Digesta flow studies in sheep fed two mature annual legumes [Trifolium subterraneum; Trifolium resupinatum]
1994
Li, X. | Kellaway, R.C. (Sydney Univ., Camden (Australia). Dept. of Animal Science) | Ison, R.L. (Sydney Univ. (Australia). Dept. of Crop Science) | Annison, G. (Commonwealth Scientific and Industrial Research Organisation, O'Halloran Hill (Australia). Div. of Human Nutrition)
Mature subterranean clover (Trifolium subterraneum cv. Junee) and Persian clover (Trifolium resupinatum cv. Kyambro) were fed to cannulated sheep. Contents of hemicullulosic polysaccharides (xylose and mannose monomers) were higher in Kyambro than in Junee. Although Junee contained higher levels of total N and amino acids, the relative concentrations of cystine and methionine were markedly higher in Kyambro. Dry matter intakes and flow rates in the abomasum, ileum and faeces were similar on Kyambro and Junee. Dietary N intake was lower and endogenous re-cycled N higher on Kyambro than on Junee. Ileal flow of N was similar to N intake on Kyambro. Apparent N digestibility was lower in the whole tract and higher in the intestines on Kyambro. The higher apparent digestibility of N in the intestines of sheep eating Kyambro was associated with a greater proportion of N leaving the stomach coming from endogenous sources. The lower nitrogen digestibility of Kyambro in the whole tract indicated lower digestibility of dietary N, which was associated with higher contents of xylose and mannose.
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