Biogas production: litter from broilers receiving direct-fed microbials and an enzyme blend

Made available in DSpace on 2018-11-26T17:06:17Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-09-01. Added 1 bitstream(s) on 2021-07-15T15:01:30Z : No. of bitstreams: 1 S0103-90162016000500406.pdf: 150918 bytes, checksum: d1c8fe2b77b88c580f36c63da500ce93 (MD5) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) The effect of additives used in the feed of broilers on anaerobic bio-digestion of poultry litter was evaluated. Four diets were used: NC: negative control; DFM: NC + 500 ppm direct-fed microbials (DFM) containing Bacillus subtilis and Bacillus licheniformis; ENZ: diet formulated with an enzyme blend (20 ppm phytase, 200 ppm protease and 200 ppm xylanase); DFM+E: ENZ + DFM. Substrates for the anaerobic bio-digestion were prepared with litter from each treatment, containing 4 % total solids (TS). These were used in 16 continuous bio-digesters with a 2 kg d(-1) load, to determine the production and potential biogas production and composition during an 85-day period. Influent and effluent samples were collected for the amounts of TS and volatile solids (VS), fiber fraction (neutral detergent fiber [NDF], acid detergent fiber [ADF] and lignin), nutrients (N, P and K), and total and thermotolerant coliforms to be determined. For all treatments a reduction in the following effluents was observed as follows: TS (49, 48, 48 and 50 %) VS (70, 54, 55 and 62 %) NDF (91, 90, 95 and 96 %) ADF (89, 88, 93 and 94 %) and lignin (80, 76, 89 and 88 %). The efficiency of the treatment for coliforms in bio-digesters was higher than 90 % in the 85-day period in all treatment groups. There was a reduction in biogas and methane production when DFM (5500 and 4000 mL) and DFM + E (5800 and 4100 mL) were used, compared to treatments NC (6300 mL and 4400) and ENZ (6400 and 4500 mL). The potential production of reduced TS and VS was higher in ENZ (1: 00 and 1.74 106 mL kg(-1)) when compared to NC (0.88 and 1: 02 106 mL kg(-1)), DFM (0.80 and 1:40 106 mL kg(-1)) and DFM + E (0.88 1: 25 and 106 mL kg(-1)). The additives did not affect the percentage of methane production, and all treatments showed values higher than 70 %. Adding enzymes to the diet of broilers influences the litter characteristics and, as a consequence, increases biogas production. The addition of DFM and DFM + E to broiler diets reduced biogas and methane production. Sao Paulo State Univ, FMVZ, Dept Nutr & Anim Prod, Av Duque de Caxias 225, BR-13635900 Pirassununga, SP, Brazil Fed Univ Grande Dourados, Sch Agr Sci, Rod Dourados Itahum,Km 12,Unidade II,CP 364, BR-79804970 Dourados, MS, Brazil DSM Nutr Prod, Av Eng Billings,1729 Predio 31, BR-05321010 Sao Paulo, SP, Brazil Sao Paulo State Univ, FCAV, Dept Anim Morphol & Physiol, Via Acesso Prof Paulo Donato Castellane S-N, BR-14884900 Jaboticabal, SP, Brazil Fed Univ Grande Dourados, Sch Business Adm Acconting & Econ Sci, Dourados, MS, Brazil Sao Paulo State Univ, FMVZ, Dept Nutr & Anim Prod, Av Duque de Caxias 225, BR-13635900 Pirassununga, SP, Brazil Sao Paulo State Univ, FCAV, Dept Anim Morphol & Physiol, Via Acesso Prof Paulo Donato Castellane S-N, BR-14884900 Jaboticabal, SP, Brazil FAPESP: 2010/05263-1 FAPESP: 2010/11329-5