Studies on Some Reproductive Aspects Which Affect Laying of Eggs in Ducks

The water fowls, ducks and geese were along the river Nile in the valley and delta in Egypt, since the Ancient Egyptains (5000thousands year B.C.).The Present work aimes to :Throw some light on the effect of the different combinations of light dark systems of normal and abmormal lengths (ahemeral - non 24 his) on events of egg lay of pekin ducks. The traits studies were rate of lay, oviposition rythm, egg laid in 8 hrs model, egg cluch, paues lengths, egg and its components weights, fertility and plasma steroid hormones during the ovulatory cycle.