Asian-Australasian Journal of Animal Sciences (Jan 2020)

Comparison of in vitro digestibility and chemical composition among four crop straws treated by Pleurotus ostreatus

  • Haitao Nie,
  • Ziyu Wang,
  • Jihao You,
  • Gang Zhu,
  • Hengchang Wang,
  • Feng Wang

Journal volume & issue
Vol. 33, no. 1
pp. 24 – 34


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Objective The effects of Pleurotus ostreatus on the feed utilization of broad bean stalks (BBS), rape straw (RS), paddy straw (PS), and corn stalk (CS) was examined. Methods The four roughages were co-cultured with Pleurotus ostreatus. The chemical composition; enzyme activities of laccase, carboxymethylcellulase (CMCase) and xylanase; carbohydrate and protein fractions (based on The Cornell Net Carbohydrate and Protein System [CNCPS]) were assessed at different days after inoculation (7, 14, 21, 28 d) and un-inoculated roughages (control, 0 d). The digestibility of nutrient components and the gas production of roughage with various incubation times were monitored at 0, 2, 4, 6, 9, 12, 24, 36, 48, 60, and 72 h using an in vitro ruminal fermentation method. Results A higher CMCase activity (0.1039 U/mL) and earlier time to peak (14 d) were detected in Pleurotus ostreatus cultured with CS (p0.05) in slowly-degradable carbohydrate (CB2) at different incubation times (p<0.05). Conclusion Assessment of the alterations in chemical composition, CNCPS system fractions, and the fermentation kinetics after biological pretreatment may yield a valuable database for evaluating the biological pretreatment of Pleurotus ostreatus in ruminant feed.