I think it was the question, ovo choco ou galinha choca...

  I will pick the easier one, then (tough  depend on context, sort of ).

  "Ovo choco" would be stale or rotten egg, by what I have read in the poultry and

farm sites.  Stale looks like a "mild rotten", you would ''taste'' and "smell" it mainly after

having made scrambled eggs by their vapors.

   Another way of saying, but seems like more farmer-worthy, is "dead in the shell chicks." 

    To me, stale could be also an egg past its time. Perhaps any egg stale is past its time, but not past it time is stale.     Sometimes past its time can be just that it´s not fresh, stale have an unpleasant aftertaste and rotten is a dead in the shell chick.

     Well, just wondering...in this paragraph...

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    http://www.chemicalbiological.net/the%20egg.html
"An egg is edible for up to five weeks old. Then, it is past its time. It may even be rotten."              ...Stale/Or Rotten Egg.

   http://blogs.reuters.com/oddly-enough/2010/01/19/fatty-pork-and-rotten-eggs-for-lunch/
    "So you’re saying this is just a fun story, and not about eggs that have gone bad?"

   http://www.wikihow.com/Breed-Chickens
"If the eggs do not hatch, please be sure to properly dispose of them - rotten eggs can really create a nasty stench! "

   http://www.birdsnways.com/wisdom/ww61e.htm

  HEAT
One of the problems encountered with inexperienced or immature hens is that they will come off the eggs at a critical time in the incubation of the eggs, allowing them to become cold or chilled. When this happens in the first two weeks, the embryos stop developing and this results in dead in the shell chicks. The hen will come off the eggs to eat and take care of her needs. The eggs that are left in the nest, being in close proximity to each other, will remain warm for short periods of time. It is when the hen abandons the eggs for hours at a time that there is cause for concern. After the first two weeks variations in temperatures seem to have less negative effects on developing embryos.

DEAD IN THE SHELL CHICKS
There are several major reasons why this can occur. Malnutrition of the parents is a contributing factor. Deficiencies of vitamin E and Selenium cause reproductive problems in breeding birds. Excessive humidity during the incubation process causes problems with transpiration through the pores of the egg shell. The gas exchanges take place through the pores of the egg before the internal pip of the chick into the air cell. A high humidity can cause the chick to attempt to hatch from the wrong end of the egg. The right relative humidity is therefore extremely important to having chicks hatch successfully.