Method of Sexing Based on Sex-Linked Traits
Colour of plumage & feather growth both are sex-linked characters. The method of sexing on the basis of sex-linked characters in poultry is known as:
- Vent method
- Autosexing — Correct Answer
- Proctoscope method
- None
Explanation:
Correct Answer: Autosexing
Autosexing is the method of determining the sex of day-old chicks visually by exploiting sex-linked traits such as plumage colour (barring) or feather growth rate (rapid vs. slow feathering). Since these genes are Z-linked, their expression differs between ZZ males and ZW females at hatch.
Methods of Sexing in Poultry
| Method | Basis | Notes |
|---|---|---|
| Autosexing | Sex-linked traits (feather colour, feather growth) | Non-invasive; uses Z-linked gene differences at hatch |
| Vent sexing | Visual examination of cloacal morphology | Skilled operator needed; invasive; used for non-autosexing breeds |
| Proctoscope method | Internal examination of gonads | Most accurate but most invasive; rarely used commercially |
Sex-Linked Feathering Genes Used in Autosexing
- Rapid feathering (K⁺): Recessive on Z; rapid-feathered chicks are female in crosses with slow-feathered males
- Barring (B): Dominant on Z; used in sex-linked barred crosses to colour-sex chicks at hatch
📚 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.
