I hereby declare that this thesis was composed and originated entirely by myself under the guidance of my supervisor. To the best of my knowledge, in addition to information derived from the published and unpublished works of others that has been acknowledged in the text and a list of references is given in the bibliography, the thesis does not contain any other published or unpublished research work by others, or any materials for another degree or diploma from the Chinese Academy of Agricultural Sciences and other educational institutions. The works contributed by other colleagues have been stated and acknowledged.
Боловсролын доктор(PhD)
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