Abstract
The effect of CuSO(4) on fermentation was studied in a continuously cultured rumen ecosystem. CuSO(4), introduced at a level of 50 mg/500 ml of culture volume twice daily, caused a marked inhibition of fermentation of concentrates. Fermentation of alfalfa hay was not inhibited by the same CuSO(4) concentration when the inoculum for the culture was obtained from a cow maintained on a normal concentrate ration. When the inoculum was from a cow on a high concentrate ration, hay fermentation was partially inhibited by CuSO(4). Concentrations of CuSO(4) that did not inhibit the fermentation of alfalfa hay or hay-concentrate mixtures caused preferential production of propionic acid and decreased production of methane.
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