Published online by Cambridge University Press: 27 February 2018
The slaughter of animals for human consumption leads to the production of a large quantity of materials which with further processing can be converted into a form suitable for use in animal feedingstuffs. Currently, much of this material goes to waste because of the fragmentation of the abattoir industry into many small units (1700). This means that it is often uneconomic to transport by-products to central points for further processing. However, more stringent control of effluents from abattoirs and the need for high capital investment to bring units up to newly imposed standards means that slaughterings will be concentrated into fewer and larger units (250) (Gerrard and Mallion, 1977), so making the collection and further processing of waste more attractive from both the economic and environmental standpoint. Within the UK, some 13 to 13.5 million cattle units are slaughtered per year (Table 1). (1 cattle unit = 1 beast or 2 pigs, or 3 calves, or 5 lambs).