16d (edited) • General discussion
🥚 Egg Anatomy: What’s Inside & What Each Part Does
Sorry for the quietness, my daughter and I got sick last week. We are much better now, thank God😊
Now let’s get cracking and learn about eggs!
SHELL (Outer Protection)
🥚Made of calcium carbonate (~94%)
🥚Contains 7,000-17,000 tiny pores for gas exchange
🥚Allows oxygen in, carbon dioxide and moisture out
🥚Bloom/cuticle: invisible protective coating that seals pores
SHELL MEMBRANES (Two Layers)
🪺Outer membrane: attached to shell
🪺Inner membrane: surrounds egg contents
🪺Together create barrier against bacteria
🪺Separate at blunt end to form air cell
AIR CELL
💨Forms as egg cools after laying
💨Located at blunt/large end
💨Grows larger as egg ages (moisture loss through pores)
💨Freshness indicator: small air cell = fresh egg!
💨Provides oxygen for hatching chick
ALBUMEN (Egg White)
Four distinct layers:
🥚Outer thin albumen: watery, closest to shell
🥚Outer thick albumen: gel-like consistency
🥚Inner thin albumen: surrounds yolk
🥚Inner thick albumen: cushions yolk
Functions:
🐓Protein source (primarily ovalbumin)
🐓Shock absorption/cushioning
🐓Antimicrobial protection
🐓Water reservoir for developing embryo
CHALAZAE (Twisted Cords)
🪢White, rope-like strands on either side of yolk
🪢Anchor yolk in center of egg
🪢Keep yolk suspended and protected
🪢More prominent = fresher egg!
🪢Completely safe to eat
YOLK (Nutrient Center)
🟡Contains most nutrients: fat, vitamins, minerals
🟡Color varies by hen’s diet (darker = more carotenoids)
🟡Surrounded by vitelline membrane (holds yolk shape)
🟡Germinal disc: small white spot where embryo develops if fertilized
VITELLINE MEMBRANE
🪺Clear membrane surrounding yolk
🪺Weakens with age (old egg yolks break easily)
🪺Keeps yolk contents contained
Egg Formation Timeline:
Total time: 24-26 hours per egg!
🐓Yolk formation: ovary
🐓Albumen added: magnum (3 hours)
Membranes added: isthmus (1 hour)
🐓Shell formed: shell gland (20+ hours!)
🐓Bloom applied: just before laying
Your turn:
❓Ever noticed the chalazae and wondered what they were?
❓What’s the coolest egg fact you’ve learned that surprised you? 🥚
❓ Did y’all ever play that egg tossing game? I guess the fresher egg would have been more likely to win😅
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🥚 Egg Anatomy: What’s Inside & What Each Part Does
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