There is no publicly available official Oba Marshall breeder weight chart that should be treated as a guaranteed farm target. The table below is a Nigerian research observation. Use it as context, then judge your flock against its chick source, feed, sex, health, climate and management.
| Age | Observed average weight |
|---|---|
| Week 3 | 0.51 kg |
| Week 4 | 0.74 kg |
| Week 5 | 0.95 kg |
| Week 6 | 1.10 kg |
| Week 7 | 1.27 kg |
| Week 8 | 1.56 kg |
| Week 9 | 1.76 kg |
| Week 10 | 1.96 kg |
How to weigh the flock
- Weigh on the same day and near the same time each week.
- Sample birds from different parts of the pen, not only the easiest birds to catch.
- Record the number weighed, total weight, average, lightest and heaviest birds.
- Use the same reliable scale and zero it before weighing.
- Track mortality and removals beside the weight record.
Do not rely on the average alone
A flock can achieve an acceptable average while many birds remain too small. Count how many sampled birds fall within 10% of the sample average and watch whether uniformity improves or worsens.
If growth is behind
Confirm chick age and scale accuracy. Then check water flow, feeder access, feed phase and physical quality, heat stress, ventilation, litter, disease signs and mortality. Calculate feed consumed and FCR before blaming genetics. Use the FCR Calculator and follow the complete management guide.
Research caution
Different Nigerian studies report different Marshall outcomes. One ten-week comparison recorded 2.326 kg for Marshall under its stated conditions, while the series above came from a different Nigerian observation. That difference is exactly why research values must not be advertised as universal breeder targets.
