Recording Your Sheep - Table 1

Standard Performance Traits

Raw Data	Trait
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.

---