Table 4.
Effect of marker, protein source and basal diets on the apparent ileal digestibility (AID, %) of nitrogen, organic matter and dry matter of the experimental diets1.
| Item | Chromic oxide |
Acid-insoluble ash |
SED2 | SED3 | Significance4 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wheat | Cottonseed meal |
Soybean meal |
Wheat | Cottonseed meal |
Soybean meal |
||||||||
| Simple | Wheat | Simple | Wheat | Simple | Wheat | Simple | Wheat | ||||||
| Nitrogen | 69.3 | 60.7 | 67.4 | 78.4 | 74.1 | 73.7 | 66.5 | 76.7 | 80.5 | 77.9 | 1.27 | 1.12 | D (0.037); Prot. (<0.001); M (<0.001) |
| Dry matter | 62.5 | 72.9 | 54.3 | 76.8 | 61.4 | 72.2 | 77.8 | 67.4 | 79.1 | 67.7 | 1.37 | 1.21 | D (0.034); Prot. (<0.001); BD (<0.001); M (<0.001); B × M (0.007); Prot. × M (0.004) |
| Organic matter | 58.4 | 76.8 | 56.8 | 80.1 | 65.1 | 74.1 | 81.3 | 70.6 | 82.7 | 72.5 | 1.39 | 1.24 | Prot. (<0.001); BD (<0.001); M (<0.001); BD × M (<0.001) |
SED = standard error of difference.
1
The basal diet was either a 1:1 sugar and starch mix (simple) or pure wheat (wheat); protein sources were either 400 g/kg cottonseed meal or soybean meal mixed with the basal diet or diet containing 926 g/kg wheat. n = 5 for each diet.
2
When comparing different basal diet means.
3
When comparing the same basal diet means.
4
Significance of effects of pure wheat (926 g/kg) vs. other diets (D), protein source (Prot.), basal diet (BD) or indigestible marker (M) and interactions have been included in parentheses.