Selection Method for One Trait at a Time
In __________-selection, only one trait is selected at a time.
- Tandem — Correct Answer
- Independent culling
- Selection index
- Progeny testing
Explanation:
Correct Answer: Tandem
In Tandem selection, the breeder selects for only one trait at a time. Once the desired level of improvement is achieved for that trait, focus shifts to the next trait. It is given by Hazel and Lush (1942).
Comparison of Multi-Trait Selection Methods
| Method | Traits Selected | Efficiency | Special Feature |
|---|---|---|---|
| Tandem selection | One at a time | Least efficient | Simplest; ignores genetic correlations |
| Independent culling | Two or more simultaneously | Intermediate | Minimum culling standard set for each trait; fail in any one → cull |
| Selection index | All simultaneously | Most efficient (best method) | Single numerical expression; weights each trait by economic value |
Why Other Options Are Wrong
- Independent culling: Selects for multiple traits simultaneously using minimum thresholds.
- Selection index: Best/most efficient method; selects all traits at once with economic weights.
- Progeny testing: A basis of selection (evaluates an animal through offspring performance) — not a multi-trait selection method.
📚 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.
