True Statements About Nucleus Breeding Schemes
Which of the following is/are true about Nucleus Breeding Schemes (NBS)?
- CNBS is mainly used in pig and poultry; ONBS is used in cattle, buffalo, and sheep
- In ONBS, gene flow is bidirectional; inbreeding rate is reduced compared to CNBS
- Sire selection in NBS is based on Sibling test (less accurate than progeny testing but gives higher genetic gain per year due to shorter generation interval)
- All the above — Correct Answer
Explanation:
Correct Answer: All the above
Nucleus Breeding Schemes — Key Comparison
| Feature | CNBS (Closed) | ONBS (Open) |
|---|---|---|
| Gene flow | Unidirectional (N→M→V) | Bidirectional (N↔M↔V) |
| Nucleus herd | Entirely closed | Open — superior animals from village herd can enter |
| Inbreeding | Higher | Lower |
| Used in | Pigs and Poultry | Cattle, Buffalo, Sheep |
Sire selection in NBS: Sibling test (less accurate than progeny testing but shorter generation interval → higher genetic gain per year).
For faster genetic improvement: ONBS + MOET (Multiple Ovulation and Embryo Transfer).
📚 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.
