Egg Storage Duration, Egg Quality, and Chicken Embryonic Development

Incubation & Embryology
Written By Jennifer Bryant

Research Review

How long hatching eggs are stored before incubation can change egg quality, embryo development, hatch timing, and the width of the hatch window. This review examines a 2022 imaging study that compared eggs stored for 0, 3, or 10 days.

Source Paper

Adriaensen, H., Parasote, V., Castilla, I., Bernardet, N., Halgrain, M., Lecompte, F., & Réhault-Godbert, S. (2022). “How Egg Storage Duration Prior to Incubation Impairs Egg Quality and Chicken Embryonic Development: Contribution of Imaging Technologies.” Frontiers in Physiology, 13, 902154. Read the original research and DOI record. https://doi.org/10.3389/fphys.2022.902154

Why This Paper Matters

Egg storage is often reduced to a simple question of whether an egg is “fresh.” This study shows that storage duration changes the internal egg environment and can influence embryo survival and development after incubation begins. It also helps explain a counterintuitive timing pattern: eggs set on the day they are laid may hatch slightly later than eggs stored for one or two days, while prolonged storage can delay hatch and reduce hatch synchrony.

Study Design

The researchers studied Ross 308 broiler hatching eggs stored for 0, 3, or 10 days at 16°C (60.8°F) and 80% relative humidity. Traditional egg-quality measurements were combined with computed tomography (CT) and magnetic resonance imaging (MRI), allowing the team to follow internal egg changes and embryo development without opening the eggs.

Key Findings

  • Storage changed yolk condition, albumen pH, and air-cell volume.

  • Fertility and sex ratio were not affected by storage duration in this experiment.

  • Mortality among viable eggs was higher after 10 days of storage than after 3 days.

  • Ten days of storage impaired embryo growth; reduced embryo and brain volumes were detectable by Day 11 of incubation.

  • Evidence reviewed in the paper indicates that storage beyond about seven days is commonly associated with reduced hatchability, delayed hatching, and lower chick quality.

Egg Age Is Not Embryo Age

At proper storage temperatures, embryonic development is largely paused rather than continuing as it would under incubation. A stored egg is older on the calendar, but the embryo has not accumulated several additional days of incubation.

The relationship is not linear. Eggs incubated immediately after laying may hatch later than eggs held for one or two days. Once storage becomes prolonged—particularly beyond about one week—the surviving embryos may require more time to hatch and the hatch window may widen.

Practical Application for Small Flocks

  • Plan to set hatching eggs within seven days when possible.

  • Do not assume that setting an egg immediately after laying always produces the earliest hatch.

  • Expect prolonged storage to reduce hatchability and potentially delay or widen the hatch.

  • Record collection dates and storage duration so hatch timing can be interpreted correctly.

  • Warm stored eggs gradually before setting and avoid condensation.

  • Compare similar batches before changing the incubation protocol.

Limits of the Evidence

This experiment used one commercial broiler line under controlled storage conditions. Breed, flock age, storage temperature, humidity, egg handling, and incubator conditions can change the outcome. The study directly measured egg quality and embryo development; some broader hatch-timing guidance comes from prior research reviewed in the paper rather than from a complete hatch-time trial in this experiment.

Poultry Nerds Takeaway

Short, properly managed storage is not automatically harmful, and a brief holding period may produce an earlier hatch than setting eggs immediately after laying. Prolonged storage is different: after about one week, risks to hatchability, embryo development, chick quality, and hatch timing become increasingly important.

Continue the Incubation Research Cluster

Research Review Notice: This article summarizes a peer-reviewed scientific publication and explains its practical application for poultry keepers, breeders, and educators. It is an original review written by Poultry Nerds and is not a reproduction of the original manuscript. Findings apply to the species, line, conditions, and outcomes evaluated by the researchers; additional research may support, refine, or contradict these findings.

Jennifer Bryant
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