Sustainable anaerobic rumen methane and carbon dioxide productions from prickly pear cactus flour by organic acid salts addition

Abstract

Ruminal fermentation is accompanied by production of methane (CH 4) and carbon dioxide (CO 2) which are greenhouses making the Earth warmer. Therefore, the sustainable production of CH 4 and CO 2 as well as fermentation kinetics when corn grain (CG) was replaced with prickly pear cactus flour (PC) was investigated. Besides, the effect of different levels of organic acid salts (OAS) was studied. Three total mixed rations used as substrates were prepared where CG was replaced with PC at three levels (/kg): 0 g (Control), 75 g (PC75) or 150 g (PC150). The OAS was used at three levels: 0, 5 and 10 mg/g dry matter (DM) of substrates. Asymptotic gas (GP), CH 4 , and CO 2 productions as well as lag time had linear responses (P < 0.05) as PC level increased in the ration. Fractional rate of GP (P ¼ 0.007), GP, organic matter degradability, short chain fatty acid, and microbial biomass production (P < 0.001) were increased with increasing level of PC. Fermentation pH (P < 0.001), and DM degradability (P ¼ 0.0448) were linearly decreased as the PC level increased in the rations. Ration  OAS interaction did not affect fermentation kinetics, GP, CH 4 production and fermentation parameters. Prickly pear cactus flour at 150 g/kg DM inclusion level in ruminant ration has the potential to replace 60% of corn grain with enhanced fermentation and biodegradation efficiency in vitro; however, it increased CH 4 production, which cannot be an environmental friendly way of feeding livestock.

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

“…Elghandour et al (2016c) reported a decreased CO 2 production when corn grain was replaced with soybean hulls. Elghandour et al (2016d) observed that replacement of corn grain with prickly pear cactus increased CO 2 production. However, both experiments used the same organic acid addition, indicating that the observed different effect may be ration dependent.…”

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