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Gallic acid alleviates the negative effect of Asparagopsis armata on milk yield in dairy cows
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Edité par CCSD ; Wageningen Academic Publishers -
Session 85. Climate care dairy farming: herd managementPrésentation orale. International audience. We have shown that when ruminal methanogenesis is inhibited in vitro, gallic act as a dihydrogen acceptor and improveruminal fermentation. In this work, we tested the effect of gallic acid and the methanogenesis inhibitor Asparagopsisarmata on dihydrogen emissions and milk production in dairy cows. Lactating Holstein cows (n=28) were separatedinto four treatment groups as follow: CON, basal hay:concentrate diet; AS, basal diet with 0.25% A. armata; GA,basal diet with 0.8% gallic acid; and MIX, basal diet with 0.25% A. armata and 0.8% gallic acid. This study used arandomized complete block design with 6 wk of covariate and 5 wk of experimental measurements. The AS treatmentdecreased methane yield by 25%, increased dihydrogen emissions threefold, and reduced the acetate to propionateratio in the rumen. In contrast, gallic acid did not affect methane or dihydrogen emissions, nor acetate or propionatemolar proportions. Feed intake decreased by 10% in the AS group with a consequent decrease in milk yield of 18%.In the MIX group, feed intake was also decreased (8%), but the drop in milk yield was less severe (11%). This studyconfirms the antimethanogenic effect of A.armata but also shows a negative effect on feed intake and milk yield.While gallic acid did not decrease dihydrogen loss, it partially alleviated the negative effect of A. armata on milk yield.
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