Sheep Genetics (SG) is the largest and most comprehensive across flock sheep genetic benchmark in the world.
Lambplan provides data services for the prime lamb breeds & Merinoselect serves the wool and sheepmeat industry based on the merino.

There is significant overlap in carcase & disease traits which are common to both, still, caution is needed when comparing different breeds of sheep.

Australian Sheep Breeding Values (ASBV’s) are the common genetic language used.

ASBV’s are provided in the Petali White Suffolk catalogue for these important traits:


WWT – Weaning WEIGHT (kg)

WWT estimates the genetic difference in body weight at weaning or 100 days of age.

PWWT – Post Weaning WEIGHT (kg) or EARLY GROWTH

PWWT estimates the genetic difference in body weight at 225 days of age.

PFAT – Post Weaning FAT(mm)

PFAT estimates the genetic difference in fat depth at 45kg live weight.

PEMD – Post Weaning Eye MUSCLE Depth (mm)

PEMD estimates the genetic difference in eye muscle depth at 45kg live weight.


BWT – Birth Weight (kg)

BWT estimates the genetic difference between animals in live weight at birth.

PWEC – Post Weaning WORM EGG COUNT (%)

PWEC estimates the genetic difference in worm burden at 225 days of age, expressed as a % relative to a count of 500 epg.

WEC ASBV describes the value of an animal’s genes for carrying worm burdens – a combination of being genetically less likely to pick up worms (resistant) and being able to cope immunologically with worm burdens (resilient).

L2020 – Lamb 2020 Index

The Lamb 2020 index has been developed to suit terminal sire breeders with clients targeting a 22 kg lamb carcass, from either a Merino or first-cross ewe base where worms may be a significant challenge to lamb production.



10 year change

BWT 8% .10kg
WWT 24% 2.7kg
PWT 25% 3.5kg
PFAT 9% 0.2mm
PEMD 22% 1.3mm
PWEC 12% -30%


More information can be found on the Lambplan website

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