What is the Haugh Unit?

What is the Haugh Unit?.

The Haugh Unit is a measurement system based on the relationship between the height of the albumen (egg white) and the weight of the egg. It was developed in 1937 by Raymond Haugh, who sought a reproducible and accurate method to assess egg freshness. The higher the Haugh Unit, the fresher the egg.

The formula used to calculate the Haugh Unit is:

UH = 100 * log (H – 1.7W^0.37 + 7.6)

Where:

• UH: Haugh Unit
• H: Albumen height in millimeters
• W: Egg weight in grams

This calculation provides a standardized numerical value of egg freshness, eliminating subjectivity in its evaluation.

Classification of eggs according to the Haugh unit.

The Haugh Unit values allow eggs to be classified into different quality categories:

• 72 or more: Eggs of excellent quality and maximum freshness (Grade AA).
• Between 60 and 71: Good quality eggs with slight freshness reduction (Grade A).
• Less than 60: Eggs with more liquid albumen, lower freshness, and generally destined for the food industry (Grade B).

This classification is used by regulatory agencies and the poultry industry to ensure that consumers receive high-quality eggs.

Importance of the Haugh unit in the poultry industry.

Measuring the Haugh Unit plays an essential role in the poultry industry for various reasons:

• Ensures product freshness: Provides an objective criterion for assessing egg freshness before commercialization.
• Standardizes quality: Helps meet international regulations and ensures eggs maintain uniform standards.
• Facilitates commercialization: Assists in classifying eggs based on freshness and quality, which is key for supermarkets and exports.
• Enhances consumer confidence: Provides an additional guarantee of egg quality at the time of purchase.

Other egg quality metrics.

In addition to the Haugh Unit, other relevant metrics in the evaluation of egg quality include the Yolk Index and the USDA classification system.

• Yolk Index: This indicator measures the ratio between the height and diameter of the yolk, providing information about its firmness and internal structure. A higher, rounder yolk indicates greater freshness and quality, while a flatter yolk suggests aging or lower quality.
• USDA System: Assesses egg quality based on internal and external appearance, classifying them into AA, A, and B grades, allowing for standardized marketing based on freshness, texture, and consistency of the albumen and yolk.
• Yolk Color: Determined by the hen’s diet, its evaluation is conducted using the DSM Yolk Color Fan, a scale from 1 (pale) to 15 (intense), allowing dietary adjustments to achieve the desired shade.

How is the Haugh unit measured?.

To measure the Haugh Unit, specialized devices such as the Egg Tester Plus and other electronic analyzers are used. These devices precisely measure the albumen height and egg weight, automatically calculating the Haugh Unit within seconds.

The use of these technologies allows producers to evaluate large batches of eggs quickly and efficiently, ensuring an accurate classification with no margin for error.

The Haugh Unit is an essential parameter in assessing egg freshness, providing a reliable and standardized method used worldwide. Its application in the poultry industry ensures product quality, facilitates commercialization, and strengthens consumer confidence. With advanced measurement tools like the Egg Tester Plus, producers can maintain high-quality standards and offer fresh, safe eggs to the market.