Table 3.
Effects of forage type and guanidine acetic acid (GAA) addition on growth performance of feedlotting lambs at different feeding stages (stage 1, 1–62 day; stage 2, 63–120 day).
| Items | Forage | GAA addition | S.E.M | P -value | ||||
|---|---|---|---|---|---|---|---|---|
| Control | UGAA | CGAA | Forage | GAA | Interaction | |||
| Feeding stage 1 | ||||||||
| DMI (g/day) | OH | 915b | 1051a | 1036a | 23.5 | 0.003 | 0.004 | 0.019 |
| OHWS | 933 | 968 | 918 | |||||
| ADG (g/day) | OH | 275 | 287 | 307 | 9.6 | 0.043 | 0.217 | 0.233 |
| OHWS | 269 | 279 | 270 | |||||
| F: G | OH | 3.36 | 3.65 | 3.41 | 0.115 | 0.923 | 0.293 | 0.546 |
| OHWS | 3.50 | 3.53 | 3.41 | |||||
| Feeding stage 2 | ||||||||
| DMI (g/day) | OH | 1,430 | 1,436 | 1,462 | 27.3 | 0.099 | 0.414 | 0.949 |
| OHWS | 1,382 | 1,406 | 1,424 | |||||
| ADG (g/day) | OH | 300 | 317 | 330 | 13.3 | 0.206 | 0.077 | 0.717 |
| OHWS | 276 | 316 | 308 | |||||
| F: G | OH | 4.87 | 4.66 | 4.53 | 0.228 | 0.612 | 0.195 | 0.702 |
| OHWS | 5.10 | 4.52 | 4.74 | |||||
| Whole experiment period | ||||||||
| DMI (g/day) | OH | 1,164b | 1,237ab | 1,241a | 22.2 | 0.010 | 0.058 | 0.358 |
| OHWS | 1,150b | 1,180a | 1,163b | |||||
| ADG (g/day) | OH | 287b | 302ab | 318a | 8.0 | 0.022 | 0.014 | 0.358 |
| OHWS | 273b | 297a | 289ab | |||||
| F: G | OH | 4.08 | 4.10 | 3.93 | 0.119 | 0.500 | 0.359 | 0.537 |
| OHWS | 4.26 | 4.00 | 4.05 | |||||
OH, the rations with the forage type of oaten hay; OHWS, the rations with the forage type of oaten hay plus wheat silage; UGAA, the rations added with 1 g/kg of uncoated GAA product; the rations added with 1 g/kg of coated GAA product.
ADG, average daily gain; DMI, dry matter intake; F: G, feed conversion efficiency expressed as the ratio of feed intake to live weight gain; S.E.M, standard error of least square means.
a, b
In the same row with different superscript letters indicates the significantly different values of P < 0.05.