Journal of Food, Agriculture and Environment

Potential methane production from manure of cattle fed diet supplemented with wet brewery grain

Author(s):

Larissa Schmatz Mallmann, Maximiliane Alavarse Zambom, Douglas Guedes Torres Batista, Leiliane Cristine Souza, Jefferson Luiz Gonçalves Silva, Silvia Renata Machado Coelho, Simone Damasceno Gomes

Recieved Date: 2014-06-22, Accepted Date: 2014-09-30

Abstract:

This study aimed at evaluating the potential methane production from manure of cattle fed diets containing different levels of wet brewery grain to replace the forage in the diet, whose levels were 0, 20, 25 and 30% dry matter. Four steers fitted with a rumen cannula were assigned in a 4 × 4 Latin square design, in four 21 day-experimental periods (14 days for adaptation and 7 days for data collection). In the last week of each period, we collected the animal manure to conduct anaerobic digestion tests for 120 days. During this period, we evaluated the removal of total and volatile solids, removal of soluble chemical oxygen demand, daily and cumulative production of methane gas, production of volatile fatty acids (lactic, acetic, propionic and butyric), acidity/alkalinity ratio and pH of reactors. For statistical analysis, cumulative methane production curves were fitted according to the modified Gompertz model. Tukey’s test was applied to compare mean values with significance level of 5%. The treatment with the highest level of wet brewery grain showed higher potential methane production from manure; the inclusion of wet brewery grain did not affect the production of volatile fatty acids; the modified Gompertz model provided a good fit to the data of methane production.

Keywords:

Anaerobic digestion, volatile fatty acids, modified Gompertz, biodegradability, energy, ruminants

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 3&4
Category: Agriculture
Pages: 203-208

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