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Recycling of Fermented Sawdust-based Oyster Mushroom Spent Substrate as a Feed Supplement for Postweaning Calves
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 Title & Authors
Recycling of Fermented Sawdust-based Oyster Mushroom Spent Substrate as a Feed Supplement for Postweaning Calves
Kim, Min-Kook; Lee, Hong-Gu; Park, Jeong-Ah; Kang, Sang-Kee; Choi, Yun-Jaie;
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The objective of this study was to find the way to prolong the storage time of sawdust-based oyster mushroom (Pleurotus osteratus) spent substrate (OMSS) by fermenting with potential probiotic microorganisms to recycle the otherwise waste of mushroom farms. To this purpose, lactic acid bacteria (LAB) were screened to select the best lactic acid-producing strains. Three strains of LAB (Lactobacillus plantarum Lp1', Pediococcus acidilacticii Pa193, L. plantarum Lp2M) were selected and in mixture they lowered the pH of the fermented OMSS to 3.81. fOMSS (fermented sawdust-based oyster mushroom spent substrate) could be stored at room temperature for at least 17 days without any deterioration of feed quality based on the pH, smell, and color. In dry matter disappearance rate in situ, commercial TMR (total mixed ration), OMSS and OMMM (oyster mushroom mycelium mass) showed no significant differences between the samples after 6, 12 and 24 h incubation except for 48 h. Two separate field studies were performed to test the effects of fOMSS supplement on the growth performance of postweaning Holstein calves. Field trials included groups of animals feeding calf starter supplemented with: Control (no supplement), AB (colistin 0.08% and oxyneo 110/110 0.1%), fOMSS (10% fOMSS) and fConc (10% fermented concentrate) and DFM (direct-fed microbials, average cfu for each of three LAB/d/head). Growth performance (average daily gain and feed efficiency) of the fOMSS supplement group was higher than that of AB followed by fConc and DFM even though there was no statistically significant difference. The Control group was lower than any other group. Various hematological values including IgG, IgA, RBC (red blood cell), hemoglobin, and hematocrit were measured every 10 days to check any unusual abnormality for all groups in trial I and II, and they were within a normal and safe range. Our results suggest that sawdust-based OMSS could be recycled after fermentation with three probiotic LAB strains as a feed supplement for post-weaning calves, and fOMSS has the beneficial effects of an alternative to antibiotics for a growth enhancer in dairy calves.
Postweaning Holstein Calves;Fermentation;Sawdust-based Oyster mushroom Spent Substrate;Antibiotic Alternative;Growth Performance;
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