Feed Strategy - February 2018 - 32

32 ❙ FeedStrategy
NIRS FORAGE AND FEED ANALYSIS

Silage calibration database
DM (%)

DVAL
ME
WSC Starch
LA
VFA
(%) (MJ/kg) CP (%) NDF (%) ADF (%) (%)
(%) (g/kg) (g/kg)

Grass silage

38.03

70.9

11.35

16.5 44.71

26.5

5.7

0

Corn silage

22.9

78.9

12.64

6.8

37.9

25.75

0

48.3

3.95

Calculated mixed
mean (FM)

30.46

74.9

11.995

11.7

41.31

26.13

2.85

24.15

43.73 14.65

Calculated mixed
mean (DM)

32.34

73.9

11.84

12.9 42.15 26.22 3.56

18.16

53.6

Mixed by corn database

34.03

76.8

12.29

7.99 36.63

0

39

4.39

70.4

11.27

14.7 48.07 26.71

5.7

0

61.66 29.57

Mixed by grass database 35.1

26.4

Ash
(%)

83.51 29.29 8.31
0

3.91
6.11

18.28 6.66
0

4.42
7.04

Source: Davies

Predictions of silage sample constituents with NIRS using different calibration databases.
■ % Sugars (for corn and whole

crop include starch)
■ % Lactic acid (LA)

■ % Volatile fatty acids (VFA)

If they add up to less than 85 percent, it's advisable to ask for the sample

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to be re-analyzed. If values are given as
g/kg DM rather than percentage, then
divide values by 10 before summing.
For none of these parameters should
negative values be reported.
As previously mentioned, calibration is the key: the NIRS database must be relevant to the sample
analyzed. Often, this is not the case;
either inappropriate forages or forages from the wrong geographical
region have been used to create
the calibration database. Climate,
weather conditions and farming
practice all affect fiber degradability
and the relative quantities of the
fractions comprising the forage.
One reason appropriate calibration samples are crucial is that NIRS
doesn't follow the Beer-Lambert law,
i.e., it is not an additive: You cannot
take a prediction for one forage and
add it to a prediction from a different
forage and use it to predict the value
from a mixture of the two. The table,
"NIR silage sample calibration datawww.WATTAgNet.com ❙ February 2018


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Table of Contents for the Digital Edition of Feed Strategy - February 2018

Feed Strategy - February 2018
Contents
Livestock premixes evolve to meet consumer demands
6 alternative protein sources to soybean meal
Insect proteins inch toward approval for EU animal feed
How to improve the effi ciency of corn-soy poultry diets
5 feeding strategies to combat piglet diarrhea
Basics of NIRS forage and feed analysis for dairy feed
Feed formulation software enhances effi ciency, profi ts
VICTAM Asia to showcase latest in feed, food industries
In the Mix
Products
Marketplace
Advertisers’ Index
Feed Strategy - February 2018 - CT1
Feed Strategy - February 2018 - CT2
Feed Strategy - February 2018 - Feed Strategy - February 2018
Feed Strategy - February 2018 - Cover2
Feed Strategy - February 2018 - Contents
Feed Strategy - February 2018 - In the Mix
Feed Strategy - February 2018 - 3
Feed Strategy - February 2018 - 4
Feed Strategy - February 2018 - 5
Feed Strategy - February 2018 - Livestock premixes evolve to meet consumer demands
Feed Strategy - February 2018 - 7
Feed Strategy - February 2018 - 8
Feed Strategy - February 2018 - 9
Feed Strategy - February 2018 - 6 alternative protein sources to soybean meal
Feed Strategy - February 2018 - 11
Feed Strategy - February 2018 - 12
Feed Strategy - February 2018 - 13
Feed Strategy - February 2018 - 14
Feed Strategy - February 2018 - 15
Feed Strategy - February 2018 - Insect proteins inch toward approval for EU animal feed
Feed Strategy - February 2018 - 17
Feed Strategy - February 2018 - 18
Feed Strategy - February 2018 - 19
Feed Strategy - February 2018 - How to improve the effi ciency of corn-soy poultry diets
Feed Strategy - February 2018 - 21
Feed Strategy - February 2018 - 22
Feed Strategy - February 2018 - 23
Feed Strategy - February 2018 - 24
Feed Strategy - February 2018 - 25
Feed Strategy - February 2018 - 5 feeding strategies to combat piglet diarrhea
Feed Strategy - February 2018 - 27
Feed Strategy - February 2018 - 28
Feed Strategy - February 2018 - 29
Feed Strategy - February 2018 - Basics of NIRS forage and feed analysis for dairy feed
Feed Strategy - February 2018 - 31
Feed Strategy - February 2018 - 32
Feed Strategy - February 2018 - 33
Feed Strategy - February 2018 - 34
Feed Strategy - February 2018 - 35
Feed Strategy - February 2018 - Feed formulation software enhances effi ciency, profi ts
Feed Strategy - February 2018 - 37
Feed Strategy - February 2018 - 38
Feed Strategy - February 2018 - 39
Feed Strategy - February 2018 - VICTAM Asia to showcase latest in feed, food industries
Feed Strategy - February 2018 - 41
Feed Strategy - February 2018 - Products
Feed Strategy - February 2018 - 43
Feed Strategy - February 2018 - Advertisers’ Index
Feed Strategy - February 2018 - Cover3
Feed Strategy - February 2018 - Cover4
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