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

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 of entire males

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 of entire males

Consumers recognise boar taint by SMELL

When pork is heated


So do the slaughter plants
So do the slaughter plants .. of entire males

Schnippe, Schweinzuch und Schweinemast, SUS, 4:2011


We did so in the lab
We did so in the of entire males“lab”

Human Nose Scores (HNS)

4

3

2

1

0

21,972 samples

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


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

But the science believes of entire malesin 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 of entire males

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 of entire males

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 of entire males

Genetic correlations

Significant estimates in bold


Genomic information
Genomic information of entire males

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 of entire males

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


Genomic selection
Genomic selection of entire males

Phenotypic data

HNS,

And, Ska

Genotypes based on selected SNP panel

Genomic Breeding Values

(GBVs)


Breeding goal
Breeding goal of entire males

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 of entire males

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 of entire males

Human Nose Scores

Effect of LBT boars (%)

4

3

2

1

0


Conclusion
Conclusion of entire males

through a combination of:

A) Boar taint compounds (And, Ska)

B) Human nose scores

C) Genomic information

Boar taint can be reduced through genetics


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

Thanks ! of entire males