CONCLUSIONS
The use of soybean hulls (15% of DM) in partial replacement of corn meal increased dietary fiber con-centration without affecting DMI, and milk production, and CH4 yield (g/kg of DMI). The high-starch diets tended to reduce CH4 intensity (expressed as g/kg of milk). Fish oil at the dosage tested (0.8% of DMI) tended to enhance milk yield and positively decreased the n-6:n-3 ratio of the milk PUFA, but did not reduce methane emission. However, in low-starch diets, the addition of FO seems promising in reducing CH4 intensity per kilogram of ECM. The use of FO as dietary lipid supplement is not advisable for high-starch diets due to the negative effect on milk fat. The surprising increase in NDF digestibility due to FO in corn silage-based diets deserves further study to determine the dynamics of the rumen microbial populations. Interestingly, the increase in NDF digestibility due to FO did not increase CH4 yield.
CONCLUSIONSThe use of soybean hulls (15% of DM) in partial replacement of corn meal increased dietary fiber con-centration without affecting DMI, and milk production, and CH4 yield (g/kg of DMI). The high-starch diets tended to reduce CH4 intensity (expressed as g/kg of milk). Fish oil at the dosage tested (0.8% of DMI) tended to enhance milk yield and positively decreased the n-6:n-3 ratio of the milk PUFA, but did not reduce methane emission. However, in low-starch diets, the addition of FO seems promising in reducing CH4 intensity per kilogram of ECM. The use of FO as dietary lipid supplement is not advisable for high-starch diets due to the negative effect on milk fat. The surprising increase in NDF digestibility due to FO in corn silage-based diets deserves further study to determine the dynamics of the rumen microbial populations. Interestingly, the increase in NDF digestibility due to FO did not increase CH4 yield.
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CONCLUSIONS
The use of soybean hulls (15% of DM) in partial replacement of corn meal increased dietary fiber con-centration without affecting DMI, and milk production, and CH4 yield (g/kg of DMI). The high-starch diets tended to reduce CH4 intensity (expressed as g/kg of milk). Fish oil at the dosage tested (0.8% of DMI) tended to enhance milk yield and positively decreased the n-6:n-3 ratio of the milk PUFA, but did not reduce methane emission. However, in low-starch diets, the addition of FO seems promising in reducing CH4 intensity per kilogram of ECM. The use of FO as dietary lipid supplement is not advisable for high-starch diets due to the negative effect on milk fat. The surprising increase in NDF digestibility due to FO in corn silage-based diets deserves further study to determine the dynamics of the rumen microbial populations. Interestingly, the increase in NDF digestibility due to FO did not increase CH4 yield.
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