Abstract
Abstract A trial was undertaken to determine whether a bloat drench containing copper (Cu), cobalt (Co), selenium (Se), and iodine (I) would by‐pass the reticulo‐rumen (rumen) of cows. Six rumen‐fistulated cows were fed pasture at a range of intakes so that there was an 8‐fold range in rumen dry matter (DM) pool size, and the Cu in the drench was used as a marker. The extent to which the rumen Cu pool size increased as a consequence of drenching was used to indicate the fate of the drench. The increase in the rumen Cu pool with drenching showed 30–100% of the drench (mean 71.3 ± SE 5.15%) remained in the rumen 25–30 min after administration and recovery was not affected by rumen fill or saiety. It is suggested that the low and variable recoveries could be the result of a slow dispersion of drench in the digesta, so that drench which was concentrated in the cranial reticulo‐rumen passed rapidly to the abomasum. The drench did not appear to elicite a closure of the oesophageal groove.
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