The Data Explained
The Suffolk indexes are expressed in a £ sign of which 50% should be handed down to any progeny. Individual indesies are given in positive weight factors that favour superior gigot and muscularity, although a penalty for low fat EBV’S is applied to avoid rams with progeny being to difficult to finish.
They are scored on a terminal sire index which has been designed to increase the weight of lean tissue weight in the carcase. The measured traints incorporating, scan weight, muscle depth, fat depth, fat weight and lean weight of carcase where CT scanning is used.
The recording system plays a large part in the selection of replacements in our flock and selection of the rams and semen used each year, we ultrasonically scan the lambs in June and then their birth, 8wk weight and scan weight muscle depth and fat depth are used to formulate an index.
The rams are ultrasonically scanned at 20 wks old, however, the top 10 or 12 rams are forwarded to be CT scanned which increased the accuracy to 99% from 75%.
Performance Data Graphs, Genetic Trends
If you want a Top genetic purchase Ortum Rams are in the top 5% of the breed, selected on their carcase and ease of management.
50% of this value as £ should be passed onto its prodegy so each lamb should on average gain you above £2.25 each through superior carcase and speed to desirable carcase weight. The earlier being the higher price in the market place, ultimately increasing the return of the sheep enterprise.
J79 Scan, showing the cross section disections of the CT scan, from which indexes are calculated.