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IN a paper published in Veterinary Record in March last year, Bidewell and others (2012) highlighted the susceptibility of dry Jersey cows in a mixed herd to pre- and post-haemolytic copper poisoning (HCP). The authors speculated that an abrupt change of diet to barley straw for ‘drying off’ may have been a predisposing factor.
In our own study of a pure Jersey herd receiving more supplementary copper, particularly during the dry period (41 or 46 mg Cu/kg dry matter [DM] v 20 mg Cu/kg DM) (Hunter and other 2013), there was no evidence of either pre- or post-HCP in dry or lactating cows, before or after intervention. Supplementary …
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