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Pedigree and performance data is analysed to calculate how much of each animal’s performance is due to its breeding merit and how much is due to the environment in which it has been raised. This assessment of breeding potential is expressed as Estimated Breeding Values or EBVs.
The following EBVs are produced for Signet clients:
|Litter Size||Prolificacy||This trait is defined as the total number of lambs born alive and dead when pregnancy reaches full term.|
|Maternal Ability (kg)||Maternal ability of ewe, relates to milk production||The component of a lamb’s growth to eight weeks of age that is influenced by the ewes breeding potential for milk production|
|Eight Week Weight (kg)||Growth rate to eight weeks of age
Maternal ability of ewe Weight at eight weeks of age.
|To achieve an adjusted eight 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 Signet-approved technician. Ultrasound measurements at the third lumbar vertebra|
|Fat Depth (mm)||Leanness||Measured at 21 weeks of age by a Signet-approved technician. Three ultrasound measurements taken at the third lumbar vertebra|
|Mature Size (kg)||Ewe efficiency||Ewe liveweight at first mating(kg)|
|EBVs only produced for flocks involved in CT scanning|
|Carcase Lean Weight (kg)||Muscle yield||Quantity of muscle tissue in the carcase assessed using Computed Tomography (CT) image analysis of breeding stock at 21 weeks of age.|
|Carcase Fat Weight (kg)||Leanness||Quantity of fat in the carcase assessed using Computed Tomography (CT) image analysis of breeding stock at 21 weeks of age.|
|Gigot Muscularity (mm)||Carcase shape||Thickness of the muscle tissue in the gigot assessed using Computed Tomography (CT) standardised to a fixed femur length.|
|EBV only produced for flocks involved in FEC sampling|
|Faecal Egg Count (FEC)||Worm resistance||Faecal samples are taken from lambs at 21 weeks of age and submitted for laboratory analysis to measure the worm egg count in the sample.|
In this section
- Technical Information
- Why is Genetic Improvement Important?
- Selecting the Right Ram
- Estimated Breeding Values
- Interpreting Estimated Breeding Values
- Breeding Indexes
- Accuracy Values
- Ultrasound Scanning
- Computed Tomography (CT) Scanning
- Ram Buying Tips
- Performance Recording your Pedigree flock
- Electronic Data Transfer
- Downloading EBV's from the Internet
- Inbreeding - How to Manage it
- Inbreeding - Publications and Resources
- Recessive Inherited Diseases
- On-line Training Package
- Filling in your Ram Sale Cards
- Marketing Breeding Sheep for Better Returns
- Breeding Fit for Purpose Rams - a Blueprint for Breeders
- Print EBV Sale Charts Online
- Recording Lambing Ease and Birth Weight