Abstract
Abstract The effect of avoparcin on the yield and composition of milk was assessed in two trials. Trial 1 involved 60 Friesian cows with half of the cows untreated as controls and half drenched daily with 125 mg avoparcin/cow for 14 weeks. Trial 2 involved 10 mixed-breed twin pairs. One member of each pair was untreated and the other was drenched daily with 150 mg avoparcin/cow for 12 weeks. In each trial the treatment period was preceded by a 2-week uniformity period. The cows grazed pastures containing ryegrass and white clover. Yields of milk and milk solids were significantly increased by avoparcin treatment in Trial 2 but not in Trial 1. There was no difference between the treatment groups in changes in liveweight or condition score over the treatment period. The effect of avoparcin on bloat was assessed in Trial 3. Three groups of 10 cows of high susceptibility to bloat were untreated (controls) or drenched once daily with either 100 or 150 mg avoparcin/cow for 29 days. The first 19 days were to all...
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