Efficiency of Multi-Trait Selection Methods
The increasing order of efficiency of methods of selection is-
- Tandem selection < Independent culling < Selection index — Correct Answer
- Tandem selection < Selection index < Independent culling
- Independent culling < Selection index < Tandem selection
- Independent culling < Tandem selection < Selection index
Explanation:
Correct Answer: Tandem selection < Independent culling < Selection index
The efficiency of multiple-trait selection methods increases from Tandem selection (least efficient) to Selection index (most efficient). This classification was given by Hazel and Lush (1942).
Multi-Trait Selection Methods — Comparison
| Method | Traits | Efficiency | Key Feature |
|---|---|---|---|
| Tandem selection | One at a time | Least | Ignores genetic correlations between traits; time-consuming |
| Independent culling | All simultaneously | Intermediate | Minimum standard set for each trait; fail any one → cull regardless of merit in others |
| Selection index | All simultaneously | Best / Most efficient | Single numerical score; economic weights; superiority in one trait can offset slight deficiency in another |
Example of Independent Culling
- If minimum standard: milk yield ≥ 10 L/day AND fat ≥ 5%
- A cow giving 15 L/day with 4% fat → CULLED (failed fat standard, despite excellent milk yield)
📚 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.
