The formulas to calculate space requirement for cattle ranch (holding pen) are:

1. For Up to 270 kg:

\[ SR = 1.30 \cdot Na \]

2. For 270-540 kg:

\[ SR = 1.60 \cdot Na \]

3. For Over 540 kg:

\[ SR = 1.90 \cdot Na \]

Where:

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