Outcrossing with Selected Sires
Outcrossing within a herd by use of selected sires is-
- Top crossing
- Selective breeding — Correct Answer
- inter se mating
- Grading up
Explanation:
Correct Answer: Selective Breeding
Selective breeding is defined as out-crossing (mating unrelated animals) within a herd, specifically using selected sires. It is considered the best method for improvement of buffalo breeds in India.
Selective Breeding — Key Facts
- Definition: Out-crossing within a herd with the help of selected sires
- Best method for: Improvement of buffalo breeds in India
- It combines the benefits of out-crossing (avoiding inbreeding depression) with deliberate sire selection
Types of Outbreeding — Comparison
| Type | Definition | Special Feature |
|---|---|---|
| Out-crossing | Mating unrelated animals of same breed | Simplest form of outbreeding |
| Selective breeding | Out-crossing within herd using selected sires | Best method for buffalo improvement in India |
| Top crossing | Pure-bred male × unrelated female (one generation) | Like grading-up but for one generation only |
| Grading-up | Pure-bred sire × local female, generation after generation | Pure breed obtained after 7–8 generations |
| Cross breeding | Mating between different breeds within same species | Produces crossbred; uses hybrid vigour |
| Species hybridization | Mating between different species | Farthest form of outbreeding; e.g., Mule |
Why Other Options Are Wrong
- Top crossing → pure-bred male × unrelated female; not restricted to within-herd selected sires
- Inter se mating → mating among crossbred animals themselves; different concept
- Grading up → repeated use of pure-bred sire over many generations to achieve purity; not selective breeding
📚 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.
