The formulas to calculate space requirement for goats and sheep (lactating) are:

1. For 50-70 kg Pregnant:

\[ SR = 1.30 \cdot Na \]

2. For Over 70 kg Pregnant:

\[ SR = 1.60 \cdot Na \]

3. For 50-70 kg Lactating:

\[ SR = 2.00 \cdot Na \]

4. For Over 70 kg Lactating:

\[ SR = 2.30 \cdot Na \]

Where:

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