Topics:
Animal Refresher, Poultry Science
Germinal Disc of Fertile vs Infertile Egg
Germinal disc of fertile egg & infertile egg are respectively known as:
- Blastoderm & Blastodisc — Correct Answer
- Blastoderm & Blastopore
- Blastodisc & Blastoderm
- None of these
Explanation:
Correct Answer: Blastoderm & Blastodisc
- Fertile egg: Germinal disc = Blastoderm — a multi-layered disc of cells that has already begun cleavage; diameter ~4.5 mm. Appears as a white ring with clear center under candling.
- Infertile egg: Germinal disc = Blastodisc — a single-layered disc of cells; diameter ~3.5 mm. Appears as a solid white disc without the ring structure.
Visual Identification
- Blastoderm (fertile): Bull's eye appearance — white ring with lighter center
- Blastodisc (infertile): Solid white spot, smaller and uniform
This distinction is important during candling and for selecting fertile eggs for incubation in breeding programs.
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This multiple choice question is from Animal Refresher, Poultry Science. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Refresher to strengthen your preparation.
