An assessment of the copper status of dairy herds in the Waikato, Taranaki and Northland in spring and the effects of daily supplementation with copper sulphate.

摘要: Abstract The copper status of dairy herds in the Waikato, Taranaki and Northland regions between 1 August 30 September was assessed by determinations made on composite sera from ten cows each herd. Comparisons were two major groups categorised as “as received” “supplemented”. In latter, received 2.0–6.0 g/day sulphate orally late gestation to end lactation. Mean values determined pastures three soil types Waikato. lowest (134.3 μmol/kg) highest (173.3 μmol/kg). Calculated dietary available levels showed grown organic soils These also had high molybdenum levels. Serum (7.30 μmol/l), marginal folr both (9.91 μmol/l) Waikato (9.93 μmol/l). “supplemented” considerably ...