I would like to express my sincere thanks to Dr. Thomas Reg Preston, my supervisor who had given me many useful recommendations, criticism and correction on my thesis writing carefully.
I also would like to express my deep gratitude to all professors, lecturers and their assistants for their transference of useful knowledge to all students in this course. And sincere thanks to Professor Dr. Brian Ogle and Professor Dr. Inger Ledin, teachers in the MEKARN project, which was supported by SIDA SARREC, Swedish fund.
My special thanks to all staff in The Faculty of Agriculture, National University of Laos especially Mr. Thonly Xayachack, Mr. Fongsamuth Suthammavong, the dean and vice dean of the faculty and Mr. Kham Phommachan, the chief of Livestock and fisheries department, who had given me the agreement and allowance to participate this course. Furthermore, they facilitated the essential materials, laboratory and provided assistants to me during my experimental work time.
Grateful thanks to Dr. Bounthong Bouahom, Director of National Agriculture and Forestry Institute for supporting, consultant and commends.
I thank my classmates from Laos, Cambodia, Vietnam and Thailand for their good relationship.
Finally, I would like to say many thanks to my parents, brothers
and sisters for their giving moral support, love and anxiety.