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Effects of calcium–magnesium carbonate and calcium–magnesium hydroxide as supplemental sources of magnesium on microbial fermentation in a dual-flow continuous culture

dc.creatorArce Cordero, José Alberto
dc.creatorMonteiro, Hugo Fernando
dc.creatorBrandao, Virginia. L. N.
dc.creatorDai, Xin
dc.creatorBennett, Sarah L.
dc.creatorFaciola, Antonio Pinheiro
dc.date.accessioned2023-06-19T17:52:42Z
dc.date.available2023-06-19T17:52:42Z
dc.date.issued2020-12-22
dc.descriptionLa Universidad de Costa Rica apoyó el programa de doctorado de José Alberto Arce Corderoes_ES
dc.description.abstractSupplemental sources of Mg can also aid in ruminal pH regulation due to their al kaline properties. Magnesium oxide (MgO) is the most common source of Mg for ruminants and can help controlling ruminal pH; however, the al kaline potential of other sources of Mg has not been evaluated. We aimed to evaluate the inclusion of calcium–magnesium carbonate (CaMg(CO3 )2 ) and calcium–magnesium hydroxide (CaMg(OH)4 ) alone or in combination as supplemental sources of Mg in corn silage-based diets and its impact on ruminal microbial fermentation. We hypothe sized that inclusion of CaMg(OH)4 would allow for ruminal fermentation conditions resulting in a greater pH compared to the inclusion of CaMg(CO3 )2 . Four treatments were defined by the supplemental source of Mg in the diet: 1) Control (100% MgO, plus sodium sesquicarbonate as a buffer); 2) CO3 [100% CaMg(CO3 )2 ]; 3) OH [100% CaMg(OH)4 ]; and 4) CO3 /OH [50% Mg from CaMg(CO3 )2 , 50% Mg from CaMg(OH)4 ]. Nutrient concentration was held constant across treatments (16% CP, 30% NDF, 1.66 Mcal NEl/ kg, 0.67% Ca, and 0.21% Mg). Four fermenters were used in a 4 × 4 Latin square design with four periods of 10 d each. Samples were collected for analyses of nutrient digestibility, soluble Mg, VFA, and NH3 , while pH was measured at 0, 1, 2, 4, 6, 8, and 10 h post morning feeding to estimate % time when pH was below 6 (pH-B6) and area under the pH curve for pH below 6.0 (pH-AUC). Bacteria pellets were harvested for 15N analysis and estimates of N metabolism. Treatment ef fects were analyzed with the mixed procedure of SAS, while effects of using either CaMg(CO3 )2 or CaMg(OH)4 as Mg source in comparison to Control treatment were evaluated by orthog onal contrasts. Similar pH-related variables were observed for Control, OH, and CO3 /OH treat ments, which had smaller pH-AUC and pH-B6 than CO3 (P ≤ 0.01). Butyrate molar proportion was greater in Control and CO3 /OH than in CO3 and OH (P = 0.04). Orthogonal contrasts showed lower flow of bacterial N (P = 0.04), lower bu tyrate molar proportion (P = 0.08) and greater pH-AUC (P = 0.05) for diets with CaMg(CO3 )2 in comparison with the Control. Concentration of soluble Mg in ruminal fluid (P = 0.73) and nu trient digestibility (P ≥ 0.52) were similar across treatments. Under the conditions of this experi ment, using CaMg(OH)4 alone or combined with CaMg(CO3 )2 allowed for a less acidic rumi nal fermentation pattern than a diet with only CaMg(CO3 )2 .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://academic.oup.com/tas/article/5/1/txaa229/6043306es_ES
dc.identifier.doi10.1093/tas/txaa229
dc.identifier.issn2573-2102
dc.identifier.urihttps://hdl.handle.net/10669/89490
dc.language.isoenges_ES
dc.rightsacceso abierto
dc.sourceTranslational Animal Science, Vol.5(3), pp. 1-13es_ES
dc.subjectAlkalinizeres_ES
dc.subjectBufferes_ES
dc.subjectMINERALes_ES
dc.subjectRuminal acidosises_ES
dc.titleEffects of calcium–magnesium carbonate and calcium–magnesium hydroxide as supplemental sources of magnesium on microbial fermentation in a dual-flow continuous culturees_ES
dc.typeartículo originales_ES

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