BSE/TSE/Scrapie

Despite the very low risk of BSE to New Zealand, the New Zealand industry in close consultation with the government agencies to constantly review and improve the measures that are in place to ensure they are of the highest standards.

New Zealand is recognized as free from scrapie by the European Commission. Scrapie was detected in imported sheep in the 1950s when the disease was eradicated by slaughtering and disposing of all in-contact sheep and resting or destocking pastures. Another incident occurred in the 1970s when the sheep concerned were still held in quarantine. The animals were euthanased and their carcasses burnt.

BSE has never been reported or recorded in NZ.

Since 1952, the Ministry of Agriculture and Forestry has undertaken surveillance for Scrapie.

Since 1990, the Ministry of Agriculture and Forestry has undertaken active surveillance for scrapie, BSE and chronic wasting disease in deer.

Since the mid 1950s, only Australian meat and bone meal that has been heat-treated and accompanied by a valid import permit, has been permitted entry to New Zealand. N.B Australia is also free of BSE and scrapie. This material was not imported for use as feed.

The absence of scrapie, BSE and New Zealand's grass-fed, pasture-based farming systems ensures there is an extremely low likelihood of BSE entering the cattle population, simply because cattle are not feed formulated rations in feed lots. This fact is recognised by the EU Scientific Steering Committee which has categorised New Zealand highly unlikely to have cattle clinically or pre-clinically infected with BSE. .

In addition a voluntary ban was introduced on the feeding of ruminant-derived protein except milk for calves to all ruminants. This was followed by comprehensive legislation banning the feeding of ruminant protein to ruminants including spreading of meat and bone meal on pasture as fertilizer, which took effect from 1 Jan 2000.

Since 1990, the Ministry of Agriculture's active surveillance program has included:

• In 1988, a retrospective study of fixed adult bovine brain sections held in animal pathology laboratories was under taken for histopathological evidence of BSE. A total of 50 brains was examined and no lesions were found suggestive of BSE.
• An active education program to inform veterinarians, farmers and others of the clinical signs associated with TSEs
• A financial credit to those who submit for laboratory examination brains from sheep, goats, cattle or deer exhibiting signs of progressive central nervous system disease. From 1996 to 2000 almost 700 brains have been tested under such a program with no evidence of any TSE being found.
• Monitoring of the 13 cattle imported from the UK between 1982 and 1988. All are now dead.
• From January 1990 to December 2002 diagnostic vets screened 6,576 cases presenting clinical signs of nervous disease in cattle. In 1998 an additional 1,009 brains for clinically normal cattle aged 4 years and older were screen for histopathological lesions of BSE. None were found.

Yes. But under strict import protocols designed to prevent the entry of new or harmful organisms. More commonly New Zealand imports germ plasm such as semen or embryos where 'washing' techniques and other import requirements allow them to be imported safely.

BSE, which occurs in adult cattle, is one of a group of brain wasting diseases (known as transmissible spongiform encephalopathies or TSEs). It was was first identified in Britain in 1986. The disease has an incubation period of 3-5 years. Brain cells develop holes resulting in the loss of control of limbs, trembling, wide-eyed staring, swaying of the head, and erratic behaviour including charging, hence the term 'mad cow disease'.

New Zealand's farmers use grass-fed, pasture-based management systems.

New Zealand has never allowed the importation of meat and bone meal for feeding to livestock.

In addition, on 1 January 2000 a legislated ban became effective on the feeding of ruminant-derived meat and bone meal to all ruminants.

The absence of scrapie and New Zealand's grass-fed, pasture-based farming systems ensures there is an extremely low likelihood of BSE entering the cattle population.

Other TSEs include chronic wasting disease (CWD) that occurs in deer and elk, and TME, or transmissible mink encephalopathy, which occurs rarely in mink.

In July 2000, the EU Scientific Steering Committee (EU SSC) published the results of a 'Geographical BSE-Risk Assessment' of 24 countries including New Zealand which was classified in Category 1, the lowest risk category (lowest risk being the highest achievable category) along with Australia, Norway, Paraguay, Argentina, and Chile. The assessment rated the 'likelihood' that live cattle could be clinically or pre-clinically infected with the BSE agent. The EU SSC again assessed New Zealand's Geographical BSE risk in 2002 the report published in November 2002 again classified NZ as Category 1.

Under the EU SSC assessment the US and Canada are Category 2, i.e. "unlikely but not excluded." A case of BSE has subsequently been detected in Canada in May 2003.

New Zealand's livestock populations are free from TSEs - scrapie in sheep and goats, BSE in cows and CWD in deer.

New Zealand surveillance includes the collection and analysis of heads from cattle, sheep and farmed deer exhibiting signs of nervous disorder or other signs suggestive of a TSE.. A bounty is paid to vets and farmers by MAF to supply the heads and clinical history. Government vets routinely assess all livestock slaughtered in New Zealand meat plants for signs of any nervous disorder. The brains of those exhibiting any such signs are tested. New Zealand has met the OIE standards for testing. In addition to the regular testing, in 1998, the brains of 1,009 clinically normal cattle aged 4 years and over were examined for histopathological lesions of BSE. Sheep numbers tested are less than 40 per annum because insufficient animals exhibiting signs suggestive of scrapie are notified to MAF.

BSE has never been discovered in New Zealand and this country is internationally recognized as free from scrapie. However, because of international consumer concerns over BSE generally, MAF is currently having discussions with the farming and meat industries to strategically reevaluate its systems of surveillance and would consider adopting any 'best practice systems' which might be identified which would enhance NZ assurances of TSE freedom.

It is anticipated that measures under discussion will insure that each year the number of cattle brains examined meets the international standard. Testing of ruminant rations for ruminant proteins to ensure compliance with the ruminant protein regulations is also likely.