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Hen-day production is eggs collected as a percentage of hens alive that day, the standard laying performance measure. Egg mass per hen per day — production rate times egg weight — is a better index than egg number alone, because it captures the shift to fewer but heavier eggs in late lay.
Hen-day production
HDEP % = eggs collected x 100 / hens present
Egg mass
Egg mass (g/hen/day) = eggs x egg weight / hens
Modern commercial layers peak at 93-96% around 26-30 weeks and should hold above 90% for several months before declining to 75-80% by 72 weeks.
Hen-day divides by live birds and measures the performance of survivors. Hen-housed divides by the original number placed and captures mortality too, so it is the better commercial measure.