Recording Your Sheep - Table 1 

Standard Performance Traits

Raw DataTrait 
Litter Size Born Prolificacy This trait is defined as the total number of lambs born alive and dead when pregnancy reaches full term. Ewes that are barren or abort are considered to have a litter size of 0.
Litter Size Reared Prolificacy

Maternal ability of ewe
If lambs are weighed at 8 weeks of age or at scanning they are deemed to have been successfully reared and the ewe’s performance record will be credited accordingly.
Eight Week Weight (kg) Growth rate to 8 weeks of age

Maternal ability of ewe
Weight at 8 weeks of age. To achieve an adjusted 8-week weight lambs must be weighed between 42 and 84 days of age.
Scan Weight (kg) Growth rate to 21 weeks of age Weight at scanning time, when lambs are 21 weeks of age.
Muscle Depth (mm) Carcase muscling Measured at 21 weeks of age by a technician. One ultrasound measurement taken across the third lumbar vertebra.
Fat Depth (mm) Leanness Measured at 21 weeks of age by a technician. Three ultrasound measurements taken across the third lumbar vertebra.
Mature size (kg) Ewe efficiency Ewe liveweight at first mating.

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