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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.

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Presentation on theme: "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."— Presentation transcript:

1 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 b Animal Breeding and Genomics Centre, Wageningen UR c VION Food Group, The Netherlands

2 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

3 Boar taint Consumers recognise boar taint by SMELL When pork is heated

4 So do the slaughter plants.. Schnippe, Schweinzuch und Schweinemast, SUS, 4:2011

5 We did so in the lab 21,972 samples Strong boar taint Boar taint Weak boar taint Deviant but not boar taint Normal pork odour Human Nose Scores (HNS) Source: Mathur et al. (2011) submitted to Meat Science journal

6 Androstenone (pheromone)Androstenone (pheromone) Produced in testesProduced in testes Related urine odourRelated urine odour Androstenone (pheromone)Androstenone (pheromone) Produced in testesProduced in testes Related urine odourRelated urine odour But the science believes in boar taint compounds Skatole (3-methyle-indole)Skatole (3-methyle-indole) Produced in hind gutProduced in hind gut Related Fecal odourRelated Fecal odour Skatole (3-methyle-indole)Skatole (3-methyle-indole) Produced in hind gutProduced in hind gut Related Fecal odourRelated Fecal odour Accumulated in fat

7 Genetic parameters Trait And (ln) Ska (ln) P (high Ska) HNS Androstenone (ln) Skatole (ln) P (High Skatole) Human Nose Score (HNS) 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 More than 7,000 boars

8 Production traits And (ln) Ska (ln) P (high Ska) HNS Daily Gain Fat depth Loin depth Genetic correlations Source: Windig et al. (2011) submitted to Journal of Animal Science N= 7,336 : Androstenone and Skatole N= 20,130 : Human Nose Scores

9 Reproduction traits And (ln) Ska (ln) P (high Ska) HNS Age at first insem. (d) Gestation length (d) Weaning to inse. Int. (d) Total number born (N) Still born ln(N+1) Mortality (%) Genetic correlations Significant estimates in bold

10 Genomic information Reduction in boar taint due to a single SNP with large effect Source: Duijvesteijn et al. BMC Genetics (2010)

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

12 Genomic selection Genomic Breeding Values (GBVs) Genomic Breeding Values (GBVs) Phenotypic data HNS, And, Ska Genotypes based on selected SNP panel

13 Breeding goal Reduce True Boar taint Assumed to follow normal distribution Values on underlying scale based on area under the curve

14 Sorting of LBT boars TOPIGS LBT-boar a) b) c) Genomics Human nose scores ASI compounds (carcass and biopsy) LBT = Low Boar Taint

15 Effect of genetic selection Strong boar taint Boar taint Weak boar taint Deviant but not boar taint Normal pork odour Human Nose Scores - 41% - 40% - 19% - 8% + 5% Effect of LBT boars (%)

16 Conclusion Boar taint can be reduced through genetics through a combination of: A) Boar taint compounds (And, Ska) B) Human nose scores C) Genomic information

17 Thanks !


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