Analysis of the relations between some physicalindicators of market eggs &nbsp;

The paper discusses the relations between some physical indicators of market eggs of laying hens housed in conventional and enriched cage batteries. The measured results were evaluated by the multiple regression dependence method. They show that in the case of both the conventional as well as the enriched cages a statistically significant dependence exists between the eggshell deflection (dependent variable) and thickness, or the force needed for the eggshell destruction (independent variable). The respective P values are given in brackets (0.002 < 0.05; 0.03 < 0.05; 1.16 × 10–10 < 0.05; 8.31 × 10–4 < 0.05); in the case of the conventional cage and enriched cage also a statistically significant dependence existed (3.81 × 10–91 < 0.05; 3.86 × 10–81; 1.27 × 10–97 < 0.05; 3.46 × 10–57 < 0.05) between the shell weight (dependent variable) and shell thickness, or egg weight (independent variable); in the conventional cage, statistical dependence also occurred between the eggshell weight and egg shape index, (1.07 × 10–6 < 0.05), in the enriched cage this was on the verge of statistical significance (0.062 > 0.05); if in the conventional cage the eggshell thickness was increased by 1 mm, the shell deflection decreased by 0.08 mm,and if the force necessary for the eggshell destruction was increased by 1 N, the shell deflection decreased by 0.0003 mm; if in the conventional cage the shell thickness was increased by 1 mm, the shell weight increasee by 15.509 g and if the egg weight was increased by 1 g, the shell weight increased by 0.061 g. Our work brings further knowledge concerning the monitored characteristics and their mutual relations.

Download Full-text

Certain egg quality parameters of gray guinea fowl in extensive rearing

Biotechnology in Animal Husbandry ◽

10.2298/bah1802207v ◽

2018 ◽

Vol 34 (2) ◽

pp. 207-215

Author(s):

Marinko Vekic ◽

Stoja Jotanovic ◽

Djordje Savic

Keyword(s):

Shell Thickness ◽

Egg Quality ◽

Shape Index ◽

Quality Parameters ◽

Guinea Fowl ◽

Phenotypic Correlation ◽

Shell Weight ◽

Egg Weight ◽

Good Potential

This paper presents results of determination of certain quality parameters and its phenotypic correlation in eggs originated from extensively reared gray variety of Guinea fowl. A total of 150 egg collected by sampling 30 eggs in each of five analyzed laying months were used for egg quality evaluation and statistical analysis by methods of descriptive statistics and simple linear correlation. Average egg weight, shape index and shell thickness was 38.14 g, 76.03% and 0.49 mm, respectively. Average shell, yolk and albumen weight was 5.83, 12.16 and 20.23 g, respectively, and its proportion was 15.23, 32.10 and 52.69%, respectively. Average values of yolk height, diameter, index and color were 16.54 mm, 39.95 mm, 41.50%, and 13.76, whereas values for albumen diameter, index and height as well Haugh units were 59.30 mm, 9.62%, 5.67 mm, and 82.58, respectively. Majority of examined quality parameters showed significant correlation with other parameters. Egg weight was positive correlated (p<0.01) with egg length (0.76) and width (0.92), shape index (0.22), shell thickness (0.60), shell weight (0.81) and proportion (0.44), albumen (0.92) and yolk weight (0.77) and yolk index (0.23), but in negative connection (p<0.01) with yolk proportion (-0.54), yolk/albumen ratio (-0.41) and albumen index (-0.25). Determined egg quality indicated good potential of this species in extensive rearing, which could be improved and used in more favorable rearing conditions.

Download Full-text

Effect Of Length Of Lay Of Nigeria Indigenous Chickens On Their Egg Composition And Shell Quality

Nigerian Journal of Animal Production ◽

10.51791/njap.v19i.2086 ◽

2021 ◽

Vol 19 ◽

pp. 95-100

Author(s):

V. E. Olori ◽

E. B. Sonaiya

Keyword(s):

Surface Area ◽

Shell Thickness ◽

Egg Size ◽

Shape Index ◽

Shell Weight ◽

Egg Weight ◽

Shell Quality ◽

Egg Shape ◽

Egg Composition ◽

Whole Egg

Three hundred and thirty eggs collected from the second to the seventh month of production, from a flock of the Nigeria indigenous (NI) chickens, were analysed to determine the effect of the length of lay on egg composition and shell quality. The weights of the whole egg and its components as well as shell thickness were measured monthly while the proportion of the various components; egg shape index, shell density and shell weight per surface area were calculated. The results showed that egg weight, albumen weight and % albumen increased (P<0.05) with length of lay by 2.6g, 3.5g, 3.5g and 5.6% respectively between 2nd and 7th months. The change in the weight of the yolk, shell and egg shape index was not significant (P>0.05) between the 2nd and 7th months while % yolk, % shell, shell thickness and the shell weight per surface area decreased (P<0.05) by 4.2%, 0.64%, 0.04mm and 0.003g respectively within the same period. Strong phenotypic correlations were observed between the weights of the whole egg and the albumen (r=0.81), shell (r=0.63) and yolk (r=0.46) and also between shell thickness and its weight per surface area (r=0.81). These results indicate that egg size increased as the NI hen advanced in lay. Eggs laid in the 6th and 7th months contained more albumen than those laid earlier and the shell thickness decreased as the hens advanced in lay thus making them more liable to breakage.

Download Full-text

Estimation of Shell Weight and Shell Thickness from Egg Specific Gravity and Egg Weight

Poultry Science ◽

10.3382/ps.0611991 ◽

1982 ◽

Vol 61 (10) ◽

pp. 1991-1995 ◽

Cited By ~ 30

Author(s):

JON O. NORDSTROM ◽

L.E. OUSTERHOUT

Keyword(s):

Specific Gravity ◽

Shell Thickness ◽

Shell Weight ◽

Egg Weight

Download Full-text

Quality of eggs from pasture rearing layers of different genotypes

Biotechnology in Animal Husbandry ◽

10.2298/bah2002181s ◽

2020 ◽

Vol 36 (2) ◽

pp. 181-190

Author(s):

Zdenka Skrbic ◽

Milos Lukic ◽

Veselin Petricevic ◽

Snezana Bogosavljevic-Boskovic ◽

Simeon Rakonjac ◽

...

Keyword(s):

Shell Thickness ◽

Egg Quality ◽

Egg Yolk ◽

Vegetation Period ◽

Shape Index ◽

Quality Parameters ◽

Egg Weight ◽

Naked Neck ◽

Quality Properties ◽

Shell Quality

The comparison of physical quality properties of table eggs of commercial hybrid Tetra SL and two native indigenous breeds of hens, Banat Naked Neck and Svrljig hen, was performed in conditions of alternative production in the pasture system in portable cages without the floor. The experiment was conducted during the vegetation period, at the age of hens of 53-57 weeks. In order to produce good quality eggs, the diet was designed with a complete mixture based on maize and soybean. In addition, constant availability of pastures was ensured. Egg sampling was performed in the morning and the initial egg quality was examined based on egg weight, shape index, egg white, egg yolk and shell quality parameters. Layer hens of the commercial hybrid Tetra SL had significantly higher egg weight and better internal egg quality (p<0.01) compared to hens of Banat Naked Neck and Svrljig hens, except for the colour of the yolk, which was more intense in the same feeding and breeding conditions and the age of laying hens, in eggs of native breeds (p<0.01). Native breeds in relation to the commercial hybrid had lighter shell colour (p<0.01). Deformation and egg shell thickness differed (p<0.01) between all three genotypes. The determined rank of layer hen genotypes for shell thickness was: Tetra SL, Banat Naked Neck, Svrljig hen. However, the breaking force was without statistically confirmed difference between hen genotypes.

Download Full-text

Estimation of the external quality characteristics of goose eggs of known breadth and length

Veterinární Medicína ◽

10.17221/187/2020-vetmed ◽

2021 ◽

Author(s):

O Karabulut

Keyword(s):

Specific Gravity ◽

Shape Index ◽

Quality Characteristics ◽

External Quality ◽

Shell Weight ◽

Egg Weight ◽

Mathematical Formulas ◽

Living Organisms ◽

Egg Shell ◽

Goose Eggs

In this study, we investigated whether the mathematical formulas, which generally reveal the external quality characteristics of living organisms, yield the correct results in goose eggs. For this purpose, three genotypes and 555 eggs were studied that were grouped into Native (n = 356), Chinese (n = 163) and Linda (n = 36), which were raised in Aksaray province. The averages in the Native, Chinese and Linda geese were 5.43, 5.38 and 5.7 cm, respectively, in breadth; were 8.12, 8.03 and 8.67 cm in length, respectively; the shape index was 66.9, 67.2 and 66.7 cm, respectively; the egg volume was 142.8, 138.8 and 172.5 cm3, respectively; the egg surface area was 136.9, 134.3 and 155.4 cm2, respectively; the egg weight was 159.1, 154.5 and 192.3 g, respectively; the specific gravity of the eggs was 1.11, 1.11 and 1.12 g/cm3, respectively; the shell thickness was 0.510, 0.504 and 0.555 mm, respectively; the shell weight was 14.79, 14.32 and 18.26 g, respectively; the shell volume was 70.06, 67.82 and 86.41 cm3, respectively; the shell specific gravity was 2.111 3, 2.111 0 and 2.113 5 g/cm3, respectively; and the shell ratio was 9.29, 9.26 and 9.49 g, respectively. The number of pores is calculated as 14 828, 14 502 and 17 152, respectively. Although the formulas used give compatible results, there is a need for formulas that calculate closer to the truth rather than formulas that calculate the egg weight and egg shell weight.

Download Full-text

Research of selected physical indicators of table eggs in the small-scale breedings from the aspect of health safety

Potravinarstvo Slovak Journal of Food Sciences ◽

10.5219/1357 ◽

2020 ◽

Vol 14 ◽

pp. 893-904

Author(s):

Mária Angelovičová ◽

Michal Angelovič ◽

Lucia Zeleňáková

Keyword(s):

Equatorial Plane ◽

Shell Thickness ◽

Laying Hens ◽

Small Scale ◽

Shell Weight ◽

Egg Weight ◽

Health Safety ◽

Free Range ◽

Shell Damage ◽

Object Of Study

The purpose of this study was to investigate selected indicators of the table eggs in small-scale breedings, focusing mainly on the eggshell and its contamination and damage. Our object of study was eggs, shell, damage, and contamination of table eggs. Four small-scale breedings were randomly selected in Slovakia. These breeds were alternatively with an outdoor free-range. Laying hens Dominant was bred under conditions small-scale breeds No.1, No. 2 and No. 3 in the 1st laying cycle, and No. 4 in the 2nd laying cycle. Egg weight was balanced in three small-scale breedings. Egg weight was significantly higher in the fourth small-scale breeding, statistically significant (p <0.05) compared to egg weight in the studied 3 small-scale breedings. Shell weight and shell thickness in the equatorial plane of the egg were balanced in three small-scale breedings and in the fourth small-scale breedings were significantly higher, statistically significant (p <0.05). The higher egg weight per breeding is related to the higher laying hens age that was in the 2nd laying cycle compared to laying hens 3 small-scale breedings in the 1st laying cycle. Higher eggshell weight in three farms may be related to improved conditions in breeding hygiene, as confirmed by the results of investigations into contamination and damage to table eggs. These differences may also be related to nutrition.

Download Full-text

Impact of Different Rearing Systems and Age on Bovans White Layer’s Performance, Egg Quality Traits and Synthesis of Heat Shock Protein 70 kDa

Annals of Animal Science ◽

10.2478/aoas-2018-0027 ◽

2018 ◽

Vol 18 (4) ◽

pp. 1045-1060 ◽

Cited By ~ 1

Author(s):

Yasin Baykalir ◽

Ulku Gulcihan Simsek

Keyword(s):

Heat Shock Protein 70 ◽

Egg Production ◽

Egg Quality ◽

Shape Index ◽

Quality Traits ◽

Conventional System ◽

Shell Weight ◽

Organic System ◽

Egg Weight ◽

System P

AbstractThis study was conducted to investigate the performance of laying hens and to determine possible age-related changes on external and internal quality traits of their eggs and synthesis of heat shock protein 70 kDa (HSP70) in the conventional cage and organic rearing systems. For this purpose, 4 different Bovans White hybrid flocks of the same age were monitored in each of these two systems for 52 weeks. While a total of 360 eggs were examined to determine the effects of rearing system and age (30 and 60 weeks) on egg quality traits, 48 liver tissue samples were examined for the analysis of HSP70. Egg production (hen-day) and dirty egg ratio were higher in the organic rearing system (P<0.05). The age at 50% yield, the age at peak of lay, and peak production rate were calculated as 156, 218.75 days and 95.98% in the conventional system, and 155.75, 201.50 days, and 96.56% in the organic system, respectively (P>0.05). While egg weight, albumen weight, yolk weight, shell weight, shape index, and yolk colour were higher in the organic system, the crude ash ratio of eggshell and shell ratio were higher in the conventional system (P<0.05). It was also found that the egg weight, albumen weight, yolk weight, shell weight, and the percentage of yolk were higher at 60 weeks of age (P<0.001). The percentage of shell and albumen, shape index, and yolk colour were higher at 30 weeks of age (P<0.001). The interactions between rearing system and age were statistically significant in terms of shell thickness, shape index, crude ash ratio, and yolk colour (P<0.001). Stress protein (HSP70) level was affected only by the rearing system and was higher in the organic system (P<0.001). As a result, the organic system can be considered as advantageous in terms of egg production and quality traits and the eggs of young hens exhibited better properties. The high level of HSP70 in the organic system could indicate that hens were affected by the environmental conditions at higher rates and/or the hens reared in the organic system had a stronger antioxidant defence system.

Download Full-text

Egg quality in different lines of New Hampshire and Giriraja chicken

Bangladesh Journal of Animal Science ◽

10.3329/bjas.v49i2.53219 ◽

2021 ◽

Vol 49 (2) ◽

pp. 108-118

Author(s):

N Baskota ◽

M Sharma ◽

N Bhattrai ◽

D Neupane ◽

RK Yadav ◽

...

Keyword(s):

New Hampshire ◽

Significant Variation ◽

Shell Thickness ◽

Egg Quality ◽

Shape Index ◽

Quality Parameters ◽

Quality Parameter ◽

Egg Weight ◽

Egg Diameter ◽

Better Than

This study was undertaken to evaluate the egg quality parameters of New Hampshire and Giriraja by maintaining four different flocks (lines) of New Hampshire viz. NH-Khajura, NH-Parwanipur, NH-Khumaltar and NH-Pokhara and three different flocks (lines) of Giriraja viz. GR-Pakhribas, GR-Khumaltar and GR-Tarhara. The 40-60 weeks of hatchability, fertility, external and internal egg quality parameters were studied and recorded. A total of 200 birds (40 weeks of age) of each New Hampshire and Giriraja from each line were maintained on deep litter system. Results from this study indicated the significant effect of genotype and respective lines on fertility and hatchability of eggs. Significant (P<0.05) variation in fertility and no significant variation in hatchability for genotypes were found. However, in terms of fertility and hatchability, there were significant variations in different lines. In case of egg weight: no significant (P<0.01) variation was obtained for genotype but lines comparison showed significant variation. Other external egg quality parameters like egg length, egg diameter, shape index, shell thickness were examined for evaluating the genotype and line effect. In all these external egg quality parameters, there were significant (P<0.01) effect of both genotype and lines of birds. For internal egg qualities, yolk weight (g), yolk index, albumen weight and albumen index were checked. Genotype had no significant (P<0.01) effect but lines had significant (P<0.01) effect on yolk weight. In case of yolk index, both genotype and lines of bird had no significant effect. For albumen weight and albumen index, genotype of birds had no significant (P<0.01) effect but lines of bird had significant (P<0.01) effect on both parameters. The study showed that the egg quality parameters of NH (Khajura) were better than that of GR. Among different lines New Hampshire (Khajura) showed better performance in terms of egg quality parameter. Bang. J. Anim. Sci. 2020. 49 (2): 108-118

Download Full-text

EGG QUALITY TRAITS IN WG, GG AND GL JAPANESE QUAIL POPULATIONS

Trakia Journal of Sciences ◽

10.15547/tjs.2019.01.008 ◽

2019 ◽

Vol 17 (1) ◽

pp. 49-55 ◽

Cited By ~ 4

Author(s):

H. Lukanov ◽

A. Genchev ◽

P. Kolev

Keyword(s):

Japanese Quail ◽

Shell Thickness ◽

Egg Quality ◽

Shape Index ◽

Egg Mass ◽

Quality Traits ◽

Egg Weight ◽

Poultry Breeding ◽

Average Shape

The aim of the study was to evaluate egg quality traits in three heavy Japanese quail populations created and reared in the Poultry Breeding Unit of the Trakia University – Bulgaria, marked as WG, GG and GL. In the experiments, 160 female birds from populations WG and GG, and 96 birds from population GL were tested up to the 6th production month. The main egg quality traits were controlled. The highest average egg weight was registered in WG group and the lowest in GL group, 14.04±0.32 g and 12.79±0.29 g respectively (p<0.05). The highest average Shape index was observed in group GG (78.31±0.53%), vs the lowest in WG quails (77.55±0.62%). Albumen proportion is almost 2/3 of egg mass, with average values from 57.14% in group WG tо 59.90% in group GG. Yolk proportion was about 30%, with smaller differences between the groups. The shell share from all tested groups comprised between 10.95 and 12.58% of egg weight. Average shell thickness was the greatest in eggs of WG quails (223.53±5.52 μm), and the lowest – in GG quails (216.91±6.83 μm). Egg quality traits were typical for the meat productive type of Japan quails.

Download Full-text