Pig International - January/February 2017 - 26

26 ❙ PigInternational
PRACTICAL GRINDING GUIDELINES

Particle size analysis, real example
(ASTM C C136/C136M-14)
Sample: 24704 Finishers 50-80 Kg

Tested by:

Date: 3/6/2016

Date: 2/6/2016

Test number: 030616-1

Date: 8/6/2016

Sample weight (start)

M1

851.1

g

Sample weight (end)

M2

849.1

g

Mass franction <75 μm

P+M1-M2

2.4

g

Franction rate <75μm

f

0.3

%

Sieve number Diameter (mm) Soil retained (g) Soil retained (%)

Mass of sieve
Particle size
& soil (g)
Soil passing (%) (equations)

No. 4

4.75

0

0

851.1

100

No. 8

2.36

23.4

2.8

827.7

97.3

2.367

No. 10

2

33.6

4

794.1

93.3

2.744

No. 16

1.18

182.1

21.5

612

71.9

3.551

No. 30

0.6

251.8

29.7

360.2

42.3

-15.154

No. 40

0.43

222.7

26.2

137.5

16.2

-22.45

No. 50

0.3

76.1

9

61.4

7.2

-10.794

No. 70

0.21

45.7

5.4

15.7

1.8

-8.352

No. 100

0.15

9.2

1.1

6.5

0.8

-2.056

No. 200

0.08

3.8

0.4

2.7

0.3

-1.16

0.4

0

TOTAL:

-0.513

848.8

0.599

A practical example of particle size analysis.
size (which is a common marker
very well-known and accepted from
the majority of home mixers and
feed producers), particle size distribution is of equal importance.
Trials done with finishing pigs
fed a corn-soybean-meal-based diet
(either in meal or pellet form) with
the corn milled to particle sizes of
1,000, 800, 600 or 400 microns resulted in 5 percent greater ADG and
7 percent greater grain/feed between
the two extremes.
Pelleted feed increased DM

and nitrogen digestibility by 5 to 8
percent. In other recent trials, reducing the particle size of the mixed
feed from 1,000 to 400 microns
increased gain/feed by 8 percent and
digestibility of GE by 7 percent.
Improved nutrient digestibility and
lower ADFI resulted in 26 percent less daily excretion of DM and
27 percent less daily excretion of N
in the feces as particle size was reduced from 1,000 to 400 microns.
On the other hand, reducing particle size increased electrical energy

required for milling and decreased
milling production rates, especially
as particle size was decreased from
600 to 400 microns.
On a commercial basis, all the
above could be interpreted to dgw of
600-700 microns and Sgw of 1.5-2.0.
I am always referring to the desired
average particle size for all type of
feeds, as it is quite uncommon and
definitely unpractical for small scale
farms to produce feeds according to
the type of animal they are intended.
These goals should be enough to

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Table of Contents for the Digital Edition of Pig International - January/February 2017

Pig International - January/february 2017
Contents
Managing livestock antibiotic resistance with diagnostics
How to quantify health status in farm animals
6 major piglet diarrhea causes and their management
Boosting piglet immunity with colostrum
Practical grinding guidelines for pig feeds
How to train gilts for electronic sow feeding systems
Fermented liquid pig feed benefits outweigh drawbacks
5 new smart farming pig products from EuroTier
VIV Asia 2017 to represent entire animal protein chain
Pigs and Money
Industry Happenings
Products
Marketplace
Pig International - January/February 2017 - Pig International - January/february 2017
Pig International - January/February 2017 - Cover2
Pig International - January/February 2017 - Contents
Pig International - January/February 2017 - Pigs and Money
Pig International - January/February 2017 - Industry Happenings
Pig International - January/February 2017 - 5 new smart farming pig products from EuroTier
Pig International - January/February 2017 - 5
Pig International - January/February 2017 - 6
Pig International - January/February 2017 - 7
Pig International - January/February 2017 - 8
Pig International - January/February 2017 - 9
Pig International - January/February 2017 - Managing livestock antibiotic resistance with diagnostics
Pig International - January/February 2017 - 11
Pig International - January/February 2017 - 12
Pig International - January/February 2017 - 13
Pig International - January/February 2017 - How to quantify health status in farm animals
Pig International - January/February 2017 - 15
Pig International - January/February 2017 - 6 major piglet diarrhea causes and their management
Pig International - January/February 2017 - 17
Pig International - January/February 2017 - Boosting piglet immunity with colostrum
Pig International - January/February 2017 - 19
Pig International - January/February 2017 - 20
Pig International - January/February 2017 - 21
Pig International - January/February 2017 - 22
Pig International - January/February 2017 - VIV Asia 2017 to represent entire animal protein chain
Pig International - January/February 2017 - Practical grinding guidelines for pig feeds
Pig International - January/February 2017 - 25
Pig International - January/February 2017 - 26
Pig International - January/February 2017 - 27
Pig International - January/February 2017 - How to train gilts for electronic sow feeding systems
Pig International - January/February 2017 - 29
Pig International - January/February 2017 - 30
Pig International - January/February 2017 - 31
Pig International - January/February 2017 - Fermented liquid pig feed benefits outweigh drawbacks
Pig International - January/February 2017 - 33
Pig International - January/February 2017 - 34
Pig International - January/February 2017 - Products
Pig International - January/February 2017 - Marketplace
Pig International - January/February 2017 - Cover3
Pig International - January/February 2017 - Cover4
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