Table 3.
Comparison of measured traits among different RFI levels
| Items | Low RFI(n = 33) | Middle RFI(n = 33) | High RFI(n = 33) | ||||
|---|---|---|---|---|---|---|---|
| Mean | S.D. | Mean | S.D. | Mean | S.D. | ||
| General Traits | BW 19, kg | 1.1 | 0.1 | 1.1 | 0.1 | 1.2 | 0.1 |
| BW 42, kg | 3.9 | 0.3 | 3.8 | 0.2 | 3.9 | 0.2 | |
| Feed intake, kg | 6.5c | 0.7 | 7.2b | 0.4 | 8.4a | 1.1 | |
| RFI | −0.9c | 0.59 | −0.024b | 0.027 | 0.9a | 1.1 | |
| FCR | 2.3b | 0.2 | 2.7a | 0.1 | 2.7a | 0.19 | |
| Feeding behavior traits | Total feed time, min | 297.8B | 65.1 | 321.1AB | 61.0 | 346.1A | 98.5 |
| Daily feed intake, kg/d | 0.297C | 0.024 | 0.324B | 0.025 | 0.372A | 0.061 | |
| Visit feed intake, g | 23 | 5 | 23 | 5 | 25 | 5 | |
| Meal feed intake, g | 33b | 7 | 37b | 6 | 40a | 8 | |
| Visit duration, s | 76.1 | 20.7 | 75.4 | 21.3 | 77.5 | 22.3 | |
| Meal duration, s | 147.5c | 38.8 | 171.8a | 40.4 | 170.1a | 41.7 | |
| Daily interval between meals, min | 165 | 26 | 167 | 23 | 161 | 28 | |
| Daily feeding rate, g/min | 19.6 | 3.0 | 20.3 | 4.3 | 21.7 | 4.0 | |
| Number of meals per day | 8.5 | 3.3 | 8.4 | 3 | 8.7 | 3.2 | |
| Number of visits per day | 12.9 | 5.9 | 13.8 | 5.8 | 14.5 | 6.6 | |
BW 19: average body eight at d 19; BW 42: average body eight at d 42; RFI, residual feed intake; FCR, feed conversion ratio. S.D., standard deviation. Different letters in the same row means significant differences between different groups. Capital: P < 0.01; Lowercase: P < 0.05