Electronic Journal of Differential Equations,
Vol. 2009(2009), No. 126, pp. 1-9.

Title: Twin periodic solutions of predator-prey dynamic system 
       on time scales

Authors: Rong-Hua He (Chengdu Univ., Sichuan, China)
         Hong-Xu Li  (Sichuan Univ., Chengdu, China)
	 Liang Zhang (Sichuan Univ., Chengdu, China)

Abstract:
 In this article, we consider a delayed predator-prey dynamic system
 with type IV functional responses on time scales. Sufficient
 criteria for the existence of at least two periodic solutions are
 established by using the well-known continuation theorem due to
 Mawhin. An example is given to illustrate the main result.
 
Submitted December 2, 2008. Published October 04, 2009.
Math Subject Classifications: 92D25, 39A12.
Key Words: Time scales; delayed predator-prey dynamic system; 
           periodic solutions; continuation theorem.