Plasma protein is known to increase feed intake and growth rate in the first week following weaning (Coffey and Cromwell, 1995) although these benefits are not always evident some weeks later (Nessmith, et al., 1997). However, as most UK food retailers demand the exclusion of same species animal products from livestock diets, plasma products are excluded from UK piglet diets even though they are commonly used in several EU countries. The benefits of plasma protein are thought to result from its immunoglobulin content therefore alternative sources of specific immunoglobulins may be equally beneficial. One such source is egg protein derived from hens which have been vaccinated against specific pig pathogens (Kichura, 1997) eg Protimax (DuCoa, USA). The aims of this experiment were to estimate the potential loss of efficiency in the UK by the exclusion of porcine plasma protein from weaner diets and to determine whether egg protein containing specific immunoglubulins could produce similar piglet performance to plasma protein.