Using Performance Data to
pick the best sheep
-GROWTH
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Pick the ram most likely to
improve weaning weight in your flock if you were given
performance data presented in the following three ways.
The following are Examples Only
A. Where only weaning weights of the rams are known.
|
Ram |
120/02 |
143/02 |
| Weaning Weight | 35.0 kg | 38.5 kg |
B. Where weaning weights and dates of birth are known.
|
Ram |
120/02 |
143/02 |
| Weaning Weight | 35.0kg | 38.5kg |
| Date of Birth | 10-Sep | 30-Aug |
| Growth to Weaning | 270g/day | 273g/day |
| Adjusted weaning weight (Adjusted to birth date of 1-Sep) |
37.4 kg | 37.5 kg |
C. Where weaning weights, dates of birth, and the performance of other
progeny born to the sire and dam are known.
|
Ram |
120/02 |
143/02 |
| Weaning Weight | 35.0kg | 38.5kg |
| Date of Birth | 10-Sep | 30-Aug |
| Growth to Weaning | 270g/day | 273g/day |
| Adjusted weaning weight (Adjusted to birth date of 1-Sep) |
37.4 kg | 37.5 kg |
| Family average growth rate | 320g/day | 260g/day |
| Weaning weight BV | +1.9 kg | +0.21 kg |
Questions
- What use is raw data?
- Does an animal's own performance reflect genetic merit?
Conclusions
- S.I.L corrects for known, non-genetic effects (e.g. age, birth rank) and uses information from ALL relatives to derive a BV.
- More information = more accurate selection
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This info has been provided by S.I.L - Examples for breeders to use - 3rd April 2003
Created by ZWeb
© "Val d'Or Suffolks" 2013. All rights reserved
Last revised: September 20, 2013
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