genetic connectedness: it is all about forming strong ......it’s all about forming relationships...
TRANSCRIPT
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Genetic connectedness: it is all about forming strong relationships
Ron LewisAnimal Science Department
NSIP Regional Meeting10th Annual Center of the Nation NSIP Sale
Clay County Fairgrounds, Spencer, IAJuly 22, 2016
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Today’s talk
Connectedness What is it? Why does it matter? How much is needed?
In practice The data Their summary Their implications
Summing up
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+ E
What is connectedness?
Genetic evaluation is about parsing
P = G
It’s all about forming
relationships
Genotype (EBV)● WWT: 4.32 kg● PWWT: 8.66 kg● PFAT: -2.76 mm● PEMD: 2.00 mm
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Genetic relationship
Sire 1 Sire 2Environment
Flock 1
Flock 2
Connected
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Genetic relationship
Sire 1 Sire 2 Sire 3 Sire 4Environment
Flock 1
Flock 2
Flock 3
Flock 4
Disconnected
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Why does it matter?
Seedstock flocks sizes generally small Few animals to choose among within flock,
which slows genetic progress May wish to step outside one’s own flock to
source new genetics
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Why does it matter?
Seedstock flocks sizes generally small Seek fair comparisons of genetic merit of
animals across flocks But flocks spread over a wide geographical
region … and husbandry differences among flocks
can mask genetic differences
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Why does it matter?
Connectedness describes risk when comparing EBV of animals in different flocks Degree of risk depends on how well flocks are
genetically related Since such risk is bounded, aim is for
sufficient connectedness
Connectedness is different from accuracy
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0.00 0.05 0.10 0.15
Ris
kine
ss (M
SE
)
Connectedness
How much is needed?
Risk Strong(reduce risk
by 90%)
Moderate(reduce risk
by 80%)
(Lewis et al, 1999, 2005; Kuehn et al., 2008, 2009)
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In practice
Connectedness evaluations in NSIP Dorset Hampshire Suffolk
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The data
Pedigree Dorset
Since 1978
Hampshire Since 1972
Suffolk Since 1972
Weaning weight Dorset
Since 1986
Hampshire Since 2002
Suffolk Since 1983
“Active” flocks: weights recorded in 2014, 2015 and/or 2016
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PedigreeVariable Dorset Hampshire SuffolkNo. animals 18,179 6,463 55,599No. sires 717 302 2,989No. dams 4,173 1,472 13,534No. flocks 33 15 105Sire family size
Median 5 6 5Average 22.6 19.7 16.8Largest 246 218 355
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Weaning weight†
Variable Dorset Hampshire SuffolkNo. lambs 11,610 4,423 36,409No. flocks
Total 31 14 101Active‡ 11 11 18
AverageAge (day) 65.3 65.7 63.0
† Heritability of 0.15‡ Weights recorded in 2014, 2015 and/or 2016
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Dorset connectedness
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Dorset connectedness
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Dorset connectedness
Implications:• One main cluster of 6 flocks• More reliable comparison of EBV could
be achieved by greater exchange of rams with flocks in this cluster
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Hampshire connectedness
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Hampshire connectedness
Implications:• One main cluster of 6 flocks• More reliable comparison of EBV could
be achieved by greater exchange of rams with flocks in this cluster
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Suffolk connectedness
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Suffolk connectedness
Implications:• Two main separate clusters, perhaps
reflecting different biological types• If comparisons between clusters & with
other flocks deemed a priority, greater exchange of rams would reduce risks
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Summing up
Connectedness matters in across-flock genetic evaluations Flocks often differ genetically and
environmentally (e.g., husbandry) If connectedness among flocks is insufficient,
comparisons of EBV across flocks become risky
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Summing up
Connectedness can be used to define the dynamics of a breeding program Delineate differences among breeding
objectives May be useful for identifying flocks and
individuals useful for strategic genotyping
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Summing up
Connectedness is determined for an individual trait Often a weight trait (e.g., weaning; post-
weaning) If recording norms for alternative traits
differ, connectedness levels may also differ e.g., time required for expression
of litter size
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Summing up
Increasing connectedness in its own right is not a goal If sufficient, producers have flexibility to focus
on other priorities in their breeding programs However, if connectedness is tenuous, it is
worth implementing strategies to improve genetic relationships Source rams from well-connected flocks with a
long history in NSIP
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Thanks for listening
I appreciate the support from ASI and the Let’s Grow committee, and from NSIP
Questions?