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Effects of dietary copper and molybdenum levels on liver and kidney minerals in holstein cattle



Effects of dietary copper and molybdenum levels on liver and kidney minerals in holstein cattle



Japanese Journal of Zootechnical Science 55(9): 670-676



The objective of this study was to clarify the effects of Cu and Mo levels in rations on the Cu and Mo status of Holstein cattle. Cu and Mo concentrations in 37 Holstein cattle kept at Kyushu National Agricultural Experiment Station, Japan and 10 dairy farms in Kumamoto prefecture [Japan] were investigated. Cu concentrations in the liver and kidney were 192-231 and 10-17 ppm, respectively, in 2 newborn and one 1 mo. old calves, but those in 14 cows were 4-170 and 14-22 ppm, respectively. Mo concentrations in the liver and kidney were 2.86-3.82 and 1.54-1.61 ppm, respectively, in 2 newborn calves, but those in 14 cows were 4.06-5.40 and 1.78-2.72 ppm, respectively. Liver Cu concentration in 5 cows was < 10 ppm, and severe diarrhea occurred in a lactating cow. Cu concentration in roughage was lower than that in concentrate, but Mo concentration in feed was below 1.2 ppm. Cu concentration in the liver, kidney, blood and feces was affected by dietary Cu level, but Mo concentration in the liver, kidney, blood and feces was not affected by dietary Mo level. It seems likely that Cu deficiency may occur after long periods of feeding low Cu diets, since Cu concentration in the liver decreased with reduced dietary Cu, and low Cu concentration in the liver was regarded as Cu deficiency in this study. It was not apparent that Cu deficiency was affected by dietary Mo level.

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