Dr. Fawad Khalil,
Reduced dietary energy will eventually lead to reduced egg production, but body condition will be lost first. The hen is pretty resilient and will lay eggs at the cost of body condition until her fat reserves become depleted and she reduces or stops egg production. In the short term your statement is correct, but in the long run egg production will be reduced. Thanks, Mike.
Is there any difference in providing the same amount of energy from carbohydrates and fats/oils?
Effect of reduced energy can cause the same negative effect at any stage of production.