Effects of supplemental source of magnesium and inclusion of buffer on ruminal microbial fermentation in continuous culture

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dc.creatorArce Cordero, José Alberto
dc.creatorRavelo, Anay D.
dc.creatorVinyard, James R.
dc.creatorMonteiro, Hugo Fernando
dc.creatorAgustinho, Bruno Calvo
dc.creatorSarmikasoglou, Efstathios
dc.creatorBennett, Sarah L.
dc.creatorFaciola, Antonio Pinheiro
dc.date.accessioned2023-06-19T17:49:07Z
dc.date.available2023-06-19T17:49:07Z
dc.date.issued2021-07
dc.descriptionJosé Alberto Arce Cordero realizó esta publicación durante un programa de doctorado patrocinado por la Universidad de Costa Ricaes_ES
dc.description.abstractMagnesium oxide (MgO) is the most common supple mental source of Mg for dairy cows and a proven ruminal alkalizer when supplemented above NRC (2001) recommendations. However, overfeeding MgO may increase feeding costs, whereas the effects of alternative sources of Mg on ruminal fermentation are not well known. Moreover, it is still unclear if Mg supplementation influences the effects of bicarbonate-based buffers on ruminal fermentation. We aimed to evaluate the effect of Mg source on ruminal fermentation with diets formulated to a final concentration of 0.25% Mg, and to determine if the effect of sodium sesquicarbonate as a buffer varies with the source of Mg. We used 8 fermentors in a duplicated 4 × 4 Latin square design with a 2 × 2 factorial arrangement of treatments, by combining 2 factors: (1) Mg source: using either MgO or an alternative source consisting of a blend of CaMg(OH)4 and CaMg(CO3)2 (BLN) and (2) sodium sesquicarbonate buffer inclusion, at 0 or 0.6% of dry matter intake. Based on preliminary tests of reactivity, we hypoth esized that BLN plus buffer would allow for greater ruminal pH, acetate molar proportion, and NDF digestibility than diets with MgO or without buffer. Four 10-d periods were completed, where the last 3 d were used for pH measurements and collection of samples for volatile fatty acids (VFA), ammonia (NH3-N), Mg solubility, N metabolism, and nutrient digestibility. Effects of Mg source (source), sodium sesquicarbonate inclusion (buffer), and their interaction (source × buffer) were tested with the MIXED procedure of SAS (SAS Institute Inc.). We did not find an effect of Mg source on ruminal fermentation variables; however, concentration of soluble Mg in ruminal fluid was greater for MgO compared with BLN. On the other hand, buffer supplementation increased average ruminal pH, acetate molar proportion, and branched-chain VFA molar proportion; tended to increase NDF digestibility; and decreased both area under the curve and time below pH 6.0. An interaction of source × buffer was found for propionate, butyrate, and NH3-N, the first one decreasing and the 2 others increasing only when buffer was supplemented to the BLN diet. Our results indicate that supplementing Mg with either MgO or BLN promotes similar ruminal fermentation in diets with total concentration of 0.25% Mg. Further evaluations are needed to assess Mg availability and animal performance in dairy cows fed BLN.es_ES
dc.description.procedenceUCR::Vicerrectoría de Docencia::Ciencias Agroalimentarias::Facultad de Ciencias Agroalimentarias::Escuela de Zootecniaes_ES
dc.description.sponsorshipUniversidad de Costa Rica/[]/UCR/Costa Ricaes_ES
dc.identifier.citationhttps://www.journalofdairyscience.org/article/S0022-0302(21)00551-8/fulltextes_ES
dc.identifier.doi10.3168/jds.2020-20020
dc.identifier.issn7820-7829
dc.identifier.urihttps://hdl.handle.net/10669/89489
dc.language.isoenges_ES
dc.rightsacceso abierto
dc.sourceJournal of Dairy Science, Vol.104(7), pp. 7820-7829es_ES
dc.subjectAlkalizeres_ES
dc.subjectIn vitroes_ES
dc.subjectpHes_ES
dc.titleEffects of supplemental source of magnesium and inclusion of buffer on ruminal microbial fermentation in continuous culturees_ES
dc.typeartículo originales_ES

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