World Grain - February 2013 - 84

RICE QUARTERLY

Factors affecting

rice milling quality
A

ny factor that causes a reduction in the strength of rice
kernels, and the resultant ability of kernels to withstand
the forces imparted during hulling and milling, will impact milling yield.
These factors include those incurred during production,
such as fungal diseases and insects, and high nighttime air
temperatures during kernel filling. Additionally, the moisture content (MC) at which rice is harvested can have a dramatic impact on milling yield, with head rice yield (HRY)
reductions occurring by harvesting at greater MCs (reductions due to increasing numbers of immature kernels) or
lesser MCs (reductions due to moisture adsorption fissuring)
than optimal.
RICE MILLING
Once harvested and dried, “processing” of rough rice into
milled rice consists of several operations.
After cleaning to remove foreign material, rough rice is
hulled to produce brown rice. The hull represents approximately 20% of the mass of a rough rice kernel. Brown rice is
usually milled immediately after hulling, removing the bran
layers and germ by frictional and/or abrasive action. The bran
represents approximately 10% of the original rough rice mass.
The remaining milled or “white” rice comprises head rice,
defined as those kernels retaining three-fourths or more of its
original length and broken kernels (brokens). The milled rice
yield (MRY) represents the mass of milled rice expressed as
a percentage of the original dried rough rice mass. Typical
MRYs range from 68% to 72%. Upon removal of brokens,
only head rice remains. The mass of head rice, expressed as
a percentage of the original rough rice mass, is defined as the
head rice yield (HRY). Head rice yields can vary from 0 (all
kernels are broken) to a theoretical maximum of approximate84

by Terry J. Siebenmorgen

Environmental temperature and
harvest moisture content can have
dramatic impact on quality
ly 70% (no kernels are broken). Milling quality is often expressed as a ratio of the HRY to the MRY (e.g., a 58/70 value
would indicate an HRY of 58%, MRY of 70% and brokens
yield of 12%, the difference between the two values).
Broken kernels reduce milling yield. Brokens produced
during milling are generally the result of immature, chalky,
or fissured kernels, all of which are weak and typically break
during milling. Since brokens are only worth approximately
60% of the value of head rice, HRY directly determines the
economic value of a rice lot, e.g., if the value of head rice
is $0.20/lb and brokens $0.13/lb, the discount for HRY reduction would be $0.07 for every percentage point change in
HRY for each 100 lbs of rough rice. Thus, if HRY decreases
by 10 percentage points (e.g., from 60% to 50%), the price
decrease would be $0.70 for every 100 lbs of rough rice, or
$0.32 per bushel.
The degree to which rice is milled, or the degree of milling, is
determined by the amount of bran/oil remaining on milled kernels. Whiteness, as often measured with a color meter, is sometimes used to indicate degree of milling. However, a more common method of quantifying degree of milling is measuring the
amount of lipids, or oil, on the surface of milled kernels. Since
bran is approximately 20% lipids, the surface lipid content of
milled rice is directly related to the amount of bran remaining on
February 2013 / World Grain / www.World-Grain.com


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World Grain - February 2013

Table of Contents for the Digital Edition of World Grain - February 2013

World Grain - February 2013
Table of Contents
From the editor-in-chief - In pursuit of accurate data on food loss
Calendar of Events/IDMA 2013
News Review - Grain helps Cargill quadruple second-quarter earnings
Brazil’s grain harvest up 8.6%
NAMA receives final methyl bromide exemption
NAMA announces new chairman
Mary Waters resigns as NAMA president
FAO says Food Price Index down 7% from 2011
Former GEAPS president, Melvin Mai, dies
Drought impact on food prices to strengthen in 2013
DDGS classified as non-hazardous cargo
IPPE attracts 25,000 attendees, 1,189 exhibitors
Deyu forms grain storage, procurement subsidiary
New leadership for Bunge in Canada
CHS earnings down 17% in first quarter
CHS acquires Kentucky river terminal
Syrian agricultural production suffering due to conflict
Cargill, Arasco plan joint venture in Saudi Arabia
Cargill completes purchase agreement for Pennfield Corp.
Last day for open outcry trading at KCBT is July 28
Grain Market Review - Rice
Country Focus - Focus on Kazakhstan
Feature - Rolling with the changes
Paterson's Roots in Canadian History
Feature - Growing at a rapid pace
Feature - Stepping stone
Feature - A conversation with Greg Schlafer
Feature - Fortification study
Feature - Drought threatens the Mississippi
Feature - Stock market review
Bloomberg World Food Price Index closes up 11.3% from 2011
Feature - Promising forecast for E.U. agriculture
Feature - E.U. feed production stable
Rice Quarterly - Factors affecting rice milling quality
Rice News Roundup - FAO: Rice production outpacing consumption
Iran to import 170,000 tonnes of rice from India
South Korea removes U.S. rice import, sales suspension
USA Rice, Mexican millers discuss increasing rice use
U.S. moves closer to rice market access in China
Feature - Future of fuels for U.S. freight transport
Feature - New Year's resolution
Supplier News
Product Showcase
World Grain Archive
Ad Index/Reader Information Form International Faxback Program
World Grain - February 2013 - World Grain - February 2013
World Grain - February 2013 - 2
World Grain - February 2013 - 3
World Grain - February 2013 - 4
World Grain - February 2013 - Table of Contents
World Grain - February 2013 - From the editor-in-chief - In pursuit of accurate data on food loss
World Grain - February 2013 - 7
World Grain - February 2013 - Calendar of Events/IDMA 2013
World Grain - February 2013 - 9
World Grain - February 2013 - NAMA receives final methyl bromide exemption
World Grain - February 2013 - 11
World Grain - February 2013 - Mary Waters resigns as NAMA president
World Grain - February 2013 - Former GEAPS president, Melvin Mai, dies
World Grain - February 2013 - Drought impact on food prices to strengthen in 2013
World Grain - February 2013 - IPPE attracts 25,000 attendees, 1,189 exhibitors
World Grain - February 2013 - New leadership for Bunge in Canada
World Grain - February 2013 - CHS acquires Kentucky river terminal
World Grain - February 2013 - Syrian agricultural production suffering due to conflict
World Grain - February 2013 - 19
World Grain - February 2013 - Last day for open outcry trading at KCBT is July 28
World Grain - February 2013 - 21
World Grain - February 2013 - Grain Market Review - Rice
World Grain - February 2013 - 23
World Grain - February 2013 - 24
World Grain - February 2013 - 25
World Grain - February 2013 - Country Focus - Focus on Kazakhstan
World Grain - February 2013 - 27
World Grain - February 2013 - 28
World Grain - February 2013 - 29
World Grain - February 2013 - Feature - Rolling with the changes
World Grain - February 2013 - 31
World Grain - February 2013 - Paterson's Roots in Canadian History
World Grain - February 2013 - 33
World Grain - February 2013 - 34
World Grain - February 2013 - 35
World Grain - February 2013 - Feature - Growing at a rapid pace
World Grain - February 2013 - 37
World Grain - February 2013 - 38
World Grain - February 2013 - 39
World Grain - February 2013 - Feature - Stepping stone
World Grain - February 2013 - 41
World Grain - February 2013 - 42
World Grain - February 2013 - 43
World Grain - February 2013 - Feature - A conversation with Greg Schlafer
World Grain - February 2013 - 45
World Grain - February 2013 - 46
World Grain - February 2013 - 47
World Grain - February 2013 - 48
World Grain - February 2013 - 49
World Grain - February 2013 - Feature - Fortification study
World Grain - February 2013 - 51
World Grain - February 2013 - 52
World Grain - February 2013 - 53
World Grain - February 2013 - Feature - Drought threatens the Mississippi
World Grain - February 2013 - 55
World Grain - February 2013 - 56
World Grain - February 2013 - 57
World Grain - February 2013 - 58
World Grain - February 2013 - 59
World Grain - February 2013 - 60
World Grain - February 2013 - 61
World Grain - February 2013 - 62
World Grain - February 2013 - 63
World Grain - February 2013 - 64
World Grain - February 2013 - 65
World Grain - February 2013 - Feature - Stock market review
World Grain - February 2013 - 67
World Grain - February 2013 - 68
World Grain - February 2013 - 69
World Grain - February 2013 - 70
World Grain - February 2013 - 71
World Grain - February 2013 - Bloomberg World Food Price Index closes up 11.3% from 2011
World Grain - February 2013 - 73
World Grain - February 2013 - 74
World Grain - February 2013 - 75
World Grain - February 2013 - Feature - Promising forecast for E.U. agriculture
World Grain - February 2013 - 77
World Grain - February 2013 - 78
World Grain - February 2013 - 79
World Grain - February 2013 - 80
World Grain - February 2013 - 81
World Grain - February 2013 - Feature - E.U. feed production stable
World Grain - February 2013 - 83
World Grain - February 2013 - Rice Quarterly - Factors affecting rice milling quality
World Grain - February 2013 - 85
World Grain - February 2013 - 86
World Grain - February 2013 - 87
World Grain - February 2013 - 88
World Grain - February 2013 - 89
World Grain - February 2013 - 90
World Grain - February 2013 - 91
World Grain - February 2013 - Iran to import 170,000 tonnes of rice from India
World Grain - February 2013 - 93
World Grain - February 2013 - 94
World Grain - February 2013 - U.S. moves closer to rice market access in China
World Grain - February 2013 - Feature - Future of fuels for U.S. freight transport
World Grain - February 2013 - 97
World Grain - February 2013 - 98
World Grain - February 2013 - 99
World Grain - February 2013 - 100
World Grain - February 2013 - 101
World Grain - February 2013 - 102
World Grain - February 2013 - 103
World Grain - February 2013 - 104
World Grain - February 2013 - 105
World Grain - February 2013 - 106
World Grain - February 2013 - 107
World Grain - February 2013 - 108
World Grain - February 2013 - 109
World Grain - February 2013 - Feature - New Year's resolution
World Grain - February 2013 - 111
World Grain - February 2013 - 112
World Grain - February 2013 - 113
World Grain - February 2013 - Supplier News
World Grain - February 2013 - 115
World Grain - February 2013 - 116
World Grain - February 2013 - 117
World Grain - February 2013 - 118
World Grain - February 2013 - 119
World Grain - February 2013 - 120
World Grain - February 2013 - 121
World Grain - February 2013 - Product Showcase
World Grain - February 2013 - 123
World Grain - February 2013 - 124
World Grain - February 2013 - World Grain Archive
World Grain - February 2013 - Ad Index/Reader Information Form International Faxback Program
World Grain - February 2013 - 127
World Grain - February 2013 - 128
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http://digital.world-grain.com/sosland/wg/2006_12_01
http://digital.world-grain.com/sosland/wg/2006_11_01
http://digital.world-grain.com/sosland/wg/2006_10_01
http://digital.world-grain.com/sosland/wg/2006_09_01
http://digital.world-grain.com/sosland/wg/2006_08_01
http://digital.world-grain.com/sosland/wg/2006_07_01
http://digital.world-grain.com/sosland/wg/2006_06_01
http://digital.world-grain.com/sosland/wg/2006_05_01
http://digital.world-grain.com/sosland/wg/2006_04_01
http://digital.world-grain.com/sosland/wg/2006_03_01
http://digital.world-grain.com/sosland/wg/2006_02_01
http://digital.world-grain.com/sosland/wg/2006_01_01
http://digital.world-grain.com/sosland/wg/2005_12_01
http://digital.world-grain.com/sosland/wg/2005_11_01
http://digital.world-grain.com/sosland/wg/2005_10_01
http://digital.world-grain.com/sosland/wg/2005_09_01
http://digital.world-grain.com/sosland/wg/2005_08_01
http://digital.world-grain.com/sosland/wg/2005_07_01
http://digital.world-grain.com/sosland/wg/2005_06_01
http://digital.world-grain.com/sosland/wg/2005_05_01
http://digital.world-grain.com/sosland/wg/2005_04_01
http://digital.world-grain.com/sosland/wg/2005_03_01
http://digital.world-grain.com/sosland/wg/2005_02_01
http://digital.world-grain.com/sosland/wg/2005_01_01
http://digital.world-grain.com/sosland/wg/2004_12_01
http://digital.world-grain.com/sosland/wg/2004_11_01
http://digital.world-grain.com/sosland/wg/2004_10_02
http://digital.world-grain.com/sosland/wg/2004_10_02
http://digital.world-grain.com/sosland/wg/2004_10_01
http://digital.world-grain.com/sosland/wg/2004_09_01
http://digital.world-grain.com/sosland/wg/2004_08_01
https://www.nxtbookmedia.com