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ARPAS Spring 2023 Newsletter

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Published on Monday, April 29, 2019

ACAS Elections – Voting Opens May 1

The 2019 ACAS elections will be open May 1 to 30, 2019. An email notification will be sent to all ACAS members with information about the 2019 nominees and how to cast a vote.

The 2019 nominees

ACAS President-Elect

  • Bruce Arentson
  • Jim Chapman

ACAS Secretary

  • Ron Lemenager
  • Terry Engle

Bruce Arentson, PhD, Dipl. ACAN

Bruce Arentson grew up on a general livestock and grain farm in western Iowa and graduated from Iowa State University with a BS in animal science and MS and PhD degrees in animal nutrition. Prior to joining the Pet Specialty Division of Mars Petcare, he worked for Protein Blenders as an animal nutritionist for 5 years and then Kent Nutrition Group for 20 years, where he formulated branded products for swine, poultry, and equine; conducted swine feeding trials; and provided technical service for these species. In addition to nutritional scientist, he was regulatory manager for the Kent Nutrition Group, overseeing labels for medicated feeds and ensuring the company was compliant with the appropriate state and federal regulations. He also interacted with state feed control and FDA officials with issues associated with the company.

His involvement with professional associations includes the following:

  • ASAS member since 1980,
  • AFIA Regulatory Committee for a decade and chaired the committee for two years, and
  • Iowa Feed and Nutrition Seminar for 20 years and involved in planning programming for meetings for several years.

Arentson joined Mars Petcare in October 2010 as a senior formulation scientist for the Nutro brand. Nutro pet products are marketed as natural pet products and sold in pet specialty stores. In 2018 his responsibilities changed to senior formulation scientist for the dry pet Mars Global Innovation Center with responsibilities to provide technical expertise that will influence global pet care’s formulation capabilities and directions needed to meet the business goals and future visions. Arentson and Joanne, his wife, live in Franklin, Tennessee. Their three adult children are married and live in Texas, Missouri, and Iowa, respectively, and thus provide their parents opportunities to travel. Arentson and Joanne enjoy gardening together and experimenting in the kitchen. Arentson also enjoys maintaining a fitness regimen that includes biking and running.

Jim Chapman, PhD, Dipl. ACAN, ACAP

Jim Chapman earned BS and MS degrees in animal science and animal physiology from Texas Tech University in 1970 and 1975, respectively, and a PhD from the University of Georgia in ruminant physiology and nutrition in 1978. In 1980, after a post-doctorate appointment at North Carolina State University, Chapman accepted a teaching and research faculty position at West Texas State University in the College of Agriculture. From 1986 to 1989 and 2000 to 2002, Chapman worked for two commercial feed additive companies as a regional technical service manager and director of technical development, respectively. Between 1989 and 2000 Chapman held positions as dairy nutritionist and director of nutrition for a privately owned feed company in Florida. In 2002 Chapman joined the Phibro Animal Health Nutritional Specialty Products Division. During his tenure within Phibro, he has held positions as ruminant nutritionist, dairy technology manager, and director of research and technical services and currently holds the position of senior research leader for collaborative research. Chapman’s responsibilities have included supervision of field trials and institutional research, product development, and technical support to marketing and sales. Chapman has served on advisory boards and committees for the Florida Ruminant Nutrition Symposia, SE Dairy Management Conference, and the ARPAS Ethics Committee and as secretary/treasurer for ACAS. Chapman has authored and coauthored over 70 technical articles, peer-reviewed publications, and popular-press articles. Chapman is a member of ADSA, ASAS, AAAS, TANC, ARPAS, and Sigma Xi. Chapman and his wife reside in Saint Simons Island, Georgia.

Ronald P. Lemenager, PhD, PAS

Dr. Ron Lemenager received his degrees from the University of Illinois (B.S.) and Oklahoma State University (M.S., Ph.D.). He has made his career with a three-way appointment in research, teaching, and Extension at Purdue University where he specializes in beef cattle nutrition and management.

Dr. Lemenager’s research has focused on answering real world (relevant) questions facing producers in Indiana with a national appeal. Examples are work conducted on net energy requirements of beef cows to change weight and body condition; limiting access time to large round bales to stretch forage supplies and minimize waste; using distiller’s grains and by-products to improve reproductive efficiency in both the supplemented cow and her female offspring (fetal and lactational programming); addressing challenges in maintaining replacement heifer pregnancies when bred on early season pastures; and evaluation of modifications to estrous synchronizing strategies to maximize conception rates. His research expertise in beef female nutrition x reproduction interaction resulted in his committee appointment to develop the 8th Revised Edition Nutrient Requirements of Beef Cattle, 2016 National Academy of Science, Engineering and Medicine.

In Extension, he has developed and utilized his research program to answer applied, producer relevant questions. He has used a variety of learning technologies targeted toward beef producers within the state and around the country (blog, websites, web-TV, videos, fact sheets, webinars, and face-to-face meetings) and has been an invited speaker at state and national meetings across the country. Example programs with national appeal include the,, and, as well authorship of 15 chapters in three books, and over 75 refereed publications, 100 abstracts, and 25 proceedings papers supported by over $5M dollars in grants. Dr. Lemenager has been recognized by the Purdue University Cooperative Extension Service Association (three different Team Awards, a Special Award, and the Career Award), the Indiana Beef Cattle Association (Friend of the Industry Award, Outstanding Service Award, and Outstanding Cattleman Award) as well as a Charter Diplomat in the American College of Animal Nutrition.

In teaching, Dr. Lemenager has taught Applied Animal Nutrition; a senior-level, critical-thinking, scenario-based, capstone class in Beef Management; and is a popular guest speaker in both Animal Science and College of Veterinary Medicine classes. He has been the recipient of the College of Agriculture and Purdue University Outstanding Teacher, as well as Counselor Awards; was inducted into the Purdue University Book of Great Teachers; and received the Midwest ASAS Teaching Award. Additionally, he has served as President of both Midwest ASAS and the National Block and Bridle Club.

Terry Engle, PhD

Terry Engle is professor in the Department of Animal Sciences at Colorado State University. Engle’s teaching responsibilities include Vitamin and Mineral Metabolism and Animal Metabolism. His research interests include trace mineral metabolism in ruminants, with primary emphasis on the role of trace minerals and other nutrients on immune response, disease resistance, and lipid metabolism. Further research interests include molecular aspects of mineral absorption in ruminants.

Engle graduated from Colorado State University with both his BS (1993) and MS (1996) in animal science and earned his PhD (1999) in nutrition from North Carolina State University. Engle then returned to Colorado State University, at which he has been teaching since 1999.

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