NZ Understanding SNP based Poll Tests

Understanding SNP based Poll Tests.

As you will be aware, NZHA moved to SNP based DNA testing in December 2017. The move to SNP based testing means that we now have a far more accurate test for Poll genes in Hereford Cattle.

Previously used Beef CRC based Poll tests would return a result and an accuracy (e.g. Homozygous Polled 98%).

With SNP based Poll testing, the Poll gene can now be identified with a lot more accuracy and a description of the poll allele found is included as a subscript.

When reporting Poll test results from a SNP based test, the results will be reported as seen below:

SNP Test Result

Beef CRC Test Result

Detail

Pc Pc

PP

Homozygous Polled – A ‘True

Polled’ animal and will only produce Polled (or

Scurred) calves, they will not produce Horned calves.

Pc Pf

Pf Pf

PcH

PH

Heterozygous Polled – Animal is Polled or Scurred and carries a Polled and Horned gene and can produce

Polled, Horned (or Scurred) calves.

PfH

HH

HH

Homozygous Horned – The animal is horned and can produce Horned, Polled (or Scurred) calves.

Please note that the SNP based test is used when requesting a stand-alone Poll test and an ‘add-on’ to a GGP genotype.

Potential mating outcomes:

Mating a Homozygous Polled animal with a Homozygous Polled animal (PP x PP)

 

P

P

 

 

P

PP

PP

 

  • 100% Homozygous Polled (PP) calves

P

PP

PP

 

 

 

Mating a Homozygous Polled animal with a Heterozygous Polled animal (PP x PH)

 

P

H

 

 

P

PP

PH

 

  • 50% Homozygous Polled (PP) calves

P

PP

PH

 

  • 50% Heterozygous Polled (PH) calves

 

Mating a Homozygous Polled animal with a Homozygous Horned animal (PP x HH)

 

H

H

 

 

P

PH

PH

 

  • 100% Heterozygous Polled (PH) calves

P

PH

PH

 

 

 

Mating a Heterozygous Polled animal with a Heterozygous Polled animal (PH x PH)

 

P

H

 

  • 25% Homozygous Polled (PP) calves

P

PP

PH

 

  • 50% Heterozygous Polled (PH) calves

H

PH

HH

 

  • 25% Homozygous Horned (HH) calves

 

Mating a Heterozygous Polled animal with a Homozygous Horned animal (PH x HH)

 

H

H

 

 

P

PH

PH

 

  • 50% Heterozygous Polled (PH) calves

H

HH

HH

 

  • 50% Homozygous Horned (HH) calves

 

Mating a Homozygous Horned animal with a Homozygous Horned animal (HH x HH)

 

H

H

 

 

H

HH

HH

 

  • 100% Homozygous Horned (HH) calves

H

HH

HH

 

 

 

 

 

 

NZHA

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Feilding 4740, New Zealand.
P. +64 6 323 4484
F. +64 6 323 3878
E. office@herefords.co.nz

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