Which of the following is an example of a macro-environment factor?

• A. Climate
• B. Age
• C. Disease
• D. Castration

Answer: (A)

Macro-environment factors are broad external conditions that influence animals or a population as a whole, such as climate, season, and geography. Climate fits this since it describes large-scale weather patterns that affect many animals across a region, impacting feed availability, thermoregulation, reproductive timing, and disease pressure. In contrast, age is an intrinsic characteristic of an individual, not a broad external condition. Disease status reflects health that can vary among animals and is a management/health variable rather than a broad environmental factor. Castration is a management procedure applied to individuals, not a broad environmental condition. Therefore, climate is the macro-environment factor.