Feed Strategy - March 2020 - 20

20 ❙ FeedStrategy

FEED ACADEMY
BY IOANNIS MAVROMICHALIS, PH.D.

Trustworthy dietary
specifications for feed formulation

H

aving selected a formulation software
and an ingredient database, it is time to
formulate some feeds. Now, it is time for
another long-term decision, namely the source of
dietary specifications.
A very simple example will illustrate the point. All
formulas need to have an energy specification; that
is, how much energy the feed contains. Let
us assume we are making a broiler feed
and we have selected AMEn as our
energy indicating parameter - this is
apparent metabolizable energy corrected
for zero nitrogen retention, but this was a
decision we had to make as part of the previous
course. Now, we need to indicate to the software
program how much AMEn our feed must contain. Will
this number be 3,000 kcal/kg, more, less, and who is
going to be the authority in providing this number? Of
course, the same applies to nutrients and all other specifications, but we are using energy as an example here.

Book values can be a starting point
Any good book on poultry nutrition will offer some

information on dietary specifications. So, for a
broiler feed program composed of a starter, a grower
and a finisher feed, this book might indicate 3,000,
3,050, and 3,100 kcal/kg AMEn for the three feeds,
respectively. Now, if you look at another book, of an
equally authoritative author, these values might be
2,950, 3,050, and 3,200 kcal/kg - and there might
be very good reason for that. The same pattern can
be observed as the number of sources increase.
We have several options here. First, we can
pick the book values we consider most trustworthy,
assuming we have enough experience to make this
distinction. Second, we can calculate an average
based on the most trustworthy sources. Third,
we can follow the same source as that we used to
establish our ingredient nutrient database. This last
option is what most starting feed professionals do
as they want to ensure the two sets of values are
related as closely as possible. Such is the case of the
NRC publications in the U.S., the INRA publications in France, and similar sets of values in other
countries. Following a public institution's values
gives some extra authority in our work.

Read blogs by Ioannis Mavromichalis:
www.feedstrategy.com/blogs/animal-nutrition-views/

vasabii | Shutterstock.com

Any feed is only as good as the data used to design it and finding
a source of trustworthy feed nutrient specifications is another
hurdle that needs to be addressed early on.

www.FeedStrategy.com ❙ March 2020

2003FSfeedacademy.indd 20

2/28/2020 1:42:08 PM


http://www.Shutterstock.com http://www.feedstrategy.com/blogs/animal-nutrition-views/ http://www.FeedStrategy.com

Feed Strategy - March 2020

Table of Contents for the Digital Edition of Feed Strategy - March 2020

Feed Strategy - March 2020
Contents
In the Mix
Industry Happenings
2020 Poultry Nutrition & Feed Survey: Poultry feed balances cost with market demands
Indian poultry to gain from food sector modernization
ASF, food trends, technology will leave their mark in 2020
Trustworthy dietary specifications for feed formulation
6 alternative energy sources for broilers
Vietnam’s feed industry sees market shifts, modernization
Mineral nutrition update for US pig feeds
Advertisers’ Index
Feed Strategy - March 2020 - Feed Strategy - March 2020
Feed Strategy - March 2020 - Cover2
Feed Strategy - March 2020 - Contents
Feed Strategy - March 2020 - In the Mix
Feed Strategy - March 2020 - Industry Happenings
Feed Strategy - March 2020 - 2020 Poultry Nutrition & Feed Survey: Poultry feed balances cost with market demands
Feed Strategy - March 2020 - 5
Feed Strategy - March 2020 - 6
Feed Strategy - March 2020 - 7
Feed Strategy - March 2020 - 8
Feed Strategy - March 2020 - 9
Feed Strategy - March 2020 - 10
Feed Strategy - March 2020 - 11
Feed Strategy - March 2020 - 12
Feed Strategy - March 2020 - 13
Feed Strategy - March 2020 - Indian poultry to gain from food sector modernization
Feed Strategy - March 2020 - 15
Feed Strategy - March 2020 - ASF, food trends, technology will leave their mark in 2020
Feed Strategy - March 2020 - 17
Feed Strategy - March 2020 - 18
Feed Strategy - March 2020 - 19
Feed Strategy - March 2020 - Trustworthy dietary specifications for feed formulation
Feed Strategy - March 2020 - 21
Feed Strategy - March 2020 - 22
Feed Strategy - March 2020 - 23
Feed Strategy - March 2020 - 6 alternative energy sources for broilers
Feed Strategy - March 2020 - 25
Feed Strategy - March 2020 - 26
Feed Strategy - March 2020 - 27
Feed Strategy - March 2020 - Vietnam’s feed industry sees market shifts, modernization
Feed Strategy - March 2020 - 29
Feed Strategy - March 2020 - 30
Feed Strategy - March 2020 - 31
Feed Strategy - March 2020 - Mineral nutrition update for US pig feeds
Feed Strategy - March 2020 - 33
Feed Strategy - March 2020 - 34
Feed Strategy - March 2020 - 35
Feed Strategy - March 2020 - 36
Feed Strategy - March 2020 - 37
Feed Strategy - March 2020 - 38
Feed Strategy - March 2020 - 39
Feed Strategy - March 2020 - Advertisers’ Index
Feed Strategy - March 2020 - Cover3
Feed Strategy - March 2020 - Cover4
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