scholarly journals Changes in egg quality traits associated with long-term selection for lower yolk cholesterol content in Japanese quail

2008 ◽  
Vol 53 (No. 3) ◽  
pp. 119-127 ◽  
Author(s):  
J. Baumgartner ◽  
Z. Končeková ◽  
J. Benková ◽  
D. Peškovičová ◽  
J. Simenovová ◽  
...  
Keyword(s):  
Egg Quality ◽  
Shape Index ◽  
Cholesterol Content ◽  
Quality Traits ◽  
Egg Weight ◽  
Term Selection ◽  
Edible Part ◽  
Selection For ◽  
Yolk Cholesterol

In the present paper we describe the basic results of long-term selection for low yolk cholesterol content in Japanese quail and its influence on development and relationship with other egg quality traits during nineteen selected generations. The changes in a selected low cholesterol line were compared with changes in an unselected control line to obtain the real selection response to estimated traits. There was a significant decrease in yolk cholesterol content from 1 815 mg/100 g of fresh yolk (P generation) to 1 522 mg/100 g yolk (S19 generation). According to the value of regression coefficient <I>b</I> the decrease per one generation was 15.71 mg/100 g yolk. The decrease in cholesterol of the edible part of egg was also effective and it significantly decreased by 11.29 mg/100 g of the edible part of egg in each generation. There were only insignificant changes in egg weight, but we found a significant increase in yolk weight during selected generations. According to the regression analysis the increase in yolk weight was 0.019 mg/100 g per one generation. There were a positive but insignificant increase also in albumen weight, shell weight and weight of the edible part of egg. We found a small and insignificant decrease in shape index. We determined very high and significant positive correlations between cholesterol content in yolk and cholesterol content in the edible part of egg (0.801+++) and significant negative correlations between yolk cholesterol content and egg weight (–0.515+), yolk weight (–0.468+) and weight of the edible part of egg (–0.475). There were only low, positive and insignificant correlations between yolk cholesterol content and yolk egg proportion and egg shape index.

scholarly journals REPEATABILITY OF EGG NUMBER AND EGG QUALITY TRAITS IN COMMERCIAL PULLETS

2021 ◽  
Vol 21 ◽  
pp. 71-75
Author(s):  
J. C. Okonkwo ◽  
S. N. Ibe
Keyword(s):  
Genetic Gain ◽  
Shell Thickness ◽  
Egg Quality ◽  
Shape Index ◽  
Quality Traits ◽  
Egg Weight ◽  
Egg Number ◽  
Selection For ◽  
Haugh Unit

Repeatability estimates of 0.09 for egg number to 30 weeks of age; 0.67, 0.53, 0.51 0.20 and 0.26 for egg weight (EW), shell thickness (ST), Haugh unit (HU), yolk index (YI) and shape index (SI), respectively, at 22 weeks of age; and 0.85, 0.78, 0.82, 0.49 and 0.62 for the same traits, respectively at 30 weeks of age were obtained in a flock of exotic commercial pullets reared in cages. The expected relative genetic gain per generation of selection for repeated records was inversely related to the magnitude of repeatability. Thus, as laying progressed, repeatability estimates became higher and expected genetic gain from using additional records decreased and fewer records were required to characterize the pullets for inherent transmitting ability. While 4 eggs per hen areconsidered adequate for 22 - week EW, ST and HU, 8 eggs are required for YI and ŞI. The considered numbers of eggs for corresponding traits at 30 weeks are 3 and 4, respectively. Measurements on 10 eggs per hen are required for egg number to 30 weeks.

scholarly journals Effects of Ginger Extract on Laying Performance, Egg Quality, and Antioxidant Status of Laying Hens

Animals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 857 ◽  
Author(s):  
Wen ◽  
Gu ◽  
Tao ◽  
Cheng ◽  
Wang ◽  
...  
Keyword(s):  
Antioxidant Status ◽  
Laying Hens ◽  
Egg Quality ◽  
Basal Diet ◽  
Cholesterol Content ◽  
Ginger Extract ◽  
Sod Activity ◽  
Egg Weight ◽  
Laying Performance ◽  
Yolk Cholesterol

The objective of this study was to investigate the effects of ginger extract (GE) as a dietary supplement for laying hens. A total of 40-week-old 288 Hyline Brown laying hens were randomly divided into two groups with six replicates, and fed a basal diet with or without 100 g/t GE for eight weeks. Dietary GE supplementation increased egg weight, albumin height, and Haugh unit of eggs, and decreased yolk cholesterol content and activities of alanine transaminase and aspartate transaminase in serum at eight weeks. Moreover, GE resulted in higher total superoxide dismutase (T-SOD) activity and lower malondialdehyde (MDA) content in yolk at four and eight weeks and in serum. It was concluded that GE was effective in increasing egg weight and improving the egg quality and antioxidant status of laying hens.

CORRELATED RESPONSES IN EGG QUALITY TRAITS TO SELECTION FOR EARLY BODY WEIGHT IN MEAT-TYPE CHICKENS

1972 ◽  
Vol 14 (3) ◽  
pp. 477-482 ◽  
Author(s):  
V. Buvanendran ◽  
E. S. Merritt
Keyword(s):  
Body Weight ◽  
Egg Quality ◽  
Correlated Response ◽  
Quality Traits ◽  
Correlated Responses ◽  
Egg Weight ◽  
Shell Color ◽  
Blood Spots ◽  
Selection For ◽  
Meat Type

The correlated responses in egg quality traits to selection for high early body weight were studied in seven meat-type populations comprising five selected and two control lines. Traits studied were specific gravity, egg weight, albumen height, Haugh units, shell color, egg shape, shell roughness, wrinkling and asymmetry, and incidence of blood spots, meat spots and double yolks. Significant (P < 0.05 or < 0.01) correlated changes, as determined by the regression of correlated response (egg quality traits) on primary response (body weight), were obtained for egg weight, albumen height, Haugh units, asymmetry of shell and blood spots. All but blood spots increased with selection for high body weight. Shell color showed a consistent trend towards a darker color with increasing body weight. Scores for roughness of shell and, with one minor exception, the incidence of double yolks, also showed consistent trends (positive) with increasing body weight. Estimates of genetic correlations, derived directly from intra-line genetic analyses of the six pedigreed populations in the experiment, were in most cases in reasonable agreement with realized estimates.

Effect of long-term selection for increased leanness on meat and eating quality traits in Duroc swine1

2006 ◽  
Vol 84 (6) ◽  
pp. 1577-1583 ◽  
Author(s):  
C. R. Schwab ◽  
T. J. Baas ◽  
K. J. Stalder ◽  
J. W. Mabry
Keyword(s):  
Eating Quality ◽  
Quality Traits ◽  
Term Selection ◽  
Selection For

scholarly journals Influence of strain and production cycle on egg quality traits of two Nigerian indigenous chicken strains

2020 ◽  
Vol 45 (2) ◽  
pp. 29-39
Author(s):  
V. U. Oleforuh-Okoleh ◽  
U. M. Chukwuemeka ◽  
G. O. Adeoye
Keyword(s):  
Egg Quality ◽  
Shape Index ◽  
Internal Quality ◽  
Production Cycle ◽  
Strain Effect ◽  
Quality Traits ◽  
Indigenous Chicken ◽  
Egg Weight ◽  
Naked Neck ◽  
Egg Shape

Records obtained from purebred normal feather and naked neck Nigerian indigenous chicken strains were used to assess the influence of strain and production cycle on external and internal egg quality traits. The assessment commenced from first lay to 120 days of lay, classified into four production cycles (PC): PC1 (1-30 days of lays), PC2 (31-60 days of lays), PC3 (61-90 days of lays), and PC4 (91-120 days of lays). Mean egg weight, length and breadth were 4.34% heavier, 2.10% longer and 1.72% wider in the normal feather than in the naked neck (p<0.05). No disparity due to strain effect was found in egg shape index. Eggshells from the two strains had similar weight but varied in thickness with shells from the naked neck being 0.02mm thicker than those from the normal feather (p<0.05). Eggs from the normal feather were 7.13, 5.76, 5.00, 7.10 and 8.11% superior in albumen weight, yolk height, albumen height, yolk index, and albumen index, respectively compared to its naked neck counterpart (p<0.05). Production cycle significantly influenced all external egg quality studied. An increase of 16.21% in egg weight was obtained by PC4. Egg length and breadth increased consistently with each subsequent PC (p<0.05) whereas egg shape index decreased with PC (p<0.05). Higher values were recorded for yolk weight, yolk and albumen length and width in each subsequent production cycle. Haugh unit, yolk and albumen height had best values at PC2. Our findings indicate that strain type and production cycle highly influenced egg quality traits of Nigerian indigenous chickens with the normal feather showing superiority. Furthermore, the best internal quality was obtained at PC2 (31-60 days of lay). Our findings could be useful in choosing selection criterion traits in breeding plans for the development of different layer lines of normal feather and naked neck.

scholarly journals Effect of Alternative Housing System and Hen Genotype on Egg Quality Characteristics

2018 ◽  
pp. 695 ◽  
Author(s):  
Zofia Sokołowicz ◽  
Józefa Krawczyk ◽  
Magdalena Dykiel
Keyword(s):  
Rhode Island ◽  
Egg Quality ◽  
Egg Yolk ◽  
Shape Index ◽  
Cholesterol Content ◽  
Housing System ◽  
Shell Weight ◽  
Alternative Housing ◽  
Egg Yolks ◽  
Yolk Cholesterol

The aim of the study was to determine the effect of type of alternative housing system and layer genotype on the quality of table eggs. The investigated eggs came from native Greenleg Partridge hens (Z-11) and Rhode Island Red hens (R-11) covered by the gene-pool protection program, as well as from Hy-line Brown commercial hens from litter barn (LS), free range (FR), and organic systems (OS). Eggs for the study were collected from the hens at 56 wk of age. Egg quality assessment was based on the following values egg traits: weight, shape index, yolk, albumen, and shell percentage in the whole egg; eggshell traits: color intensity, weight, thickness, density, breaking strength, physical features of egg content: albumen height, value of Haugh units, yolk color; presence of meat/ blood spots and cholesterol, higher fatty acids, vitamin A and E in egg yolks. In the rearing systems under study, eggs with the highest weight were laid by commercial hens, and the type of alternative rearing system had no significant effect on this trait. Shell colour intensity depends on the breed of hen, whereas the rearing system has no significant effect on this trait. Hen genotype and housing system had an effect on egg shell weight, thickness, and density. The housing system influences the content of MUFA, PUFA, PUFAn-6 and PUFAn-3 as well as PUFA 6/3 in egg yolks. No effect of the housing system on egg yolk cholesterol content was observed.

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

2019 ◽  
Vol 17 (1) ◽  
pp. 49-55 ◽  
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.

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

2018 ◽  
Vol 18 (4) ◽  
pp. 1045-1060 ◽  
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.

scholarly journals The Effect of Genotype and Age of Layer Breeders on Egg Quality Traits

2020 ◽  
Vol 36 (2) ◽  
pp. 228-236
Author(s):  
S. O. Olawumi ◽  
J. T. Ogunlade
Keyword(s):  
Egg Quality ◽  
Shape Index ◽  
Age Effect ◽  
Quality Traits ◽  
Eggshell Thickness ◽  
External Quality ◽  
Egg Weight ◽  
Effect Of Age ◽  
Haugh Unit

The external and internal qualities of 120 eggs (60:60) from Isa Brown (IB) and Bovan Nera (BN) layer breeders were evaluated at 15th and 30th week of their production. The genotypes differed significantly (P<0.09) m external egg quality traits except egg weight and egg length. IB recorded higher values in egg width, eggshell weight, eggshell thickness, shape index and shell ratio than BN, while the reverse trend was for egg length. This implies that IB genotype produced eggs with thicker shells than BN, which invariably will lead to a reduction in the rate of cracks and leakages both on the farm and in the hatchery thereby enhancing better hatchability. The age effect was significant (P<0.05) for all the external egg quality traits. The analysis showed that eggs produced at 30th week were better in terms of external quality traits with the exception of egg shape index. There was positive and significant (P <0.05) interaction effect between genotype and age on eggshell width and shell ratio but not for other traits. As regards internal egg quality traits, the genotypes differed significantly (P<0.05) in all the traits except yolk width, yolk height and albumen weight. IB recorded higher (P<0.05) values in yolk weight, albumen width and yolk ratio than BN, while the latter recorded higher values in albumen height, albumen ratio and haugh unit (HU) than the former The effect of age on internal traits was positive and significant (P<0.05) with the exception f yolk width, albumen width, yolk ratio and albumen ratio. The result showed that the 30th week analyses recorded higher (P<0.05) values in these traits than 15th week. This implies that the quality of breeding eggs improves with the advancing age of the birds. Breed x age interactions were significant for yolk weight and albumen width but not found for other traits. IB genotype was considered the best for external egg quality traits and produced thicker eggshell. However, BN genotype produced superior egg quality than lB having recorded higher values (P< 0.05) in HU, which is a determinant of egg quality

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