The formulas to calculate space requirement for laying hens (laying beyond 22 weeks) are:

1. For Litter Floor:

\[ SR = 0.17 \cdot Na \]

2. For Slotted Floor:

\[ SR = 0.09 \cdot Na \]

3. For Slot-Litter Floor:

\[ SR = 0.14 \cdot Na \]

Where:

• \(SR\) is the space requirement in square meters.
• \(Na\) is the number of birds.