Best Aid for Improving Sex-Limited Traits
Most effective aid to selection for improving sex-limited trait is-
- Progeny testing — Correct Answer
- Sib selection
- Family selection
- Individual selection
Explanation:
Correct Answer: Progeny testing
For sex-limited traits (like milk yield or egg laying), the trait cannot be measured in the opposite sex. Progeny testing is the most effective and accurate method to evaluate a sire's true breeding value for such traits — by measuring the performance of a large number of daughters.
Why Progeny Testing is Best for Sex-Limited Traits
- A bull cannot produce milk; his milk-transmitting ability can only be evaluated through daughters.
- More daughters tested → more accurate estimate of sire's BV (Breeding Value).
- Progeny testing is described as a 'two-way selection system': identifies best sires AND culls inferior ones.
- Progeny testing is also the most effective basis of selection overall.
Comparison of Aids to Selection for Sex-Limited Traits
| Aid | Applicable for Sex-Limited Traits? | Notes |
|---|---|---|
| Progeny testing | Yes — most effective | Uses daughters' performance |
| Family selection (Sib selection) | Yes — effective | Uses sisters' performance |
| Pedigree selection | Yes — useful | Uses dam's performance |
| Individual selection | No — cannot be used | Trait not expressed in that sex |
📚 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.
