Pig International - January/February 2017 - 24

24 ❙ PigInternational

Practical
grinding
guidelines for
pig feeds
The particle size of ground grain
or feed performs a critical role
in determining feed digestibility,
mixing performance, and pelleting
efficiency and quality.
BY GIANNIS KARVELIS

There is much discussion among farmers and consultants about reducing costs while preserving performance or improving it. The end point of most of
these discussions ends up being closely related to feed
conversion rate or feed formulation as relating to individual raw materials costs. As feed represents about
70 to 80 percent of overall production cost, it is not
surprising that any factor associated with its efficiency
of use and raw material makeup and costs should be at
the heart of our attention. 

of the raw material by improving protein and energy
digestibility, its mixing characteristics by reducing segregation with other ingredients in the mix, and the pelleting efficiency and pellet quality and durability.
Since all cereal grains will need to undergo some
kind of processing (hammer mill or roller mill), why
not spend some time monitoring the particle size
and the particle size distribution of the end product
and/or its component cereals depending on the final
physical form (pellet or meal) offered to the pig? And
do remember, too fine a
particle size is also something to avoid.

LIKE HUMANS, PIGS BENEFIT in terms of
enhanced digestibility when their feed is ground.
In practical and real terms, cereals are the major
energy source for pigs (and poultry), and to achieve
their best utilization, the aim in the first instance is to
mechanically reduce their particle size before they are
offered to the animal. A reduced particle size of a grain
increases its available surface area for the digestive
enzymes to interact. This improves the nutritional value

Defining particle size

First, let's discuss how exactly particle size is defined. In simple terms, feed particle size refers to the
average mean diameter of individual particles of feed
or simply the fineness of grind of the feed. The average
geometric particle size (dgw) as well as the geometric
standard deviation (Sgw) is being estimated using equations available in several articles, but personally I
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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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