Emergency controls on the export of live animals are to come into force after the first outbreak of foot-and-mouth disease for 20 years.
The British Government has announced the controls on animal exports along with restrictions on meat, milk and other animal products.
Agriculture Minister Baroness Hayman has told the Lords controls on the movement of livestock in a five-mile area around the source of the outbreak are in place.
The outbreak is centred around an abattoir near Brentwood, in Essex.
In a statement, she has urged farmers to be vigilant for signs of the disease elsewhere in the country and pledged that ministers would take all necessary steps to control the disease.
"As those who remember (the last outbreak in) 1967 will know, a widespread outbreak of foot-and-mouth disease can be extremely serious for the whole of the farming community," Lady Hayman warned.