Table 4 Total cost of automatic feeder at different feed pellets sizes, air flow rate and rotational speeds of screw.
From: Evaluation of fish feeder manufactured from local raw materials
Feed pellets size, mm | Flow rate, m3 min−1 | Rotational speed of screw, rpm | Mean | ||||
|---|---|---|---|---|---|---|---|
180 | 360 | 540 | 720 | 900 | |||
Total cost of automatic feeder, EGP kg−1 | |||||||
1 | 10 | 0.24 | 0.21 | 0.18 | 0.15 | 0.14 | 0.18 |
15 | 0.17 | 0.17 | 0.16 | 0.15 | 0.14 | 0.16 | |
20 | 0.12 | 0.11 | 0.11 | 0.10 | 0.07 | 0.10 | |
Mean | 0.18 | 0.16 | 0.15 | 0.13 | 0.12 | ||
2 | 10 | 0.23 | 0.18 | 0.16 | 0.13 | 0.12 | 0.16 |
15 | 0.17 | 0.15 | 0.14 | 0.13 | 0.12 | 0.14 | |
20 | 0.12 | 0.11 | 0.10 | 0.09 | 0.07 | 0.10 | |
Mean | 0.17 | 0.15 | 0.13 | 0.12 | 0.10 | ||
3 | 10 | 0.18 | 0.15 | 0.13 | 0.10 | 0.09 | 0.13 |
15 | 0.14 | 0.12 | 0.11 | 0.10 | 0.08 | 0.11 | |
20 | 0.1 | 0.09 | 0.09 | 0.08 | 0.06 | 0.08 | |
Mean | 0.14 | 0.12 | 0.11 | 0.09 | 0.08 | ||
Mean of size (A) | 0.15ab | 0.13a | 0.11a | ||||
Mean of time (B) | 0.16b | 0.14b | 0.09a | ||||
Mean of speed (C) | 0.16bc | 0.14b | 0.13ab | 0.11a | 0.10a | ||
LSD at 0.05 | A | B | C | AB | AC | BC | ABC |
0.03 | 0.03 | 0.02 | N.S. | N.S. | N.S | N.S. | |