodes (Led) In Commercial Layer Pmentioning

confidence: 99%

The use of light-emitting diodes (LED) in commercial layer production

Borille¹,

Garcia²,

Royer³

et al. 2013

Rev. Bras. Cienc. Avic.

View full text Add to dashboard Cite

Artificial lighting is one of the most powerful management tools available to commercial layer producers. Artificial light allows anticipating or delaying the beginning of lay, improving egg production, and optimizing feed efficiency. This study aimed at comparing the performance of commercial layers submitted to lighting using different LED colors or conventional incandescent lamps. The study was carried out in a layer house divided in isolated environments in order to prevent any influenced from the neighboring treatments. In total, 360 Isa Brown layers, with an initial age of 56 weeks, were used. The following light sources were used: blue LED, yellow LED, green LED, red LED, white LED, and 40W incandescent light. Birds in all treatment were submitted to a 17-h continuous lighting program, and were fed a corn and soybean meal-based diet. A completely randomized experimental design with subplots was applied, with 24 treatments (six light sources and four periods) of three replicates. Egg production (%) was significantly different (p<0.05) among treatments, with the best results obtained with red LED, white LED, and incandescent light sources. Egg weight, feed intake, and internal egg quality (albumen height, specific gravity, and Haugh units) were not influenced (p>0.05) by light source. It was concluded that the replacement of incandescent light bulbs by white and red LEDs does not cause any negative effect on the egg production of commercial layers.

show abstract

“…Haugh unit, an indicator of egg albumen quality, was calculated using the following formula: Haugh unit = 100 × log (H + 7.57 − 1.7 × W 0.37 ), where H = albumen height (mm) and W = egg weight (g) (Eisen et al 1962). The colour evaluation of the egg yolks were performed by using the Roche colour scale.…”

Section: Performance and Egg Qualitymentioning

confidence: 99%

Effects of grape pomace supplementation to laying hen diet on performance, egg quality, egg lipid peroxidation and some biochemical parameters

Kara

Güçlü

Baytok

et al. 2015

Journal of Applied Animal Research

View full text Add to dashboard Cite

This study was carried out to determine the effects of dried grape pomace supplementation in a corn-soy-based diet on performance, egg quality, plasma and egg lipid peroxidation, and some biochemical parameters of laying hens. In this study, 96 moulted 80-week-old Bovans laying hens were distributed into three groups with eight replicates. The hens were fed a supplemented diet with 0% (control group), 4% and 6% grape pomace (experimental groups) for 12 weeks. In the study, the effects of grape pomace supplementation in a corn-soy-based diet on performance, internal and external egg quality, serum total cholesterol, total protein, glucose and triglyceride levels, and plasma and egg yolk malondialdehyde (MDA) levels were determined. The addition of grape pomace to laying hen diet did not significantly affect live weight, feed intake, egg production and feed efficiency (P > 0.05). In all treatment groups, supplementation did not significantly affect albumen index, Haugh unit, egg yolk index, yolk colour, eggshell ratio, eggshell thickness, egg-specific gravity, total cholesterol, total protein and triglyceride compared to the control group (P > 0.05). In the study, 4% grape pomace supplementation to diet significantly increased egg weight (P < 0.001), and both 4% and 6% grape pomace supplementation levels significantly increased liver weight (P < 0.05) and liver weight ratio (P < 0.01). Grape pomace addition to laying hens diet significantly decreased plasma MDA and serum glucose levels (P < 0.001). Also, grape pomace addition significantly decreased egg yolk MDA levels on day 1 (incubation on 0 minute; P < 0.001), and day 15 [incubation on 0, 30, 60 and 90 (P < 0.05) minutes]. The results of this study concluded that performance, egg quality and serum total cholesterol, total protein and triglyceride levels were not negatively affected. Plasma and egg yolk MDA, and serum glucose levels were reduced by 4% and 6% supplementation to laying hen diets. It was concluded that grape pomace supplementation has the potential to extend shelf life.

show abstract

The Haugh Unit as a Measure of Egg Albumen Quality

Cited by 275 publications

References 3 publications

The effect of dietary inclusion of meat and bone meal on the performance of laying hens at old age

The effect of dietary inclusion of meat and bone meal on the performance of laying hens at old age

The use of light-emitting diodes (LED) in commercial layer production

Effects of grape pomace supplementation to laying hen diet on performance, egg quality, egg lipid peroxidation and some biochemical parameters

Contact Info

Product

Resources

About