Liu Y.;C.D.Espinosa;J.J.Abelilla;G.A.Casas;L.V.Lagos;S.A.Lee;W.B.Kwon;J.K.Mathai;D.M.D.L.Navarro;N.W.Jaworski;H.H.Stein;Mathai;D.M.D.L.Navarro;N.W.Jaworski;H.H.Stein;Department of Animal Science,University of California;Department of Animal Sciences,University of Illinois;Trouw Nutrition;

Liu Y.%C.D.Espinosa%J.J.Abelilla%G.A.Casas%L.V.Lagos%S.A.Lee%W.B.Kwon%J.K.Mathai%D.M.D.L.Navarro%N.W.Jaworski%H.H.Stein%Mathai%D.M.D.L.Navarro%N.W.Jaworski%H.H.Stein%Department of Animal Science,University of California%Department of Animal Sciences,University of Illinois%Trouw Nutrition

non-antibiotic feed additives;;pigs;;yeast products;;nucleotides;;plant extracts

A number of feed additives are marketed to assist in boosting the pigs' immune system and reduce the negative impact of weaning and other environmental challenges.The most commonly used feed additives include acidifiers,zinc and copper,pre-biotics,direct fed microbials,yeast products,nucleotides,and plant extracts.Inclusion of pharmacological levels of zinc and copper,certain acidifiers,and several plant extracts have been demonstrated to result in improved pig performance or improved immune function of pigs.It is also possible that use of pre-biotics,direct fed microbials,yeast,and nucleotides may have positive impacts on pig performance,but results have been less consistent and there is a need for more research in this area.