Abstract
This study aimed to evaluate the in vitro degradation and total gas production of different oil seed press cakes from a biodiesel production chain gas through the use of a semi-automatic technique of gas production in vitro. The treatments consisted of substituting elephant grass in increasing levels, 0%, 30, 50 and 70%, with the byproducts of Gossyypium hirsutum, Ricinus communis, Moringa oleifeira, Jatropha curcas and Helianthus annus. The oil seed press cakes of Moringa oleifeira had the highest rate of in vitro degradation of dry matter compared with other foods but did not result in a higher final volume of gases production. Gossyypium hirsutum, Pinhao manso curcas and Ricinus communis showed a higher in vitro degradability of similar dry matter. The highest total gas production was obtained by the oil seed press cakes of Helianthus annus. The oil seed press cakes of Moringa oleifeira can replace elephant grass up to 70% and therefore reduce both greenhouse gas emissions and energy loss for the animal.
Highlights
Research involving the production of greenhouse gases has globally increased because of alterations in the ozone layer and its influence on human health (Giger-Reverdin et al, 2002)
We aimed to evaluate the use of several byproducts of the biodiesel production chain through in vitro ruminal degradability testing using the gas production technique
After milling in a Wiley mill (1.0 mm screen perforations at 105°C), we determined the dry matter (DM) content and crude protein (CP), according to the Kjeldahl method according to the general procedures described by AOAC (2005); neutral detergent fiber (NDF), and acid detergent fiber (ADF) according to the method of (Van Soest et al, 1991), acid detergent lignin (ADL) and ether extract (EE) were determined using an ANKOM®XT10 system
Summary
Research involving the production of greenhouse gases has globally increased because of alterations in the ozone layer and its influence on human health (Giger-Reverdin et al, 2002). Brazil has the world’s second largest cattle herd and has signed the Kyoto Protocol; the country monitors the amount of greenhouse gases produced by the national herd. The introduction of nonconventional foods with characteristics that favor an amelioration in greenhouse gases levels and reduce environmental impacts are. In addition to environmental aspects is the economic aspect in which Brazil, a large amount of agricultural byproducts are produced, and agribusiness products with potential use in animal feeding, especially those from the biodiesel chain (pies and sharps), can be used as sources of nutrients for animals for immediately degradation in the rumen (Muller & Aubert, 2014).
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