Correlation: Milk Yield vs. Draught Capacity

Correct Answer: Negatively Correlated

From the notes (Examples of Correlation section): Milk yield and draught capacity are listed as negatively correlated. High-yielding dairy animals tend to have fine, light body frames while draught animals have heavy, muscular bodies — these are antagonistic traits.

Important Correlation Examples (from notes)

Positively Correlated

• Size of eggs and weight of eggs
• Milk yield and fat yield in dairy animals ✔
• Heavier sheep → more wool
• Heavier hen → larger eggs
• Birth weight and weaning weight in cattle

Negatively Correlated

• Milk yield and fat%
• Number of eggs produced and size of eggs
• Milk yield and draught capacity ✔

No Correlation

• Milk yield and horn length
• Normal body temperature and body size

Types of Genetic Correlation (from notes)

• Pleiotropy: Permanent cause of genetic correlation
• Linkage: Transient/temporary cause of genetic correlation