Overcrowding in pens leads to what outcomes?

• A. No effect
• B. Increased stress and disease
• C. Improved growth
• D. Reduced feed intake due to better space

Answer: (B)

Overcrowding raises stocking density, so animals compete more for space, water, and feeding areas. That increased competition causes physiological and psychological stress, releasing hormones that can suppress immune function. A stressed immune system means animals are more likely to get sick, and the close quarters make it easier for diseases to spread. Waste buildup and poorer air quality in crowded pens also irritate the respiratory system, boosting illness risk. So, the main outcomes are higher stress and more disease. The other options don’t fit because overcrowding does produce noticeable effects, it usually doesn’t improve growth, and any change in feed intake tends to be a reduction due to stress rather than an improvement from having more space.