Concept:
Different poultry breeds are classified based on their productivity such as egg production, meat production, or dual purpose.
Step 1: Understanding Egg-laying Breeds
• Egg-laying breeds are selected for high egg production.
• They are lightweight and efficient converters of feed to eggs.
Step 2: Leghorn Breed
• Known worldwide for very high egg production.
• Produces large number of white eggs.
• Early maturity and efficient feed utilization.
Thus, called egg laying champion.
Step 3: Evaluating Other Options
• Brahma → Heavy breed, mainly for meat
• Sussex → Dual-purpose breed
• Minorca → Good layer but not as prolific as Leghorn
Step 4: Comparative Conclusion
• Leghorn surpasses all in egg production efficiency.
Final Conclusion:
\[
\boxed{\text{Leghorn}}
\]