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Effect of storage period and conditions on
egg quality of some poultry strains
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Abstract: There were several fundamental changes take place during storage of eggs. These changes includes some loss weight, and changes in specific gravity of, yolk weight, yolk index and yolk color. All methods of preservation and the conditions of storage attempted to reduce the above mentioned changes. Therefore, the present study investigate the affect of using carbon dioxide (CO2), nitrogen gas (N2) and air upon the quality of chicken egg. This study was carried out at Sides Experimental station, Animal Production Research Institute, Minister of Agriculture. The of two local eggs strains Gimmizah and Bandara were used throughout this experiment. They stored for up to 3 weeks in plastic bag filled with (CO2) and (N2) gas and air beside eggs stored for the same period in ,room air The results obtained in this study will be summarized as follow:
1- Egg weight loss percentage.
The percentage of egg loss weight for Banadara eggs was higher than those of Gimmizah eggs.
The loss in egg weight was found to be as a function of storage period. Also, the percentage of weight loss was more pronounced for Theses stored in plastic bag filed with (N2) than those kept in bags filled with (CO2).
2- Yolk quality traits:
High yolk percentage was recorded for Bandara eggs.Also yolk percentage was due to the increasing of storage period same for Gimmizah and Bandara eggs stored in plastic bags filled with carbon dioxide than other gases. Yolk index for Gimmizah and Bandara eggs gradually decreased due to the increasing of storage period, Also, yolk index for eggs stored in plastic bag filled with (CO2) is more higher than those kept in bags filled with other gases.
Yolk color of Bandara egg was found to be egg yolk color get darker by passing the time of darker than Gimmizah egg yolk in all conditions, and storage.
3- Albumen quality traits:
During storage period for up to three weeks, albumen quality gradually decreased as a function of storage period. This may be due to the loss the
water content of eggs due to the evaporation small loss of gases resulting from the respiration process inside the eggs. On the other hand, albumen percentage for eggs stored in (N2) gas was more pronounced than in those stored in other gases.
4- Haugh unit:
Bandara eggs have higher Haugh unit than Gimmi- zah eggs. This unit decreased as a function of storage time. Gimmizah eggs have higher Haugh unit when stored in (CO2) gas than other kept in plastic bag filled
with air and the lowest value was recorded for these kept in bags filled with (N2). For Bandara eggs stored in room air, Haugh unit was higher than those kept in Plastic bags filled with different gases.
5- Shell quality traits:
Shell egg weight was found to be higher in Ban- dara eggs, while the shell percentage for Gimmizah eggs was slightly higher than that for Bandara eggs. Meanwhile, it was observed that shell percentage and thickness gradually decreased throughout the experimental period (three weeks). Shell thickness of Gimmizah eggs stored in room air (control) was higher followed by those kept in plastic bags filled with air, (N2) and (CO 2 ), respectively. And so, shell thickness of Bandara eggs stored in room air was higher followed by those kept in plastic bags filled with (N2), (CO2) and air, respectively. Generally, storing eggs increased the values of specific gravity, yolk percentage, yolk diameter and yolk color, while it decreased yolk index, yolk height, albumen percentage, albumen height, Haugh unit, shell percentage and shell thickness.
6- Fertility and hatchability:
The present study clearly indicates that the fertility percentage decreased throughout the experimental period. It was observed that Bandara eggs have more fertility percentage (92%) than Gimmizah eggs (90%). In general, there are no effect for different storage conditions on fertility percentage.
7- Hatchability percentage:
The hatchability percentage of fertile eggs of Gimmizah breed was higher than Bandara breed throughout the experimental period (three weeks) and under different storage conditions, the hatchability percentage of fertile eggs was decreased. However, the most promising hatchability percentage was for those hold in bags filled with air and for these kept in room air (control), respectively. The present study indicated that (CO2) gas reduce the hatchability percentage of the Gimmizah and Bandara eggs.
On the light of the above mentioned results it could be concluded that storing eggs in plastic bags filled with air is the more promising method for keeping the good quality of eggs and high hatchability percentage for Gimmizah and Bandara breeds. Also, storing for one week is more suitable for keeping high hatchability percentage and good quality of eggs for both breeds studied.
8- Chemical analysis:
Gimmizah and Bandara fresh egg yolk have closed amount of total protein and cholesterol, while Bandara eggs have higher amount of total lipids than egg of Gimmizah eggs. The protein percentage of yolk egg of Gimmizah eggs stored in room air (control) was higher than those held in different treatments, while the value of total protein for yolk egg of air (control) and these kept (N2), respectively. in bags filled with Bandara eggs stored in bags filled with air was higher than other treatments.
Meanwhile the present study indicated that total lipids increased during storage period for both breeds and it was also observed that the total lipids of yolk egg for those stored in bags contained (CO2) followed by air and those held in room (control ) and these kept in bags filled with (N2) , respectively.
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| Publication year |
1998
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| Pages |
180p.
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| Availability location |
مكتبة معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
623
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| Organization Name |
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| Country |
Egypt
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| Department |
Poultry Breeding Research Department
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Carbon dioxide.
Density.
Egg characters.
Egg hatchability.
Egg white.
Egg yolk.
Layer chickens.
Nitrogen.
Poultry.
Preservation.
Storage.
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| Proposed Agrovoc |
yolk index;yolk color;
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| Publication Type |
Master Thesis
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