ABSTRACT
Objective
Commercial dry and ground shelled corn is not a uniform feed. Geometric mean particle
size (GMPS; μm) has been related to rumen digestibility, but researchers have specifically
sourced or created varied particle size to assess relationships. Researchers have
not sourced corn from differing commercial feed manufacturers. The objectives of our
work were to assess variation in commercially ground corn sample particle size, prolamin
protein content, and in situ rumen starch digestibility. Further, our objective was
to relate prolamin protein and particle size measures to in situ rumen starch digestibility
for survey samples.
Materials and Methods
Commercial dry and ground shelled corn samples (n = 38) were collected from the eastern
and midwestern United States and analyzed for starch (% of DM), prolamin (% of DM),
GMPS, surface area (cm2∙g−1; SA), and in situ rumen starch digestibility (% of starch) following 0, 7, and 16
h of incubation in 3 cannulated, lactating dairy cattle. Survey data were analyzed
using multivariate methods to report correlations, and ANOVA was carried out between
starch, prolamin protein, and particle size relative to in situ rumen starch digestibility
measures using JMP v14.3 (SAS Institute Inc., Cary, NC).
Results and Discussion
Substantial variability was observed for particle size measures; GMPS (μm) = 715 ±
233 and surface area (cm2∙g−1) = 92.7 ± 20.8. Further, GMPS and surface area were related to in situ rumen starch
digestibility at 16 h (P < 0.01) and 7 h (P < 0.01), respectively.
Implications and Applications
This observation suggests that both the mean and SD around the mean should be accounted
for when evaluating commercial dry and ground shelled corn.
Key words
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Article info
Publication history
Accepted:
June 24,
2020
Received:
January 7,
2020
Footnotes
One of the authors works for Rock River Laboratory Inc., which provided funding. Minor contributions were received from Masters Choice Seed Corn. Representatives from Cooperative Feed Dealers, Landmark Services Cooperative, Medford Cooperative, and Masters Choice Seed Corn submitted samples to this project. The authors currently consult for Masters Choice Seed Corn; however, the consulting relationship did not exist when this study was conducted.
Identification
Copyright
© 2020 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
