Correlation Between Milk Yield and Draught Capacity
Milk yield & draught capacity of cattle has a relation-
- Negatively correlated — Correct Answer
- No correlation
- Positively correlated
- None of the above
Explanation:
Correct Answer: Negatively correlated
Milk yield and draught capacity are negatively correlated in cattle. Selection for high milk production favours a fine, angular dairy-type conformation (thin muscles, large udder), while selection for draught capacity requires heavy muscling and strong bones — these two body types are genetically antagonistic.
Examples of Genetic Correlation in Livestock
| Type | Trait Pairs |
|---|---|
| Positive correlation | Milk yield & fat yield; egg size & egg weight; birth weight & weaning weight; heavier sheep → more wool; heavier hens → larger eggs |
| Negative correlation | Milk yield & fat%; number of eggs & egg size; milk yield & draught capacity |
| No correlation | Milk yield & horn length; normal body temperature & body size |
Causes of Genetic Correlation
- Pleiotropy: Permanent cause — one gene affects multiple traits
- Linkage: Temporary/transient cause — linked genes tend to be inherited together
- Heterozygosity
📚 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.
