Eggs and Yin Yang

Yin represents feminine, cold, darker, and night

Yang represents masculine, hot, lighter, and day

Yin: Duck and Goose Eggs

Ducks and geese lay their eggs normally during the dark period, no sun shine, i.e. before sun rise, or after sun set, and at night time (based on interview to some farmer). They might lay eggs during the day but it is not often; and to some extent these "day light" eggs are considered less in quality as some people said that day light eggs from the duck or goose can not be used to make salted eggs.

The dark time period of laying eggs causes duck and goose eggs absorb Yin energy. Thus, duck and goose eggs have Yin energy. No wonder some Chinese people said that eating duck or goose eggs is better, healthier than chicken eggs for male. The explanation might be related to the concept of balancing nature, which are simply duck/ goose eggs (Yin) and the male body (Yang).

Yang: Chicken Eggs

Hens lay their eggs during the day, hence chicken eggs have more Yang energy. Better for female.