applying feed intake monitoring systems into producer testing programs dr. daryl r. strohbehn...
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![Page 1: Applying feed intake monitoring systems into producer testing programs Dr. Daryl R. Strohbehn Extension Beef Specialist Iowa Beef Center @ ISU](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2d5503460f94a03d9e/html5/thumbnails/1.jpg)
Applying feed intake monitoring Applying feed intake monitoring systems into producer testing systems into producer testing programsprograms
Dr. Daryl R. Strohbehn
Extension Beef Specialist
Iowa Beef Center @ ISU
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Why Feed Efficiency?Why Feed Efficiency?
With everything else equal or even less wouldn’t you rather have a more feed efficient sire?
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Why Feed Efficiency?Why Feed Efficiency? Feed cost represents 60% of
the total cost in finishing cattle. (Fox @ 2002 BIF)
Feed cost represents 63% of total financial cost to run a beef cow. (Strohbehn, IA SPA results 2000-04)
A 10% improvement in feed efficiency can improve feedlot profits 43%. (Fox, et.al. 2001)
65-75% of total dietary energy cost in breeding cows is required for maintenance. (Ferrell & Jenkins 1985; NRC 1996)
A 5% improvement in feed efficiency has an economic impact 4 times greater than a 5% improvement in ADG. (Gibb & McAllister 1999)
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Why Feed Efficiency?Why Feed Efficiency?
Environmental friendly cattle
Selection for improved feed efficiency will:– Lower methane
emissions by 9 to 12% (Okine, et.al. 2001)
– Reduce manure N, P and K production by 15-17% (Arthur, et.al. 2002)
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Why Feed Efficiency?Why Feed Efficiency?
It’s a heritable trait.
TraitHeritability
Feed conversion (f/g) .36
Feed efficiency (g/f) .42
Feed intake .41
Koots, et.al. 1994
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Feed Conversion = Feed Intake / Animal Gain
Example - 4:1 or 8:1 (lbs of dry matter / lb gain)
Feed Efficiency = Animal Gain / Feed Intake
Examples: .25 lbs gained / lb feed or .125 lbs gain / lb feed
Efficiency Traits – Let’s get our definitions straight
(usually expressed in units of 100% dry matter)
Later on I will talk about RFI, NFI and NFE.
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I remember when….1960-70’sI remember when….1960-70’s
Individual fed bulls in separate pens– Example: Wye Plantation in Queenstown,
Maryland Daily hand kept written records Very, very high labor No animal peck order, thus no impact
from competition
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<-PinPointer 4000 system
Technology Advancements
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Calan Electronic Feed Gates
- Each animal has its own space and daily written records
Technology Advancements
System at Circle A Angus, MO
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GrowSafe GrowSafe System, CanadaSystem, Canada
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Feed Conversion testing with Feed Conversion testing with on the farm/ranch systemson the farm/ranch systems Don’t take this job lightly
– It’s like milking dairy cows, methodical daily duties.
Requires attention to feed and management details, regardless of intake monitoring system utilized.
Requires meticulous record keeping, both with feed intake and weight gains.
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Record analysis assistance Record analysis assistance may be needed.may be needed.
Feed conversion is just not feed intake divided by gain.
Most tests are equal time on feed, thus bull weights while on test vary a great deal.
BIF method: account for differences in average bull weights during test.
Range in off test weight: 974 - 1541
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BIF MethodologyBIF Methodology
Adjusted Feed Conversion uses metabolic weights.– ( W.75 / Wi
.75 ) x ( Feed / Gain )
– W is the mid test weight; the average of the initial weight and final weight.
– This method adjusts feed/gain of heavier than average bulls downward and lighter than average bulls upward.
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Question ???Question ??? Two bulls have the same Feed Conversion and 3.5 lb ADGs on
120 day test.– 6.5 lbs feed to 1.0 lb gain– Bull A and B have off test weights of 1300 and 1200, respectively.– Are they the same for Feed Conversion?
NO !– After adjusting for differences in body weight– Bull A’s average test weight was 1090 lbs, Bull B’s average test weight
was 990 lbs» Bull A Adjusted FC=6.27
» Bull B Adjusted FC=6.74
Beef Improvement Federation Guidelines
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Duane Warden
Warden’s Ironwood Angus
Council Bluffs, IA
24 years of feed efficiency testing using
PinPointer system
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Warden’s Adjusted Feed Conversion 1995-2004
y = -0.2021x + 7.6846
R2 = 0.3845
4
4.5
5
5.5
6
6.5
7
7.5
8
1995 1997 1999 2000 2001 2002 2003 2004
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Warden’s Adjusted Feed Conversion 1995-2004
y = -0.2021x + 7.6846
R2 = 0.3845
4
4.5
5
5.5
6
6.5
7
7.5
8
1995 1997 1999 2000 2001 2002 2003 2004
701bull
New Levelbull
0350bull
4 Point 8bull
3303bull
4333bull
Influence sires – Past and Present
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Warden’s Adjusted Feed Conversion 1995-2004
y = -0.2021x + 7.6846
R2 = 0.3845
4
4.5
5
5.5
6
6.5
7
7.5
8
1995 1997 1999 2000 2001 2002 2003 2004
701bull
New Levelbull
0350bull
4 Point 8bull
Warden Smarts
Sire Adj Feed Conversion
701 5.84
New Level 5.02
0350 5.18
4 Point 8 4.82
3303 5.21
4333 5.18
3303bull
4333bull
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Warden’s Adjusted Feed Conversion 1995-2004
y = -0.2021x + 7.6846
R2 = 0.3845
4
4.5
5
5.5
6
6.5
7
7.5
8
1995 1997 1999 2000 2001 2002 2003 2004
701bull
New Levelbull
0350bull
4 Point 8bull
Warden Smarts
Sire RFI
701 -.70
New Level -2.20
0350 -1.33
4 Point 8 -2.61
3303 -1.06
4333 -2.50
3303bull
4333bull
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Over 40 Years AgoOver 40 Years Ago
Dr. Robert Koch, U of Nebraska research and reported on a new system that adjusted feed intakes for body weight and growth.
Splits feed intake into two portions– 1. feed intake for a given level
of growth & size– 2. a residual portion
Data from:
-Lincoln, NE
-Fort Robinson, NE
-Fort Reno, OK
Breeds:
Angus
Hereford
Shorthorn
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Thus was born RFIThus was born RFI(Residual Feed Intake)(Residual Feed Intake)
RFI is also known as:– NFI: Net Feed Intake– NFE: Net Feed Efficiency
RFI is the difference between a bull’s actual feed intake and its expected feed intake based on its size and growth.
RFI = actual DMI – expected DMI Heritability estimates 29% to 46%
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RFIRFI(Residual Feed Intake)(Residual Feed Intake)
Used to identify animals that are either + or – from their expected ME intake.
-NFE = high efficiency +NFE = low efficiency
ADG
Wt.
Individual Bull
Expected DMI
Individual bull DMI
-NFE
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Studies indicate RFI is an Studies indicate RFI is an independent traitindependent trait
Warden data no correlation between Off Test Weight and RFI
Relationship between RFI and Off Test WeightWarden Data: 1987-2005 (n=316 hd.)
-6.00
-4.00
-2.00
0.00
2.00
4.00
6.00
900 1100 1300 1500
Off Test Weight
RFI
r = -.02
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Studies indicate RFI is an Studies indicate RFI is an independent traitindependent trait
Warden data no correlation between ADG and RFI.
Relationship between RFI and ADG Warden Data: 1987-2005 (n=316 hd.)
2.50
3.00
3.50
4.00
4.50
5.00
5.50
-6.00 -4.00 -2.00 0.00 2.00 4.00 6.00
RFI
ADG
r = -.01
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Studies indicate RFI is an independent trait, Studies indicate RFI is an independent trait, but related to Adjusted Feed Conversionbut related to Adjusted Feed Conversion
Warden data .46 correlation between Adjusted Feed Conversion and RFI
Relationship between RFI and Adjusted Feed Conversion
4
5
6
7
8
9
10
-5.00 -3.00 -1.00 1.00 3.00 5.00
NFI
AFE
r = .46
RFI
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Studies indicate RFI is an independent Studies indicate RFI is an independent trait, but related to Dry Matter Intaketrait, but related to Dry Matter Intake
Warden data .55 correlation between Dry Matter Intake and RFI.
Relationship between RFI and Dry Matter Intake
18.00
20.00
22.00
24.00
26.00
28.00
30.00
32.00
34.00
-5.00 -3.00 -1.00 1.00 3.00 5.00
RFI
DMI
r = .55
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Other relationships were Other relationships were evaluated….evaluated….
A significant correlation between RFI and ultrasound fat cover existed (.17)– Means fatter bulls were less
efficient No significant relationships
existed between RFI and other performance parameters.– EPDs (BW, WW, YW, Milk)
and ultrasound REA
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Dilemma with calculating RFIDilemma with calculating RFI Requires doing a regression
analysis of the data to develop an equation called Expected Dry Matter Intake.
Expected Dry Matter Intake is then used against Actual Dry Matter Intake to develop the RFI.
Not many producers have the expertise and knowledge of statistics to do this exercise.
Going to require serious expertise involvement either from Extension Service or Breed Association.
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Warden-Beedle information gathering system using off the shelf electronic components.
Joint project with the Iowa Beef Center, Miraco, ID-ology, and Rice Lake Scales
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Our Future…..Let’s Hope.
A view from Australia on the possibilities
Angus NFI Percentile