What factor causes slight variations in the reported body weights for Yokohama chickens?
Answer
Variation in selection criteria (exhibition vs. robustness breeding)
The existence of differing reported weights for Yokohama roosters (e.g., 5-7 lbs versus 4.5-5.25 lbs) and hens is common for heritage breeds developed internationally. This variation often stems from the bird's intended purpose or the selection criteria used by breeders. Specifically, exhibition birds that are intensely selected for achieving maximum tail growth may possess a lighter frame when compared to birds bred primarily for general backyard robustness, leading to these slight, yet observable, discrepancies in body mass measurements.
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