vasse fd sep10
DESCRIPTION
Jeisane's presentation Vasse Field Day 15 Sep 2010TRANSCRIPT
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Maternal Productivity
Project
(southern Aust)
Jeisane Accioly, Fiona Jones and
Michael Laurence(on behalf of a large team)
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WA Maternal Productivity WA Maternal Productivity TeamTeam
Brad Seib
John Milligan
Tex Hann
NolaMercer
Ryan Drage
Brian McIntyre Peter Jelinek LeonardaPaszkudzka-Baizert
Greg Sawyer
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CollaboratorsCollaborators
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Western Australia
• Jane Speijers
Other Researchers
South Australia
• Wayne Pitchford
• Katrina Copping
• Mick Deland
• Nick Edwards
• Ian Carmichael
• Michelle Hebart
• Stephen Lee
New South Wales
• Kath Donehue
•Robert Herd
• Peter Parnell
Victoria
• John
Graham
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Industry Push
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Low Efficiency High Efficiency
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1. Adoption of selection
strategies influencing
body composition (e.g.
RBY and NFI) constrained
by industry concerns
about impact on breeding
herd efficiency, especially
in variable nutritional
environments
Key industry issuesKey industry issues
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2. The seedstock industry
lacks suitable selection
criteria for effective
improvement of
breeding herd efficiency
(kg cow and calf per MJ
energy consumed by
cow & calf)
Key industry issuesKey industry issues
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Key issue in SouthKey issue in South
Maternal efficiency:
Cow feed (75%)
• Maintenance
• Energy storage & retrieval
Reproductive performance
Calving ease
Calf value
Longevity
Cow salvage value
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Improve breeding herd efficiency in temperate Australia
Impact of selection for body composition on herd efficiency,
especially under variable nutrition
Efficient use of available feed resources & body reserves to
produce progeny
Full multi-trait index with measure of maternal efficiency &
optimally weighted composition traits for variable environments
Project aimsProject aims
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Key research question …
Does selection for improved NFI or RBY% influence breeding herd efficiency* ?
Hypothesis: Selection for reduced NFI and reduced carcass fatness increase
breeding herd efficiency in good, but not in poor
nutritional environments
* Kg of cow and calf liveweight / MJ energy
consumed by the breeding herd
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Two approaches:
1. Correlations between traits across large range of production
systems (Industry herds)
2. Differences between divergent single-trait lines in formal
design (Research herds)
Project approachProject approach
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Animal Selection• 154 “fat line” yearling heifers arrived Jan-Feb 07
sourced from industry seedstock herds in Vic & SA
(‘B’ heifers).
• 62 NFI heifers arrived Jan-Feb 08 Sourced from Trangie NFI Selection Herd, NSW.
• 95 “fat line” yearling heifers arrived Feb-Mar 08 sourced from industry seedstock herds in Vic & SA (‘C’ heifers).
Maternal efficiency herds
Angus
Hereford
Research herds
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Vasse (WA)
Struan (SA)
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4 LinesHigh FatLow FatLow FatHigh NFILow NFI
2 NutritionHighLow
2 SitesVasse, WAStruan, SA
x x
Intensive measurements and estimation of food intake
Research herdsResearch herds
3 calving seasons
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EBV differences EBV differences between the linesbetween the lines
EBVHigh Fat (n=170)
Low Fat (n=170)
High NFI (n=81)
Low NFI (n=81)
Rib fat 1.2 -1.4 3.2 -0.4
Rump P8 1.4 -1.5 3.0 -0.6
NFIP 0.65 -0.47
NFIF 0.77 -0.87
BWt 3.8 4.9 2.9 4.6
Wt200 31.3 36.3 18.9 25.9
Milk 10.8 10.6 7.8 9.0
Wt600 75.9 83.8 47.6 60.6
MCWT 67.7 81.3 42.0 58.6
DTC -3.3 -1.8 -1.2 0.3
EMA 2.40 2.10 0.42 0.48
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Heifer managementHeifer management
Nutritional treat’s applied
9 week joining
Calving
SepSep
OctOct
NovNov
Dec Dec
JanJan
FebFeb
MarMar
AprApr
MayMay
JuneJune
JulyJuly
AugAug
SepSep
OctOct
NovNov
Dec Dec
JanJan
FebFeb
JuneJune
JulyJuly
AugAug
Sep Sep
OctOct
NovNov
Dec Dec
JanJan
FebFeb
MarMar
AprApr
MayMay
JuneJune
JulyJuly
AugAug
SepSep
OctOct
NovNov
9 week joining
Nutritional treat’s applied
Calving
Weaning Weaning
VasseVasse StruanStruan
9 week joining9 week joining
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0
100
200
300
400
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Pas
ture
En
erg
y S
up
ply
(M
J/h
a/d
ay)
0.0
100.0
200.0
300.0
400.0
Cat
tle
En
erg
y D
eman
d
(MJ/
hea
d/d
ay)
Energy Supply & Demand: Early Calvers & Late CalversEnergy Supply & Demand: Early Calvers & Late Calvers
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Rainfall (mm)
2006: 577 mm 2007: 810 mm 2008: 671 mm 2009: 679 mm2010: 464.1mm
0
50
100
150
200
250
300
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2006 20072008 20092010
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Nutritional controlNutritional control
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Fat lines
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Weight of Fat cowsWeight of Fat cows
0
100
200
300
400
500
600
700
PM1 W0 PM 2 W1
Co
w W
eig
ht
(kg
)
High Fat Low Fat High Fat High Nut Low Fat High Nut High Fat Low Nut Low Fat Low Nut
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P8 FatP8 Fat
0
2
4
6
8
10
12
PM1 W0 PM 2 W1
Co
w p
8 F
at (
mm
)
High Fat Low Fat High NFI High Nut Low NFI High Nut High NFI Low Nut Low NFI Low Nut
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11stst calvers pre-mating calvers pre-mating and pregnancy testand pregnancy test
LineAge
(days)*Weight
(kg)P8 fat
(mm)***Conception
rate*
Adjusted conception
rate*
High Fat 473 370 6.5 93.5 93.4
Low Fat 465 367 4.9 85.1 86.8
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Pre-mating and pregnancy Pre-mating and pregnancy test 2test 2ndnd calving calving
Line NutritionWeight (kg)***
P8 fat (mm)**
Conception rate
High Fat High 531 8.3 94.9
High Fat Low 488 5.4 88.4
Low Fat High 575 7.6 93.5
Low Fat Low 491 4.2 85.7
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Days to calving for Days to calving for heifersheifers
260
270
280
290
300
310
320
330
High Nutrition Low Nutrition
Day
s To
Cal
ving
(day
s)
High Fat Low Fat
*
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Days to Calving 2Days to Calving 2ndnd calvers calvers
295
297
299
301
303
305
307
309
311
313 High Fat - High Nut" High Fat - Low Nut
Low Fat- High Nut Low Fat - Low Nut
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MessagesMessages
• Low fat cows were bigger / heavier (ave. 50kg)
• Low fat cows were leaner (>3mm)
• Fat difference was consistent across seasons
• Low fat cows seem to have poorer reproduction??
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Birth weightBirth weight
0
5
10
15
20
25
30
35
40
1st calf 2nd calf
Bir
th W
eig
ht
(kg
)
High Fat High Nut Low Fat High Nut High Fat Low Nut Low Fat Low Nut
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Calf weaning weight Calf weaning weight from 1from 1stst calvers calvers
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Messages (calves)Messages (calves)
• No effect of fat genotype on birth or weaning weight
• Nutrition effect on weaning weight
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Net Feed
Intake lines
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Weight of NFI cowsWeight of NFI cows
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P8 Fat – NFI cowsP8 Fat – NFI cows
0
2
4
6
8
10
12
14
16
PM1 W0 PM 2 W1
Co
w p
8 (m
m)
High NFI Low NFI High NFI High Nut Low NFI High Nut High NFI Low Nut Low NFI Low Nut
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11stst calvers pre-mating calvers pre-mating and pregnancy testand pregnancy test
LineAge
(days)Weight
(kg)P8 fat
(mm)***Conception
rate
Adjusted conception
rate
High NFI 493 306 10.4 91.9 91.8
Low NFI 492 315 8.2 91.6 91.6
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Pre-mating and pregnancy Pre-mating and pregnancy test 2test 2ndnd calving calving
Line NutritionWeight
(kg)P8 fat
(mm)***Conception
rate
High NFI High 478 11.9 95.1
High NFI Low 441 8.7 96.1
Low NFI High 488 8.8 87.4
Low NFI Low 438 6.1 88.7
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Days to calving for Days to calving for heifersheifers
260
270
280
290
300
310
320
330
High Nutrition Low Nutrition
Day
s To
Cal
ving
(day
s)
High NFI Low NFI
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Days to Calving 2Days to Calving 2ndnd calvers calvers
310
312
314
316
318
320
322
324
326
High NFI High Nut High NFI Low Nut Low NFI High Nut Low NFI Low Nut
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Birth weightBirth weight
0
5
10
15
20
25
30
35
40
1st calf 2nd calf
Bir
th W
eig
ht
(kg
)
High NFI High Nut Low NFI High Nut High NFI Low Nut Low NFI Low Nut
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Calf weaning weight Calf weaning weight from 1from 1stst calvers calvers
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MessagesMessages
• No difference in weight of cows
• Trend for Low NFI cows to be leaner
• No effect of NFI in reproduction
• No effect of NFI in birth or weaning weight
• Effect of nutrition on
weaning weight
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Main messagesMain messages
• Genetically fatter cows seem to be more fertile, especially under low nutrition
• Selection for body composition holds across seasons and nutrition treatments
• No effect of cow fatness or NFI EBV on weaning weight of her calf
• Selection for NFI is associated with changes in fatness
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To be continued …