Education
- Ph.D.,
University of Kentucky, 1974
- M.S., University of Kentucky, 1972
- B.S., Iowa State University, 1969
Research Interests
- Swine systems
management
- Segregated
early weaning in swine
- Composting
livestock mortalities
Outreach Programs
- Ongoing
farm visits and consultations
- Represent the Southern Experiment Station in directing and hosting the
University of Minnesota Pork Conference
- Host field days at the Southern Experiment Station
Awards
Minnesota
Honorary State FFA Degree, 1992
Affiliations
Links
Southern
Research and Outreach Center
Publications
- Refereed Articles -
Johnston,
L.J., J.E. Pettigrew, and R.D. Walker. 1998. Effect of sucrose/milk
chocolate product (MCP) blend on feed intake and performance of lactating
sows. J. Anim. Sci. 76: Suppl. 2, No. 89.
Yang,
H., J.A. Kerber, J.E. Pettigrew, L.J. Johnston, and RD Walker. 1997.
Evaluation of milk chocolate product as a substitute for whey in pig
starter diets. J. Anim. Sci. 75:423.
Richert,
B.T., M.D. Tokach, R.D. Goodband, J.L. Nelssen, J.E. Pettigrew, R.D.
Walker, and L.J. Johnston. 1996. Valine requirement of the high producing
sow. J. Anim. Sci. 74:1307.
Augenstein,
M.L., L.J. Johnston, J.E. Pettigrew, R.D. Walker, and R. Rose. 1995.
Use of ethylamine in simple starter diets to improve utilization of
soybean meal by newly weaned pigs. J. Anim. Sci. 73:Suppl. 1. p. 71.
Johnston,
L.J., J.E. Pettigrew, M.E. Wilson, R.D. Walker, and B. Crooker. 1995.
Influence of dietary molasses on reproductive performance of lactating
sows. University of Minnesota: Recent Advances of Swine Production and
Health. Vol. 5, p. 15.
Mankell,
K.O., K.A. Janni, R.D. Walker, ME Wilson, J.E. Pettigrew, L.D. Jacobson,
and W.F. Wilcke. 1995. Dust suppression in swine feed using soybean
oil. J. Anim. Sci. 73:981.
Yang,
H., J.A. Kerber, J.E. Pettigrew, L.J. Johnston, and R.D. Walker. 1995.
Evaluation of milk chocolate product as a substitute for whey in pig
starter diets. J. Anim. Sci. 73:Suppl. 1. p. 76.
Johnston,
L.J., J.E. Pettigrew, M.E. Wilson, R.D. Walker, and B.S. Crooker. 1994.
Influence of dietary molasses on reproductive performance of lactating
sows. J. Anim. Sci. Vol. 72(Suppl. 1) p. 334.
Mankell,
K.O., K.A. Janni, R.D. Walker, M.E. Wilson, J.E. Pettigrew, L.D. Jacobson,
and W.F. Wilcke. 1994. Dust suppression in swine feed using soybean
oil. J. Anim. Sci. Suppl. 1. Vol. 72 p. 42.
Richert,
B.T., R.D. Goodband, M.D. Tokach, J.L. Nellsen, L.J. Johnston, R.D.
Walker, J.E. Pettigrew, and S.A. Blum. 1994. Determining the valine
requirement of high producing sows. J. Anim. Sci. Vol. 72(Suppl. 1)
p. 389.
Walker,
R.D., G.C. Shurson, and J.E. Pettigrew. 1994. An evaluation of choice
feeding in grow-finish pigs separated by sex. J. Anim. Sci. Vol. 72
(Midwestern Section) p. 61.
Walker,
R.D. and B.S. Wiseman. 1994. Growth performance of segregated early
weaned (SEW) pigs compared to their conventionally weaned littermates.
J. Anim. Sci. Vol. 72(Suppl. 1) p. 376.
- Proceedings and Invited Lectures -
Drum, S.,
R.D. Walker, M. Mellencamp, and W. Marsh. 1997. Do benefits from SEW
continue through finishing? 1997 Swine Day Proc. p 51-65. University
of Minnesota.
Drum,
S., R.D. Walker, W.E. Marsh, and M.A. Mellencamp, 1996. Effects of segregated
early weaning on growth performance of pigs from nursery to slaughter.
Conf. of Research Workers in Animal Diseases, Chicago, IL.
Walker,
R.D. 1995. Segregated early weaning and finishing pig performance. 1995
Swine Day Proc. p 2-14. University of Minnesota.
Pettigrew,
J.E., R.D. Walker, and M.E. White. 1995. The early weaned pig: The role
of age at weaning, health status and diet. Canadian Society of Animal
Science, 1995 conf., Ottawa, Canada.
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