Effects of Spent Mushroom Substrate of Pleurotus eryngii as Fermentation Bed Padding on Growth Performance, Intestinal Microflora and Immunity of Weaning Piglets

摘要

[Objective] The paper was to examine the effects of spent mushroom substrate of Pleurotus eryngii as fermentation bed padding on growth performance, intestinal microflora and immunity of weaning pigs. [Method] A total of 120 weaning piglets(Duroc×Landrace×Yorkshire) with the average initial body weight of(8.0 ±0.5) kg were allocated to five dietary treatments in a randomized complete block design for 42 d, each of which was replicated three times with eight piglets per replicate( half male and half female). The padding for control group was 50% sawdust +50%rice husk; experimental group I, 100% spent mushroom substrate; experimental group II, 15% sawdust +15% rice husk +70% spent mushroom sub-strate; experimental group III, 25% sawdust +25% rice husk +50% spent mushroom substrate; and experimental group IV, 35% sawdust +35% rice husk +30% spent substrate. [Result] Except for experimental group IV, the other three experimental groups had higher average daily gain compared to the control group(P<0.05). The average daily feed intake in experimental group I increased obviously compared to the control group( P<0.05). Except for experimental group I, the diarrhea rate of weaning piglets in experimental groups II, III and IV significantly decreased compared to the control group(P<0.05). The number of lactobacilli and bifidobacteria in colon and cecum in experimental groups I, II and III increased distinctly( P<0.05), while the number of Escherichia coli and Salmonella decreased remarkably compared to the control group(P<0.05). The positive rates of T and B lymphocytes in peripheral blood of weaning piglets in four experimental groups were significantly higher than that in control group at 21 and42 d post weaning(P<0.05). The Ig A content of intestinal mucous in piglets was significantly improved in experimental groups II and III( P<0.05).[Conclusion] It enhances the production performance when improving immunity and reducing diarrhea rate of piglets by using spent mushroom substrate of P. eryngii as the fermentation bed padding. Experimental group III(25% sawdust +25% rice husk +50% spent mushroom substrate) is the optimal proportion of spent mushroom substrate.