Meat and bone meal

Meat and bone meal (MBM) is a product of the rendering industry. It is typically about 48–52% protein, 33–35% ash, 8–12% fat, and 4–7% water. It is primarily used in the formulation of animal feed to improve the amino acid profile of the feed. Feeding of MBM to cattle is thought to have been responsible for the spread of BSE (mad cow disease); therefore, in most parts of the world, MBM is no longer allowed in feed for ruminant animals. However, it is still used to feed monogastric animals.
MBM is widely used in the United States as a low-cost animal protein in dog food and cat food. In Europe, some MBM is used as ingredients in pet food, but the majority is now used as a fossil-fuel replacement for energy generation, as a fuel in cement kilns, landfilling or incineration. MBM has around two thirds the energy value of fossil fuels such as coal; the UK in particular widely uses meat and bone meal for the generation of renewable electricity. This was particularly prominent after many cattle were slaughtered during the BSE crisis. Meat and bone meal is increasingly used in cement kilns as an environmentally sustainable replacement for coal.
History.
In the UK, after the 1987 discovery that BSE could cause vCJD, the original feed ban was introduced in 1988 to prevent ruminant protein being fed to ruminants. In addition, it has been illegal to feed ruminants with all forms of mammalian protein (with specific exceptions) since November 1994 and to feed any farmed livestock, including fish and horses, with mammalian meat and bone meal (mammalian MBM) since 4 April 1996. Regulation (EC) No.999/2001 introduced EU-wide regulations, which relaxed UK controls.
In 2000, UK supermarket chain Co-op Food was still calling for "a legally-binding Europe-wide ban on the feeding of animal waste to farm animals". They opined that the practice was tantamount to cannibalism. According to the BBC at the time there was no ban on the use in livestock feed of animal blood, tallow, poultry offal and feather meal.
European categories.
In Europe (before the 2002 EU Regulation), animal by-products were classified into two categories: "high risk" or "low risk" products. Since 2002, "processed animal protein" (PAP) and other animal by-products, authorized or not for various uses, are categorized into three categories (by the European Regulation 2002) according to their supposed or demonstrated level of health risk.
Detection.
A minimum of 500g is required to test samples of solid or liquid material at the Irish Equine Centre, an independent not-for-profit organisation. Tests are by light microscopy and using real-time PCR for ruminant DNA. The presence of MBM and fish products in feed can be tested by light microscopy in two days. The presence of ruminant DNA in feed by real-time PCR can be detected by this lab in 48 to 72 hours.