Petfood Forum Guide - 2018 - 15
Repletion of pea protein concentrate protein quality with spraydried egg and amino acids
Spencer Smith*, Greg Aldrich, Ingmar Middelbos; Kansas State University;
Introduction of novel protein sources has had a considerable influence in new
product growth in the pet food industry. Ingredients like pea protein concentrate
have been used in pet diets with success, but knowledge of their shortcomings
are limited. The objective of this study was to evaluate the protein quality of pea
protein concentrate through a repletion strategy in a chick growth assay.
Experimental diets contained 10 percent crude protein from ingredients [spraydried granulated egg (SDG), pea protein concentrate 50 percent (PPC50), pea
protein concentrate 72 percent (PPC72), pea protein concentrate 50 percent + DL
methionine (PPC50 + MET), 20:80 SDG:PPC50 (2080PPC50), 40:60 SDG:PPC50 (4060PPC50), 20:80 SDG:PPC72 (2080PPC72) and 40:60 SDG:PPC72
(4060PPC72)]. A nitrogen-free diet was also fed to serve as a negative control
(NEG). Chicks were fed the experimental diets for 10 days. There were six chicks
per pen with four pens per treatment, and the collective pen weight was relatively
equal for all treatments (912.4 ± 5.7 g). The protein efficiency ratio (PER) of each
treatment was calculated as weight gain (g) per protein intake (g). The PER of SDG
Thank you to those who provided
their expertise in reviewing the
submitted abstracts for our Petfood
Forum Student Program:
Greg Aldrich, PhD; research associate
professor, Kansas State University
Bob Annan; consulting, Extru-Tech Inc.
Thomas Barber; vice president of process
engineering, Bühler Aeroglide
Melissa Brookshire, DVM; founder, North
Gary Davenport, PhD; companion animal technical manager, ADM Animal Nutrition
George Fahey, PhD; professor emeritus,
University of Illinois
Kris Figge; senior technical sales & service
manager, AFB International
Kadri Koppel; assistant professor, Kansas
Jim Mann; principal technical services &
product manager, Kemin Nutrisurance
Franck Peron, DVM, MSc, PhD, DipECAWBM; ethologist, Diana Pet Food
was higher (P<0.05) than all other treatments, with the exception of 4060PPC50
(5.35 vs. 4.85, respectively). The PER values for 4060PPC72 and PPC50 + MET
were not different (4.50; 4.26; P>0.05) from each other or 4060PPC50, but were
higher (P<0.05) than 2080PPC72 and 2080PPC50 (3.36 and 3.11, respectively).
The PPC50 and PPC72 did not differ from each other and had the lowest PER value
of all treatments (P<0.05; average 1.66). The repletion of pea protein concentrate
with egg and (or) DL methionine improved protein quality but not completely.
Thus, it would appear that a second limiting amino acid may be needed to fully
compliment the protein quality of pea protein.
Spencer Smith is a graduate research assistant at Kansas State University
originally from Overland Park, Kansas, USA. She is currently working on her
Master of Science degree in the Pet Food program studying under Dr. Greg Aldrich.
She received her Bachelor of Science degree in Agriculture from Kansas State
University with an emphasis on monogastric nutrition. Her master's research has
focused on the use of plant-based proteins such as corn gluten meal, soybean
meal and distillers dried grains in dry dog and cat foods. Smith will graduate in
May of 2019 and then hopes to pursue a career in product development.
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