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Jeisane fiona mpp final

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Jeisane fiona mpp final Jeisane fiona mpp final Presentation Transcript

  • Maternal Productivity Project (Southern Aust) Jeisane Accioly, Fiona Jones and Michael Laurence (on behalf of a large team)
  • WA Maternal Productivity Team Brad Seib John Milligan Tex Hann Nola Mercer Ryan Drage Brian McIntyre Peter Jelinek Leonarda Paszkudzka-Baizert Greg Sawyer
  • Collaborators
  • Other Researchers
    • Western Australia
    • Jane Speijers
    • 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
  • Industry Push
  • Low Efficiency High Efficiency
    • 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 issues
    • 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 issues
  • Key issue in South
    • Maternal efficiency:
    • Cow feed (75%)
      • Maintenance
      • Energy storage & retrieval
    • Reproductive performance
    • Calving ease
    • Calf value
    • Longevity
    • Cow salvage value
    • 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 aims
  • 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
    • Two approaches:
    • Correlations between traits across large range of production systems (Industry herds)
    • Differences between divergent single-trait lines in formal design (Research herds)
    Project approach
  • 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
  • Vasse (WA) Struan (SA)
  • Intensive measurements and estimation of food intake Research herds 3 calving seasons 4 Lines High Fat Low Fat High NFI Low NFI 2 Nutrition High Low 2 Sites Vasse, WA Struan, SA x x
  • EBV differences between the lines 0.48 0.42 2.10 2.40 EMA 0.3 -1.2 -1.8 -3.3 DTC 58.6 42.0 81.3 67.7 MCWT 60.6 47.6 83.8 75.9 Wt600 9.0 7.8 10.6 10.8 Milk 25.9 18.9 36.3 31.3 Wt200 4.6 2.9 4.9 3.8 BWt -0.87 0.77 NFI F -0.47 0.65 NFI P -0.6 3.0 -1.5 1.4 Rump P8 -0.4 3.2 -1.4 1.2 Rib fat Low NFI (n=81) High NFI (n=81) Low Fat (n=170) High Fat (n=170) EBV
  • Heifer management Nutritional treat’s applied 9 week joining Calving 9 week joining Nutritional treat’s applied Calving Weaning Weaning Vasse Struan 9 week joining 9 week joining Sep Oct Nov Dec Jan Feb Mar Apr May June July Aug Sep Oct Nov Dec Jan Feb June July Aug Sep Oct Nov Dec Jan Feb Mar Apr May June July Aug Sep Oct Nov
  • Energy Supply & Demand: Early Calvers & Late Calvers
  • Rainfall (mm) 2006: 577 mm 2007: 810 mm 2008: 671 mm 2009: 679 mm 2010: 464.1mm
  • Nutritional control
    • Fat lines
  • Weight of Fat cows
  • P8 Fat
  • 1 st calvers pre-mating and pregnancy test 86.8 85.1 4.9 367 465 Low Fat 93.4 93.5 6.5 370 473 High Fat Adjusted conception rate* Conception rate* P8 fat (mm)*** Weight (kg) Age (days)* Line
  • Pre-mating and pregnancy test 2 nd calving Line Nutrition Weight (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
  • Days to calving for heifers *
  • Days to Calving 2 nd calvers
  • Messages
    • 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??
  • Birth weight
  • Calf weaning weight from 1 st calvers
  • Messages (calves)
    • No effect of fat genotype on birth or weaning weight
    • Nutrition effect on weaning weight
    • Net Feed Intake lines
  • Weight of NFI cows
  • P8 Fat – NFI cows
  • 1 st calvers pre-mating and pregnancy test Line Age (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
  • Pre-mating and pregnancy test 2 nd calving Line Nutrition Weight (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
  • Days to calving for heifers
  • Days to Calving 2 nd calvers
  • Birth weight
  • Calf weaning weight from 1 st calvers
  • Messages
    • 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
  • Main 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
  • To be continued …