Egg Grading

GRADING OF Poultry EGGs

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Grading of Eggs

Grading of eggs is the sorting of eggs into different categories on the basis of some parameters like weight and internal quality in poultry. It helps in promoting identical packing and pricing and quality assurance to the consumers.

Importance Of Egg Grading

It stimulates the production of quality eggs and helps in reducing wastage. Straightforward market price reporting and easier advertising and establishment of brand names of the quality product are some of the other advantages of grading.

Types of Egg Grading

Basically, there is two way we can grade of eggs which is called BIS/ Agmark standard at the home. These are-

  • Grade of table eggs based on egg weight
  • Grade of table egg based on egg quality

But, it depends from country to country. Nevertheless, the requirement of egg grading more less the same worldwide. Therefore, I am going to elucidate the Indian which is called BIS/ Agmark standard.

1. Grade of table eggs based on egg weight

Table eggs are defined as an egg that is normally used as a consumer product in the household in our daily life. the more common table eggs items are egg fry, egg omelet, used in cake, bread, ice-cream, and other recipes.

GradeWeight Per Egg (gram)Weight per dozen eggs (gram)
Extra Large60 and above715 and above
Large53 to 59 631 to 714
Medium45 to 52535 to 630
Small38 to 44456 to 634

2. Grade of table egg based on egg quality

Egg quality vitally depends on some common content of the egg. For instance, eggshell, egg white which is called albumin, Aircell and yolk. Summarise overall prerequisite below

Quality
Factors
Grade-AGrade-B
ShellUnbroken. clean, sound, and normal shapesClean to moderately stained, sound but
slightly abnormal
Airshell 4 mm or less in-depth. practically regular8 mm or less in-depth, maybe free and
slightly bubbly
Egg whiteClean and reasonably firmClear and slightly weak
YolkFairly centered, practically free from defects, outline indistinctIt May be slightly off-centered, outline
slightly visible

grading of eggs also depends on egg-containing feces in some instances. Some Emeria spp is responsible for causing intestinal coccidiosis to cause indigestion and leading low-grade eggs.

See also- Drugs for Intestinal coccidiosis in poultry

How to perform Egg grading manually?

1. The weight of the egg is to be taken with the help of egg’s weighing balance.

2. The eggshell is to be inspected visually for its cleanliness and the egg is to be candIed for judging the soundness of the eggshell.

3. By means of handling the egg, the shape of the air cell can be known. The depth of air cells can be measured with the help of a measuring scale.

4. The firmness of egg white and the position of yolk can be judged with the help of the candling of the shelled egg.

GRADING OF EGG BY USDA

According to the USDA, grading generally involves the sorting of products according to

  • quality
  • size
  • weight,
  • and other factors that determine the relative value of the product.

United States Weight Classes for Consumer Grades of Shell Eggs

SIZE OR WEIGHT CLASSMINIMUM NET WEIGHT
PER DOZON (OZ)
MINIMUM NET WEIGHT
PER DOZON (LB)
MINIMUM WEIGHT FOR INDIVIDUAL
EGGS AT RATE PER
(OZ)
Jumbo305629
Extra large2750.526
Large244523
Medium2139.520
Small183417
Peewee1528
USDA EGG GRADING

United States grades for individual shell eggs are

  • AA
  • A
  • B

Summary of United States Standards for Quality of Individual Shell Eggs

Quality factorAA qualityAA qualityA quality
ShellClean
unbroken
practically normal
Clean
unbroken
practically normal
Clean to slightly
stained a
Unbroken
Abnormal
Air cell1/2 in. or less in depth
Unlimited movement
and free or bubbly
3/16 in. or less in depth
Unlimited movement
and free or bubbly
Over 3/16 in. in depth
Unlimited movement
and free or bubbly
WhiteClear
Firm
Clear
Reasonably firm
Weak and watery
Small blood and meat
spots present b
YolkOutline-slightly defined
Practically free from
defects
Outline-fairly well defined
Practically free from
defects
Outline-plainly visible
Enlarged and flattened
Clearly visible germ
development but no
blood
Other serious defects
Source: USDA (1983A).

Dirty cCheck c
Unbroken; adhering to dirt or foreign material,
prominent stains, moderate stained areas
in excess of B quality
Broken or cracked shell but membranes intact,
not leaking d
Source: USDA (1983A).
Note

a=Moderately stained areas permitted (~ of the surface if localized, or 1’6 if scattered). b=If they are small (aggregating not more than 1 in. in diameter). c=For eggs with dirty or broken shells, the standards of quality provide two additional qualities. d=Leaker has broken or cracked shell and membranes, and contents leaking or free to leak.

How to grade chicken eggs?

There are various way to grading chicken eggs. Basically, there are two world-class method for the grading of chicken egg perfectly-

  • Agmark grading of eggs
  • USDA method of egg grading

RELATED POST

DETERMINATION OF QUALITY OF EGGS

TOP ORGANIC EGG LAYING CHICKEN

Reference

Manual On Avian production And Management by Dr. Nilotpal Ghosh and Dr. Rajarshi Samanta


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RAMZAN ALI ,DVM
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