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The strike follows a breakdown in negotiations for better pay and conditions earlier in the year.
Valley Vets, which is owned by VetPartners, offered a 7.27% increase to its lowest paid staff, with smaller increases for higher paid staff.
However, the BVU rejected the offer, describing it as a "derisory real terms pay cut".
A postal ballot was held and 94% of members voted for industrial action, with a 93% turnout.
The BVU says it is open to restarting negotiations in the hope that an improved offer will make the strike unnecessary.
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