Effectiveness of xylanase and Saccharomyces cerevisiae as feed additives on gas emissions from agricultural calf farms

Abstract

a b s t r a c tThe aim of the present study was to evaluate the potential of supplementing calves' diets with exogenous enzymes (xylanase; XYL) and yeast (Saccharomyces cerevisiae [SC]) on the sustainable control of methane (CH 4 ) and carbon dioxide (CO 2 ) productions in agricultural calves farming. Three different levels of supplemented diets of XYL (0, 3 and 6 mg/g of dry matter (DM)), SC (0, 2 and 4 mg/g of DM) and mixture of XYL and SC (0, 2 mL XYL þ 2 mg SC, 6 mL XYL þ 4 mg SC/g of DM) were tested. Asymptotic gas production (GP) consistently decreased by each of the additives with the lowest value at the high dose of XYL þ SC mixture (P < 0.05) compared with the control and the low dose of XYL þ SC mixture. Methane production was reduced by additives inclusion (P < 0.05) when compared with the control treatment with no additive. Xylanase þ SC at all doses increased CO 2 production (P < 0.05) whereas the high dose had the most statistically significant (P < 0.05) reduction in GP and CH 4 production compared with control, XYL and SC additives at different doses. Interaction between additive and rumen liquor was observed for rate of GP (P ¼ 0.027) and initial delay before GP (P < 0.001). Inclusion of XYL, SC, and XYL þ SC mixture had less asymptotic GP while XYL þ SC mixture had the lowest initial delay (39%) before GP began. The XYL þ SC had the lowest rate of CH 4 production (9%) and highest asymptotic CO 2 production (81%). The findings of this study indicate that inclusion of XYL or SC additives can improve rumen fermentation and reduce greenhouse gases production. The study also established that the mixture of XYL and SC is more efficient in reducing gas and CH 4 emissions for cleaner environmental production conditions in calf farming.

June-2020

“…Authors used the probiotic Aspergillus oryzae, and CH 4 production decreased in the experimental group due to the reduction of the protozoal population (45%). These findings are consistent with those of Hernández et al [31] that have used rumen inoculum of 60 day-old calves supplemented with S. cerevisiae (0, 2, and 4 mg/g of dry matter) and incubated it for 70 h. These results support our findings; a significant reduction of the amount of CH 4 and CO 2 in calves which received synbiotic consisting of prebiotic inulin and probiotic S. cerevisiae was observed.…”

Impact of inulin and yeast containing synbiotic on calves' productivity and greenhouse gas production

“…These findings are consistent with those of Hernández et al . [ 31 ] that have used rumen inoculum of 60 day-old calves supplemented with S. cerevisiae (0, 2, and 4 mg/g of dry matter) and incubated it for 70 h. These results support our findings; a significant reduction of the amount of CH 4 and CO 2 in calves which received synbiotic consisting of prebiotic inulin and probiotic S. cerevisiae was observed.…”

Chlorella vulgaris microalgae in Ruminant Nutrition: a Review of the Chemical Composition and Nutritive Value

“…Ruminants are one of the major producers of CH4 (Elghandour et al, 2017;Hernández et al, 2017). Supplementation of microalgae with high-fat feed showed positive effects as possible candidates to reduce CH4 production in ruminants (Gomaa et al, 2018) due to lipids, especially poly unsaturated fatty acids (PUFA), that have antimicrobial effects on ruminal methanogens and protozoa (Ebeid et al, 2020).…”