What factor is NOT typically used to classify production systems?

The classification of production systems typically involves factors that directly influence the operational and biological aspects of agriculture. Breeding cycles are crucial as they determine the reproductive performance and efficiency of livestock or crops within a production system. Market prices play a significant role; understanding these helps farmers decide which crops or livestock to raise based on profitability and demand trends. Grass growth is important for systems that rely on pasture-based livestock production, as it directly affects feed availability and animal health.

In contrast, while climate conditions influence agricultural practices significantly, they primarily pertain to the broader environmental considerations that affect agriculture rather than acting as a classification criterion for specific production systems. Thus, climate conditions serve as an overarching factor impacting productivity but do not specifically categorize production systems in the same manner as the other options presented.