Suggest some preventive measures for the diseases of poultry birds.

Explanation

### Step-by-Step Solution:

1. **Understanding the Life Stages of Poultry Birds**:
- Poultry birds, especially layers, go through two distinct life phases: the growing period and the laying period. Understanding these phases is crucial for implementing preventive measures.

2. **Growing Period**:
- This phase lasts until the birds reach sexual maturity. During this time, they are referred to as "growers."
- **Preventive Measure**: Ensure adequate space for the growers. Overcrowding can hinder their growth and make them more susceptible to diseases.
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