Salami Saheed A, Moran Colm A, Warren Helen E, Taylor-Pickard Jules
Solutions Deployment Team, Alltech (UK) Ltd., Stamford PE9 1TZ, UK.
Regulatory Affairs Department, Alltech SARL, Rue Charles Amand, 14500 Vire, France.
Animals (Basel). 2020 Apr 10;10(4):657. doi: 10.3390/ani10040657.
Slow-release urea (SRU) is a coated non-protein nitrogen (NPN) source for ruminant nutrition. This study applied a meta-analytic technique to quantify the effect of a commercial SRU (Optigen, Alltech Inc., Nicholasville, KY, USA) on the performance of beef cattle. Data were extracted from 17 experiments and analysed using the random-effects model to estimate the effect size of SRU on dry matter intake (DMI), crude protein intake (CPI), live weight gain (LWG) and feed efficiency (FE) of growing and finishing beef cattle. There was no effect of feeding SRU on the overall DMI and CPI of beef cattle. Dietary inclusion of SRU improved the overall LWG (+92 g/d/head) and FE (+12 g LWG/kg DMI/head) of beef cattle. Notably, SRU supplementation in growing cattle exhibited a better improvement on LWG (130 vs. 60 g/d/head) and FE (18 vs. 8 g LWG/kg DMI/head) compared with finishing cattle. Moreover, SRU showed consistent improvements on the LWG and FE of beef cattle under several study factors. Simulation analysis indicated that positive effects of SRU on LWG and FE improved profitability through reduction in feed cost and reduced the emission intensity of beef production. These results indicate that SRU is a sustainable NPN solution in beef cattle production.
缓释尿素（SRU）是一种用于反刍动物营养的包膜非蛋白氮（NPN）来源。本研究应用荟萃分析技术来量化一种商业缓释尿素（Optigen，美国肯塔基州尼古拉斯维尔市的奥特奇公司）对肉牛生产性能的影响。从17项试验中提取数据，并使用随机效应模型进行分析，以估计缓释尿素对生长育肥牛干物质采食量（DMI）、粗蛋白摄入量（CPI）、体重增加（LWG）和饲料效率（FE）的效应大小。饲喂缓释尿素对肉牛的总体干物质采食量和粗蛋白摄入量没有影响。日粮中添加缓释尿素提高了肉牛的总体体重增加（+92克/天/头）和饲料效率（+12克体重增加/千克干物质采食量/头）。值得注意的是，与育肥牛相比，生长牛补充缓释尿素在体重增加（130对60克/天/头）和饲料效率（18对8克体重增加/千克干物质采食量/头）方面表现出更好的改善。此外，在几个研究因素下，缓释尿素对肉牛的体重增加和饲料效率都有持续的改善。模拟分析表明，缓释尿素对体重增加和饲料效率的积极影响通过降低饲料成本提高了盈利能力，并降低了牛肉生产的排放强度。这些结果表明，缓释尿素是肉牛生产中一种可持续的非蛋白氮解决方案。
