Period 2–3 days before the end of incubation when the chick breathes atmospheric oxygen from the air cell and begins to transition to pulmonary respiration.
Period of pulmonary respiration
Definition
Related terms
Parent stock
Category of multiplication flocks whose mission is the second crossing of lines ...
Parents
Individuals of the dam and sire lines with tested performance and combining abil...
Part per billion (ppb)
A unit equal to one billionth (10⁻⁹) of the whole.
Parts per million (ppm)
A unit equal to one millionth of the whole (0.001%).
Peak of egg production
The highest egg production achieved by a hen or flock during the laying period.
Pedigree hatching tray
Hatcher tray or box with partitions/holes that prevents uncontrolled movement of...
