These studies were carried out at the farm of Cantho university, Vietnam and was supported by the Swedish International Development Coorperation Agency (SIDA), Department for Research coorperation with Developing countries (SAREC), for which I greatly indebted.
I would like to express my sincerely gratitude to:
Prof. Dr. Inger Ledin, Department of Animal Nutrition and Management, SLU for her kind help and encouragement.
Ass. Prof. Dr. Luu Trong Hieu previous and now Dr. Ngo Van Man, Regional Coordinator, Mr. Nguyen Van Cong for their warm wellcome and the caring with all their heart to me.
All the lecturers and instructors from the Swedish University of Agricultural Sciences, Sweden; NAFRI of Lao, University of Tropical Agriculture (UTA), KhonKean University, Thailand; AnGiang University, Cantho University, University of Agriculture and Forestry (UAF) for their expert knowlegement and contributions into the our courses.
My department, Dr. Nguyen Thi Kim Dong, Mr. Nguyen Van Liem, Mr. Giang, Mr. Chuyen, Mrs. Linh and Mrs. Dan Thanh for facilitation and make advantage condition during conducting experiments.
My friends in the MSc. Course, from Thailand, Lao, Cambodia and Vietnam for keeping a warm atmosphere and valuable help during the time away home.
To my family, my respectable mother and father, my wife, my lovely daughters and my young brother for all the believes to me as well as the encouragement and helping during the studying.
The last, my gratitude to all those anonymous peoples who the names can not appear in here.