The bluetongue vaccination programme is on schedule despite some delays in sending out further batches of vaccine.
Millions of vaccine doses have already been issued, but quality control testing has delayed the supply of one batch, according to Defra.
The delays are "unfortunate", a joint statement from the National Farmers Union and Country Land and Business Association in the East Midlands said.
The non-contagious virus, spread by midges, can cause fever and swelling.
Batch testing
The bluetongue protection zone stretches from Lincolnshire to the south of England.
The Department for Environment, Food and Rural Affairs (Defra) said there were 136 confirmed premises affected by Bluetongue in England in early June.
The Defra website said: "We are continuing to work closely with Intervet on determining the availability of the next batches of vaccine and the impact that this will have on the roll-out of vaccination.
"The next batch of vaccine, which has already been prepared, is undergoing rigorous quality control testing."
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