The company's shares have fallen more than 30 percent this year, compared with a 7.4% rise in the benchmark Hang Seng Index. In a filing over the weekend, China Yurun Food said Zhu had resigned due to commitments in serving the community and other personal investments that required more of his attention.
Chief executive Yu Zhangli had been appointed as chairman, and Li Shibao was appointed to replace Yu as chief executive.
China Yurun Food last month denied what it said were recent rumors alleging certain accounting misstatements. The company also said rumours alleging product contamination were ungrounded and misleading.
