The author gratefully acknowledges the Swedish Agency for
Research Cooperation with Developing Countries (Sida-SAREC) and the
Swedish University of Agricultural Sciences for financial and
material support of this study.
I would also like to express my sincere gratitude to my
supervisor Dr. Brian Ogle for his professional guidance,
constructive criticism and enthusiastic help.
I am greatly indebted to Dr. Inger Ledin, Dr. Luu Trong Hieu,
and Dr. Le Viet Ly for their encouragement.
I would like to express my sincere thanks to Dr. Preston and Dr.
Xe for help in the statistical analysis.
I would like to express my sincere thanks to my teachers Mrs.
Minh, Mrs. Men, Mrs. Loan, Dr. Men, Dr. Son, Mr. Thong, my
colleagues and Thoai, Giau, Nghiep, and Duong, students at the
Department of Animal Husbandry of Cantho University for helping me
to run the experiment, for guidance and for performing the chemical
analyses in the laboratory.
And last but not least, a special thanks to my family for their
help, and to my husband for his love and patience.