How do you prevent dirty eggs on the farm?

What should you check in the nests and litter?

Dirty nests and damp litter are the most common source of dirty eggs, because the dirt comes from the place where the egg is laid. The items below deal with that source before any other measure.

1. Keep the nests clean and dry, changing the material as soon as it gets dirty.
2. Remove damp litter or litter with accumulated faeces before it contaminates the neighbouring nests.
3. Check the nests regularly, and not only when production drops.
4. Adjust the ventilation and humidity of the house so that the litter does not stay soaked.

What should you check in collection?

Collection shortens the time an egg is exposed to the environment. How often to collect is the farm's decision, and the guide on collection frequency explains its effect in general terms.

1. Collect eggs at a frequency that keeps up with laying, without letting them pile up in the nest or cage.
2. Adjust the routine to the flock and to the farm's system, and record each change you make.
3. Separate at once the eggs that fell on the floor or are visibly dirty, and do not return them to the tray.
4. Confirm that the team knows the destination of a dirty egg before the shift starts.

What should you check on the belt and during handling?

On the belt, a broken egg is the main source of dirt for its neighbours, because spilled yolk sticks to the shell. The collection belt maintenance guide details the causes.

1. Keep the collection belts clean, removing yolk and the remains of broken eggs.
2. Take a broken egg off the line as soon as it appears, so that its yolk does not soil the eggs that follow.
3. Train the team not to drag eggs over dirty surfaces or stack them in dirty containers.
4. Replace damaged or dirty trays before reusing them.

When does washing come in?

Washing is a last resort, not the first measure. In Brazil it is mandatory for dirty eggs that are not cracked and go to industrial processing (MAPA, question 28). Cracked eggs may not be washed (MAPA, question 28), and washing must be done entirely by mechanical means, with procedures that prevent microbial penetration into the egg (MAPA, question 30).

1. Wash only the eggs the rule allows: dirty, not cracked, and destined for industrial processing.
2. Do the washing entirely by mechanical means, with procedures that prevent microbes from getting into the egg.
3. Do not wash cracked eggs, and do not use dirty and cracked eggs to make egg products (RIISPOA, art. 228).
4. Discard a dirty and cracked egg at once, or break it in a properly labelled container (MAPA, question 26).

How do you record whether prevention is working?

Without a record, you cannot tell whether a change reduced dirty eggs or only moved them to another house. Vigiovo records the class of every egg along with its reason, which helps follow the trend, but it sees only the shell and does not point to the origin. The origin comes from comparing the routine with the result, and the dirty and cracked egg indicators show how to set up that comparison.

1. Record the number of dirty eggs per house and per day, so that changes show up early.
2. Compare the result before and after each change to the nests, the litter or the collection routine.
3. Investigate the cause whenever a house moves away from its usual pattern.
4. Review this checklist when the flock, the equipment or the collection routine changes.

Frequently asked questions

Does washing a dirty egg solve the problem?

Only in part. Washing cleans eggs without cracks that go to industrial processing, but it does not correct the source of the dirt. The rules treat washing as a hygiene step, and prevention on the farm remains the more effective path.

What is the difference between a dirty egg and a cracked egg?

A dirty egg has an intact shell with dirt stuck to it. A cracked egg has a broken shell, with or without dirt. When both defects appear together, the egg must be discarded at once or broken in a labelled container (MAPA, questions 5 and 26).

Is more frequent collection enough to prevent dirty eggs?

No. Collection shortens the time the egg is exposed, but dirt also comes from poorly kept nests and litter and from broken eggs on the belt. Prevention works when all these fronts are handled together and recorded.

Sources

1. Decreto nº 9.013/2017 (RIISPOA), Presidência da República (Brasil)
2. Perguntas e respostas sobre a Portaria MAPA nº 612/2022 (versão de 05/06/2023), Ministério da Agricultura e Pecuária (MAPA)