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Dynamics of the ruminal microbial ecosystem, and inhibition of methanogenesis and propiogenesis in response to nitrate feeding to Holstein calves

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Animal Nutrition 2021年第4期7卷 1205-1218页

作者： Abimael Ortiz-Chura jose gere Gisela Marcoppido Gustavo Depetris Silvio Cravero Claudia Faverin Cesar Pinares-Patino Angel Cataldi d Maria E.Ceron-Cucchi Institute of Pathobiology CICVyA National Institute of Agricultural TechnologyIPVetUEDD INTA-CONICETHurlinghamC1686Argentina Engineering Research and Development Division National Technological University(UTN)National Scientific and Technical Research Council(CONICET)Buenos AiresC1179Argentina Agricultural Experimental Station of Balcarce National Institute of Agricultural Technology(INTA)BalcarceB7620Argentina Institute of Agrobiotechnology and Molecular Biology IABIMONational Institute of Agricultural Technology(INTA)National Scientific and Technical Research Council(CONICET)HurlinghamC1686Argentina The Agribusiness Group Lincoln UniversityPO Box 85016Lincoln7674New Zealand

It is known that nitrate inhibits ruminal methanogenesis,mainly through competition with hydrogenotrophic methanogens for available hydrogen(H2)and also through toxic effects on the ***,there is limited knowledge about its effects on the others members of ruminal microbiota and their *** this study,we investigated the effects of dietary nitrate inclusion on enteric methane(CH4)emission,temporal changes in ruminal microbiota,and fermentation in Holstein *** animals were maintained in individual pens for 45 *** were randomly allocated to either a control(CTR)or nitrate(NIT,containing 15 g of calcium nitrate/kg dry matter)*** emissions were estimated using the sulfur hexafluoride(SF6)tracer *** microbiota changes and ruminal fermentation were evaluated at 0,4,and 8 h *** this study,feed dry matter intake(DMI)did not differ between dietary treatments(P>0.05).Diets containing NIT reduced CH4 emissions by 27%(g/d)and yield by 21%(g/kg DMI)compared to the CTR(P0.05)but differed with time,and post-feeding(P<0.05).Increases in the concentrations of ruminal ammonia nitrogen(NH3-N)and acetate were observed,whereas propionate decreased at 4 h post-feeding with the NIT diet(P<0.05).Feeding the NIT diet reduced the populations of total bacteria,total methanogens,Ruminococcus albus and Ruminococcus flavefaciens,and the abundance of Succiniclasticum,Coprococcus,Treponema,Shuttlewortia,Succinivibrio,Sharpea,Pseudobutyrivibrio,and Selenomona(P<0.05);whereas,the population of total fungi,protozoa,Fibrobacter succinogenes,Atopobium and Erysipelotrichaceae L7 AE11 increased(P<0.05).In conclusion,feeding nitrate reduces enteric CH4 emissions and the methanogens population,whereas it decreases the propionate concentration and the abundance of bacteria involved in the succinate and acrylate pathways.D

关键词： Methane emission Nitrate Microbiota Ruminal fermentation

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