Y. M. Lusamila
Department of Animal, Aquaculture and Range Sciences, Sokoine University of Agriculture P.O Box 3004 Chuo Kikuu, Morogoro, Tanzania.

I. S. Selemani
Department of Animal, Aquaculture and Range Sciences, Sokoine University of Agriculture P.O Box 3004 Chuo Kikuu, Morogoro, Tanzania.

A. Z. Sangeda
Department of Animal, Aquaculture and Range Sciences, Sokoine University of Agriculture P.O Box 3004 Chuo Kikuu, Morogoro, Tanzania.

G. F. Fupi
Tanzania Livestock Research Institute, P.O. Box 5 Kongwa Dodoma, Tanzania