The ability of faecal nitrogen to predict digestibility for goats and sheep fed with tropical herbage
The ability of faecal nitrogen to predict digestibility for goats and sheep fed with tropical herbage
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DOI：
10.1017/s0021859603003265
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发表时间：
2003-05
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影响因子：
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通讯作者：
M. Boval;H. Archimède;J. Fleury;A. Xandé
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文献类型：
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作者：
M. Boval;H. Archimède;J. Fleury;A. Xandé
通过评估粪便指数来评估饲喂马唐的小型反刍动物的有机物消化率 (OMD)。对五只克里奥尔雄鹿和五只黑腹公羊进行了连续消化率试验，在再生期 15 至 70 天期间饲喂新鲜切割的马唐果。在 55 天内，每天对每只动物提供的牧草量、拒绝的牧草量和粪便进行称重。保留草本植物和粪便样本，测定干物质和有机物质（DM 和 OM）、粗蛋白（CP）、中性和酸性洗涤纤维（NDF 和 ADF）以及木质素含量（ADL）。 OMD 是按每周和每只动物计算的。使用线性或曲线模型，根据测量的所有粪便成分（CPf、NDFf、ADFf 和 ADLf）计算每个物种的 OMD 预测回归。与其他粪便成分的回归相比，针对每个物种计算时，CPf 的回归具有最低的残余标准误差 (<0·028)。在 CPf 的回归中，每个物种的预测参数的最低标准误差是通过 a-b/CPf 形式的模型获得的。后者可以预测牧场的 OMD，与放牧马唐草场的山羊和母羊的理论能量需求一致。
Faecal indices were evaluated to assess organic matter digestibility (OMD) for small ruminants fed with Digitaria decumbens. A continuous digestibility trial was conducted with five Creole bucks and five Black-belly rams, fed with fresh cut Digitaria decumbens from 15 to 70 days of re-growth. The amount of herbage offered, the refusals and the faeces were weighed daily for each animal during 55 days. Herbage and faeces samples were kept to determine dry and organic matter (DM and OM), crude protein (CP), neutral and acid detergent fibre (NDF and ADF) and lignin contents (ADL). OMD was calculated per week and per animal. Predictive regressions of OMD were calculated for each species, from all the faecal components measured (CPf, NDFf, ADFf and ADLf), using linear or curvilinear models. Regressions from CPf had the lowest residual standard error (<0·028) when calculated for each species, compared with regressions from the other faecal components. Among the regressions from CPf, the lowest standard error of the predictive parameters was obtained with a model in the form of a-b/CPf, for each species. The latter allows prediction of OMD at pasture, consistent with theoretical energy requirement for both goats and ewes grazing a Digitaria decumbens based sward.