Effects of copper supplementation on the copper status of peripartum beef cows and their calves.

摘要: The effects of copper supplementation on the status 40 late-pregnant Aubrac beef cows grazing a copper-deficient pasture and later fed marginally deficient diet were studied for five months. They divided into four equal groups; control group received no supplement, groups 1 2 as sulphate at 10 30 mg/kg dry matter (DM), respectively, months, 3 120 days. Plasma concentration activity erythrocyte superoxide dismutase (esoD) measured beginning experiment, in calves during weeks after calving, before they turned out to mean (sd) age 51 (26) In spite low dietary content (4.2 DM), plasma increased winter. All supplements resulted normal similar concentrations but decreased slightly between calving supplemented treatments did not affect eSOD cows. born showed same patterns esoD. Compared with cows, had week values range 3; their esoD was high 3.