Oscillation and Global Attractivity in Haematopoiesis Model with Delay Time

In this paper we shall consider the nonlinear delay differential equationwhere () denotes the density of mature cells in blood circulation and the time delay is the time between the production of immature cells in the bone marrow and their maturation for release in the circulating bloodstreams. We shall present sufficient conditions for the oscillation of all positive solutions of (*) about and establish sufficient conditions for the global attractivity of Our results extend and improve the well known oscillation results of (*) when m=0