E.F. Annison,     Department of Animal Husbandry; University of Sydney; Camden, New South Wales 2570; Australia

D.G. Armstrong,     Department of Agricultural Biochemistry and Nutrition; University of Newcastle Upon Tyne; Newcastle-Upon-Tyne NE1 7RU; England

W. Barej,     Department of Animal Physiology; Warsaw Agricultural University; Warsaw, Poland

T.N. Barry,     Department of Animal Science; Massey University; Palmerston North, New Zealand

E.N. Bergman,     Department of Physiology, Biochemistry, and Pharmacology; New York State Veterinary College; Cornell University; Ithaca, New York 14850; U. S. A.

G. Breves,     Institute of Animal Nutrition; Federal Agricultural Research Centre; Bundesallee 50; D-3300, Braunschweig; Germany

G.A. Broderick,     U. S. Dairy Forage Research Center; 1925 Linden Drive West; University of Wisconsin; Madison, Wisconsin 53705; U. S. A.

D.H. Carr,     Department of Physiology and Anatomy; Massey University; Palmerston North, New Zealand

N. Chaiyabutr,     Department of Physiology; Faculty of Veterinary Science; Chulalongkorn University; Henri Durant Rd.; Bangkok 10500; Thailand

K.-J. Cheng,     Livestock Sciences Section; Agriculture Canada Research Station; Lethbridge; Alberta T1J 4B1; Canada

R.J. Christopherson,     Department of Animal Science; University of Alberta, Edmonton; Alberta T6G 2P5; Canada

R.G. Clark,     Animal Health Laboratory; Ministry of Agriculture and Fisheries; Private Bag, Mosgiel; New Zealand

J.W. Costerton,     Department of Biological Sciences; University of Calgary; Calgary; Alberta T2N IN4; Canada

D.F. Cottrell,     Department of Preclinical Veterinary Sciences; University of Edinburgh; Summerhall; Edinburgh EH9 1QH; Scotland

K. Dahlborn,     Department of Animal Physiology; Swedish University of Agriculture Sciences; P.O. Box 7045, S-750 07 Uppsala; Sweden

D.W. Dellow,     Biotechnology Division; DSIR; Private Bag, Palmerston North; New Zealand

D. Demeyer,     Research Center for Nutrition; Animal Husbandry and Meat Technology; State University of Ghent; 9230 Melle; Belgium

M. Durand,     Station de Recherches de Nutrition; INRA; 78 350 Jouy-en-Josas; France

W. von Engelhardt,     Department of Physiology; School of Veterinary Medicine; Bischofsholer Damm 15; D-3000 Hannover 1; Germany

L. Eriksson,     Department of Physiology; College of Veterinary Medicine; Helsinki; Finland

G. Fonty,     Laboratoire de Microbiologie; INRA; Centre de Clermont-Ferrand Theix; 63122 Ceyrat; France

C.W. Forsberg,     Department of Microbiology; University of Guelph; Guelph, Ontario N1G 2W1; Canada

G. Gäebel,     Institute for Veterinary Physiology; Free University Berlin; Koserstr. 20; d-1000 Berlin 33; Germany

P. Gálfi,     Department of Physiology; University of Veterinary Sciences; P.O. Box 2; H-1400 Budapest; Hungary

M.L. Galyean,     Clayton Livestock Research Center; New Mexico State University; Route 1; Box 109; Clayton, New Mexico 88415; U. S. A.

H.J. Gilbert,     Department of Agricultural Biochemistry and Nutrition; University of Newcastle Upon Tyne; Newcastle-Upon-Tyne NE1 7RU; England

N.D. Grace,     Biotechnology Division; DSIR; Private Bag, Palmerston North; New Zealand

K. Gregg,     Department of Biochemistry, Microbiology, and Nutrition; University of New England; Armidale, New South Wales 2351; Australia

P.C. Gregory,     Kalichemie A. G.; Pharmacology Division; Hans-Bocklep-Allee 20; P.O. Box 220; D-3000 Hannover 1; Germany

P.M. Harris,     Biotechnology Division; DSIR; Private Bag, Palmerston North; New Zealand

T. Hino,     Department of Animal Science; Faculty of Agriculture; Meiji University; Tama-ku, Kawasaki 214; Japan

I.D. Hume,     School of Biological Sciences; University of Sydney; Sydney, New South Wales 2006; Australia

K.N. Joblin,     Biotechnology Division; DSIR; Private Bag, Palmerston North; New Zealand

H.D. Johnson,     Laboratory of Environmental Physiology; Department of Dairy Science; University of Missouri; Columbia, Missouri 65201; U. S. A.

J.P. Jouany,     Unite Digestion Microbienne; INRA; Centre de Clermont-Ferrand Theix; 63122 Ceyrat; France

B.E. Karlberg,     Clinical Research Centre; Department of Internal Medicine; University Hospital, Linköping; Sweden

M. Kaske,     Department of Physiology; School of Veterinary Medicine; Bischofsholer Damm 15; D-3000 Hannover 1; Germany

S. Kato,     Department of Veterinary Physiology; Rakuno Gakuen University; Ebetsu 069; Japan

K. Katoh,     Department of Animal Physiology; Faculty of Agriculture; Tohoku University; Sendai 981; Japan

R.N. B. Kay,     Rowett Research Institute; Bucksburn; Aberdeen AB2 9SB; Scotland

P. Langer,     Department of Anatomy and Cytobiology; Justus-Liebig-Universität Glessen; Aulweg 123; 6300 Glessen; Germany

M. Lechner-Doll,     Department of Physiology; School of Veterinary Medicine; Bischofsholer Damm 15; D-3000 Hannover 1; Germany

B.F. Leek,     Department of Veterinary Physiology and Biochemistry; University College Dublin; Veterinary College of Ireland; Dublin 4; Ireland

R.A. Leng,     Department of Biochemistry, Microbiology, and Nutrition; University of New England; Armidale, New South Wales 2351; Australia

G.E. Lobley,     Rowett Research Institute; Bucksburn; Aberdeen AB2 9SB; Scotland

A.S. I. Loudon,     Zoological Society of London; Institute of Zoology; Regent’s Park; London NW1 4RY; England

H. Martens,     Department of Physiology; School of Veterinary Medicine; Bischofsholer Damm 15; D-3000 Hannover 1; Germany

G.H. McDowell,     School of Agriculture; La Trobe University; Bundoora; Victoria 3083; Australia

L.M. McLeay,     Department of Biological Sciences; University of Waikato; Hamilton; New Zealand

J.A....