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The research was performed on three Hu ewes with rumen fistula and duodenal fistula.After wheat in diet of sheep was treated with formaldehyde,total opioid- like bioactivity of duodenal digesta,non- ammonium nitrogen(NAN) and volatile fatty acides(VFA)of ruminal digesta,total nitrogen and acid detergent fiber(ADF)flowed into duodenum,and plasma insulin levels were analyzed.Results showed that comparing with that of control period,intake of coarse fodder in- creased by 7.99 %(P 0.05),NAN flowed into duodenum increased by 20.16 %(P 0.01),digestion of ADF increased by 8.79 %(P 0.01),bypass protein increased by 38.70 %(P 0.01),total opioid- like bioactivity of duodenal digesta increased by 72.30 %(P 0.01),plasma insulin levels increased by 104.91 %(P 0.05).It was concluded that formalde- hyde treatment of wheat in diet could improve digestion metabolism and endocrine of sheep.
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