Characteristics of Nucleus Breeding Schemes
Which of the following statement(s) is/are true about Nucleus breeding schemes -
- CNBS is mainly used in pig & poultry but ONBS is used in cattle, buffalo & sheep
- Increase genetic progress & reduced rate of inbreeding is observed in ONBS
- Both a & b — Correct Answer
- None
Explanation:
Correct Answer: Both a & b
Both statements about Nucleus Breeding Schemes (NBS) are accurately stated in the notes — they apply correctly to CNBS and ONBS respectively.
NBS — Key Facts
| Feature | CNBS | ONBS |
|---|---|---|
| Species mainly used | Pigs & Poultry | Cattle, Buffalo & Sheep |
| Gene flow direction | Unidirectional (N→M→V) | Bidirectional (N↔M↔V) |
| Inbreeding rate | Higher | Reduced |
| Genetic progress | Lower | Increased |
| Nucleus herd | Closed to outside genes | Open — superior animals can move up from village herd |
NBS Population Structure
- Nucleus herd: Elite females — top 10–15% of total herd; source of genetic improvement
- Multiplier/Test herd: Middle tier — multiplies and tests genetics
- Village/Commercial herd: Majority of population — receives genetic gains last
- Genetic gain flows: N → M → V (in CNBS); bidirectional in ONBS
📚 About this Topic — Animal Genetics & Breeding
This multiple choice question is from Animal Genetics & Breeding, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Genetics & Breeding to strengthen your preparation.
