P - R
Peck(ing) order: the social organisation of a flock ranging in a ladder formation from the most dominate to the most subordinate member of the flock.
Pendulous crop: an enlarged crop usually due to impaction and which hangs downwards in an abnormal way.
Perchery system: a system of housing consisting of a litter floor plus a number of perches installed to increase the number of birds that the house will hold. Some of the perches carry feeders and drinkers.
Point of lay: females just prior to starting to lay.
Preen gland (uropygeal gland): a gland located at the base of the tail which produces a special oil secretion for the conditioning or preening of the feathers.
Primaries: the ten long, stiff flight feathers at the outer extremity of the trailing edge of the wing. They are separated from the inner group or secondaries by the axial feather.
Production efficiency: the relationship between the various major production factors which, depending on the class of stock, will include food consumption, live weight gain, egg production and mortality.
Proventriculus: the glandular stomach of birds located in front of the gizzard.
Pullet: a female in her first laying season. Often used to refer to young females post brooding to point of lay.
Purebred: a group of birds having the same origin, and able to reproduce their own likeness in their offspring. Purebred birds have the same genotype, but all birds with the same genotype are not necessarily purebreds.
Relative humidity: the percentage of moisture saturation in the air. There is a direct relationship between temperature and relative humidity - as the temperature increases, the relative humidity decreases and as temperature decreases, the relative humidity increases.
Roost: the perch on which fowls rest or sleep.
Rooster: male bird.
Chris