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Genetic solution to the problem of boar taint for production of entire males

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Genetic solution to the problem of boar taint for production of entire males P.K. Mathur a ,*, H.A. Mulder b , J. Ten Napel b , J. J. Windig b , R.E. Crump b , B. van der Fels b , L. Heres c , S. Bloemhof a , M. S. Lopes a , E. F. Knol a a IPG, Institute for Pig Genetics B.V., The Netherlands

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Genetic solution to the problem of boar taint for production of entire males

P.K. Mathura,*, H.A. Mulderb , J. Ten Napelb, J. J. Windigb, R.E. Crumpb, B. van der Felsb , L. Heresc, S. Bloemhofa,M. S. Lopesa, E. F. Knola

a IPG, Institute for Pig Genetics B.V., The Netherlands

b Animal Breeding and Genomics Centre, Wageningen UR

c VION Food Group, The Netherlands

genetic solution to the problem of boar taint
Detection methods

Human Nose Scores (HNS)

Androstenone and skatole

Genetic parameters

Production

Reproduction

Genomic analysis

Breeding strategy

Genetic solution to the problem of boar taint
boar taint
Boar taint

Consumers recognise boar taint by SMELL

When pork is heated

so do the slaughter plants
So do the slaughter plants ..

Schnippe, Schweinzuch und Schweinemast, SUS, 4:2011

we did so in the lab
We did so in the “lab”

Human Nose Scores (HNS)

4

3

2

1

0

21,972 samples

Source: Mathur et al. (2011) submitted to Meat Science journal

slide6

But the science believes in boar taint compounds

Accumulatedin fat

  • Skatole (3-methyle-indole)
  • Produced in hind gut
  • Related “Fecal” odour
  • Androstenone (pheromone)
  • Produced in testes
  • Related “urine” odour
genetic parameters
Genetic parameters

More than 7,000 boars

Heritabilities (diagonal), Genetic correlation (below diagonal), Phenotypic correlations (above diagonal). Significant estimates in bold

Source: Windig et al. (2011) submitted to Journal of Animal Science

production traits
Production traits

Genetic correlations

N= 7,336 : Androstenone and Skatole N= 20,130 : Human Nose Scores

Source: Windig et al. (2011) submitted to Journal of Animal Science

reproduction traits
Reproduction traits

Genetic correlations

Significant estimates in bold

genomic information
Genomic information

Reduction in boar taint due to a single SNP with large effect

Source: Duijvesteijn et al. BMC Genetics (2010)

we used a panel of snps
We used a panel of SNPs

Each AI boar genotyped with a panel of boar taint related SNPs selected out of 60K SNPs

genomic selection
Genomic selection

Phenotypic data

HNS,

And, Ska

Genotypes based on selected SNP panel

Genomic Breeding Values

(GBVs)

breeding goal
Breeding goal

Reduce “True” Boar taint

  • Assumed to follow normal distribution
  • Values on underlying scale based on area under the curve
sorting of lbt boars
Sorting of LBT boars

a)

ASI compounds (carcass and biopsy)

b)

TOPIGS

LBT-boar

Human nose scores

c)

LBT = Low Boar Taint

Genomics

effect of genetic selection
Effect of genetic selection

Human Nose Scores

Effect of LBT boars (%)

4

3

2

1

0

conclusion
Conclusion

through a combination of:

A) Boar taint compounds (And, Ska)

B) Human nose scores

C) Genomic information

Boar taint can be reduced through genetics

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