Daş Gürbüz, Brameld John M, Parr Tim, Seyedalmoosavi Mohammad M, Görs Solvig, Metges Cornelia C
Research Institute for Farm Animal Biology (FBN), Dummerstorf, 18196, Germany.
School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK.
Poult Sci. 2024 Dec;103(12):104341. doi: 10.1016/j.psj.2024.104341. Epub 2024 Sep 18.
We investigated if feeding earthworms (EW) or vermicompost (VC) to broilers improves performance and aids in coping with dietary challenges from a soluble non-starch polysaccharide (NSP)-enriched diet (negative control diet; CON-). Newly-hatched male Cobb-500 birds (N = 480) were fed either a positive (+) control diet (CON+, n = 240) or CON+ supplemented with either 1% EW (CON+EW; n = 120) or 1% VC in DM (CON+VC; n = 120) for 8 d (Period 1; P1). At the end of P1, blood and intestinal samples were taken from half the birds in each group. Half of remaining birds on CON+ stayed on CON+ for further 8 d (P2; d9-16) or switched to CON-. Birds on CON+EW and CON+VC in P1 were switched to CON- in P2 (CON-EW and CON-VC, respectively). The CON+VC improved (P < 0.05) BW and ADG in P1 through an elevated feed intake (FI) (P < 0.05) with no effect on FCR. CON+EW did not differ from the CON+ in terms of growth and FI in P1. In P2 CON- did not affect growth or DMI relative to CON+. In the end of P2, 10% of CON+ birds had pasty vent (PV). CON- increased incidence of PV and CON-VC aggravated this effect (P < 0.05), whereas CON-EW did not differ from CON+. CON- diet reduced proportion of 16S rDNA in colon digesta (P = 0.049), while CON-EW and CON-VC did not differ from CON+. Compared to CON-, CON-EW tended to decrease (P = 0.072) incidence of PV. Ceca were heavier (P < 0.05) in CON-EW than in CON+ fed birds. In conclusion, the challenge diet induced PV and reduced bacterial 16S rDNA in colon digesta, likely due to soluble NSP-induced anti-nutritive effects. VC supplementation enhanced early growth by increasing feed intake. Provision of EW did not impact performance but decreased incidence of PV and increased cecal size, suggesting that potential inoculation with beneficial microorganisms may counteract NSP effects.
我们研究了给肉鸡投喂蚯蚓（EW）或蚯蚓堆肥（VC）是否能提高其生产性能，并有助于应对富含可溶性非淀粉多糖（NSP）的日粮（阴性对照日粮；CON-）带来的日粮挑战。新孵化的雄性科宝500肉鸡（N = 480）被饲喂正对照日粮（CON+，n = 240），或在CON+中添加1%的EW（CON+EW；n = 120）或1%的干物质VC（CON+VC；n = 120），为期8天（第1阶段；P1）。在P1结束时，从每组一半的鸡身上采集血液和肠道样本。CON+组中剩余的一半鸡继续饲喂CON+，持续8天（P2；第9 - 16天），或换成CON-日粮。P1阶段CON+EW和CON+VC组的鸡在P2阶段换成CON-日粮（分别为CON-EW和CON-VC）。CON+VC组通过提高采食量（FI）（P < 0.05），在P1阶段提高了体重（BW）和平均日增重（ADG）（P < 0.05）, 但对饲料转化率（FCR）没有影响。在P1阶段，CON+EW组在生长和采食量方面与CON+组没有差异。在P2阶段，与CON+组相比，CON-日粮对生长或干物质采食量没有影响。在P2阶段结束时，10%的CON+组鸡出现糊肛（PV）。CON-日粮增加了PV的发生率，CON-VC组加剧了这种影响（P < 0.05），而CON-EW组与CON+组没有差异。CON-日粮降低了结肠内容物中16S rDNA的比例（P = 0.049）, 而CON-EW组和CON-VC组与CON+组没有差异。与CON-组相比，CON-EW组的PV发生率有降低的趋势（P = 0.072）。CON-EW组的盲肠比CON+组的鸡更重（P < 0.05）。总之，挑战性日粮导致了PV，并降低了结肠内容物中细菌16S rDNA的含量，这可能是由于可溶性NSP诱导的抗营养作用。添加VC通过增加采食量提高了早期生长性能。投喂EW对生产性能没有影响，但降低了PV的发生率，并增加了盲肠大小，这表明接种有益微生物可能抵消NSP的影响。
