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首页> 外文期刊>Archivos Latinoamericanos de Produccion Animal >Indigestible internal markers for estimating the digestibility of feedlot beef cattle diets
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Indigestible internal markers for estimating the digestibility of feedlot beef cattle diets

机译：难以消化的内部标记物，用于估算肉牛场日粮的消化率

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The aim of the present work was to evaluate the adequacy of indigestible neutral detergent fiber (NDFi) and indigestible acid detergent fiber (ADFi) as internal markers to estimate the digestibilities of three feedlot beef cattle diets containing 60% corn silage and 40% concentrates, including sunflower meal and urea plus either 25% ground corn grain (GCG); 8.2% GCG, and 19.3% soybean hulls; or 8.5% GCG and 20% corn germ meal. Twenty-seven Nellore steers in confinement were distributed among the three treatments. The NDFi and ADFi percentages were quantified after 144h of in vitro incubation of ingredients, orts and faecal samples. The mean digestibilities of dry matter (59.9 vs 59.8%), crude protein (54.4 vs 54.3%), NDF (52.2 vs 51.8%) and ADF (40.4 vs 40.9%) estimated by NDFi and ADFi, respectively, were similar with no effect of ingredients used. It was concluded that the NDFi (18.9%) and ADFi (11.8%) concentrations of the 25% GCG diet were adequate to estimate the digestibility coefficients in diets with 40% of concentrate, independent of the inclusion of fiber-rich ingredients in partial substitution of ground corn.
机译：当前工作的目的是评估不易消化的中性洗涤剂纤维（NDFi）和不易消化的酸性洗涤剂纤维（ADFi）作为内部标志物的适用性，以评估三种饲喂60％玉米青贮和40％浓缩饲料的肥育肉牛的消化率，包括向日葵粉和尿素，再加上25％的玉米粉（GCG）; GCG 8.2％，大豆皮19.3％;或8.5％的GCG和20％的玉米胚芽粉。在三个处理中分配了二十七​​个Nellore围产的坐月子。在成分，肠胃和粪便样本进行体外培养144小时后，对NDFi和ADFi百分比进行定量。 NDFi和ADFi分别估计干物质的平均消化率（59.9比59.8％），粗蛋白（54.4比54.3％），NDF（52.2比51.8％）和ADF（40.4比40.9％）相似，没有影响。使用的成分。结论是：25％GCG日粮中NDFi（18.9％）和ADFi（11.8％）的浓度足以估算40％浓缩饲料日粮中的消化系数，而与部分替代品中富含纤维成分无关玉米粉。

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