Egg Within an Egg Condition

Correct Answer: Reverse peristalsis of oviduct

The egg-within-an-egg condition occurs due to reverse peristalsis of the oviduct. In this condition, a fully formed egg is pushed backward (anti-peristalsis) into the upper oviduct, where it becomes engulfed by another developing egg, resulting in an egg inside another egg.

Other Abnormal Egg Conditions

• Double yolk egg: Two ova released simultaneously or one ovum pushed back when another ovulates.
• Soft shell: Calcium deficiency.
• Off-coloured egg / Discoloured yolk: Feeding of cottonseed cake (contains gossypol pigment).
• Blood spot: Haemorrhage in ovary/infundibulum (yolk) or magnum (albumin).