One thing I have been thinking about but do not yet know the answer:
If one feeds a modern chicken a poor diet (one not designed for their genetics) and this results in fewer eggs, does this mean:
A) the chicken simply is not getting enough nutrition to produce more eggs
Or
B) the chicken's health is being compromised because their genetics are expecting/demanding superior nutrition, in addition to not being able to produce more eggs
Are not those two answers one in the same? As in the nutritional values are not meeting the body requirements so the body start shutting down to degree of lacking nutrition. Egg production is the first to go and if neglected body mass and vigor next.