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Now the Government has introduced a BSE Testing System toreplace one of the controls that has banned cattle aged over 30 months from the food chain. This aims to ensure the continuinghigh level of protection of consumers in the UK.esearch shows that, by the most likely estimates, the risk from BSEtesting of older cattle, instead of banning them completely, willresult in less than one additional case of vCJD occurring in humansover the next 60 years. The worst-case scenario is that there couldbe 2.5 additional cases.
After the first heat, about 25 to 30% of cows have a short cycle. A normal cycle lasts 19 to 23 days in beef cattle. However, short cycles last only 12 to 15 days. During short cycles progesterone, the hormone that supports pregnancy, does not stay elevated for enough days to allow implantation to occur. In 70 to 80% of beef cows, there is a brief (2 to 8 day) increase in progesterone that occurs before the first heat (Figure 1).