摘要
The objectives of the trial were to compare the effects of supplementing rare earth elements (REE) lanthanum (La), cerium (Ce) and praseodymium (Pr) on rumen fermentation, nutrient digestion, methane (CH4) production, nitrogen (N) balance and plasma biochemical parameters in beef cattle. Four Simmental male cattle, aged 12 months, with initial average liveweight of 333 ± 9 kg and fitted with rumen cannulas, were fed with a basal ration composed of concentrate mixture and maize silage. Animals received a basal ration without adding REE (Control) or three treatments, i.e. supplementing LaCl3, CeCl3 or PrCl3 at 204 mg/kg DM to the basal ration, respectively, which were allocated in a 4 × 4 Latin square design. Each experimental period lasted 15 d, consisting of 12 d for pre-treatment and three subsequent days for sampling. Results showed that all tested levels of REE tended to increase neutral detergent fibre digestibility (p = 0.064) and tended to decrease rumen CH4 production (p = 0.056). Supplementing LaCl3 and CeCl3 decreased total N excretion and urinary N excretion, increased N retention (p < 0.05), tended to increase total urinary purine derivatives (PD) (p = 0.053) and microbial N flow (p = 0.095), whereas supplementing PrCl3 did not affect N retention, urinary PD and microbial N flow. No differences were found in the effects of nutrient digestibility, CH4 production and plasma biochemical parameters among LaCl3, CeCl3 and PrCl3. Further trials using graded levels of LaCl3, CeCl3 and PrCl3 in a wide range are needed to obtain more pronounced results for comparing effects of La, Ce and Pr on rumen fermentation and nutrient digestion in beef cattle.
摘要译文
该试验的目的是比较补充稀土元素（REE）镧对瘤胃发酵，营养物质的消化效果（La），铈（CE）和镨（Pr），甲烷（CH 4）的生产，氮（N）的平衡和血浆在肉牛生化参数。四西门塔尔牛男，年龄12个月用333±9公斤初始平均活重，并配备了瘤胃插管，分别饲喂基础日粮混合精矿和玉米青贮组成。动物接受一个基础日粮不添加稀土元素（对照）或三种处理，即补充LACL 3，CeCl 3或PRCL 3在204毫克/公斤的DM的基础日粮，分别这被分配在一个4×4拉丁方设计。每个实验期间持续了15天，包括12天进行预处理和采样三个后续天。结果表明，稀土元素所有测试水平趋于增加中性洗涤纤维的消化率（P \x3d 0.064），并呈下降趋势瘤胃CH 4的生产（P \x3d 0.056）。氮沉积补充LACL 3和CeCl 3降低总氮排泄，尿氮的排泄，增加（p053）和微生物N流量（P \x3d 0.095），而补充PRCL 3并没有影响氮沉积，尿液PD和微生物N流量。没有差异，在营养物质消化率的影响，CH 4生产中LACL 3，CeCl 3和PRCL 3血浆生化指标。使用LACL 3的分级水平进一步的试验，CeCl 3和PRCL 3在大范围需要向用于比较的La，Ce和Pr中的瘤胃发酵和营养物质的消化在肉牛效果得到更显着的效果。
Shixin Lin[a]; Chen Wei[a]; Guangyong Zhao[a][*]; Tingting Zhang[a] ; Kai Yang[a]. Comparison of the effects of lanthanum, cerium and praseodymium on rumen fermentation, nutrient digestion and plasma biochemical parameters in beef cattle[J]. Archives of Animal Nutrition, 2015,69(1): 46-56