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Grain Particle Size

Grain particle size is one of the primary factors that dictate starch digestibility in both ruminant and mono-gastric animals. Grain that is not processed well enough results in slow or incomplete digestion and low feed efficiency.  Grain particle size can be measured accurately and precisely by utilizing the method descrived in ASAE S319.4, which includes Ro-Tap shaking through a set of 14 sieves with various sized apetures.

U.S. Sieve # Micron Opening


6 3350
8 2360
12 1700
16 1180
20 850
30 600
40 425
50 300
70 212
100 150
140 106
200 75
270 53
Pan 45


A Grain Particle Size report will include the weight and percentage of the same retained on each sieve as well as calculations of the Mean Particle Size (MPS) and 1 Standard Deviation Distribution.  Typical MPS values found for various processing methods are as follows:

Feed Grain MPS
Fine Ground - Dry Corn <750
Medium Grind - Cry Corn 750-1000
Coarse Ground - Dry Corn >1000
Whole - Dry Corn >4000
Fine Ground - High Moisture Corn <1000
Coarse Grind - High Moisture Corn 1000-2500
Rolled - High Moisture Corn 1000-2500
Coarse Rolled - High Moisture Corn >2500
Whole - High Moisture Corn >4000
Snaplage 750-2000


Prolamin content and extent of fermentation can also have a significant effect on the digestion of starch in ruminants.  UW Grain 2.0 incorporates grain particle size, prolamin, and the extent of fermentation to give an accurate estimate of digestibility.















For more information call Dairyland Laboratories, Inc. at 608-323-2123 or contact us here.