Dietary supplementation with red cabbage extract rich in anthocyanins increases urinary hippuric acid excretion and consequently decreases nitrous oxide emissions in beef bulls
Dietary supplementation with red cabbage extract rich in anthocyanins increases urinary hippuric acid excretion and consequently decreases nitrous oxide emissions in beef bulls
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膳食补充富含花青素的红甘蓝提取物可增加尿中马尿酸的排泄，从而减少肉牛的一氧化二氮排放量
DOI：
10.1016/j.anifeedsci.2021.115075
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发表时间：
2021-09-15
影响因子：
3.2
通讯作者：
Zhao, Guangyong
中科院分区：
文献类型：
--
作者：
Gao, Jian;Cheng, Bingbing;Zhao, Guangyong
本试验旨在研究饲粮中添加富含花青素的红白菜提取物（RCE）对肉牛体内氮(N)代谢及肉牛尿液所施土壤氧化亚氮（N2O）排放的影响。试验1选用8头体重387.9±40.7 kg的西门塔尔肉牛作为实验动物。在基础日粮中添加2个水平的RCE，即每天0和114 g干物质。动物和处理按2 × 2交叉设计分配。在实验2中，采用静态培养技术测定了实验1收集的尿液样本所施用的土壤中N2O-N的排放量。试验1结果表明，添加RCE对肉牛的N排泄、N滞留和N滞留率无显著影响（P 0.05），有提高肌酐-N/尿N比值的趋势（P = 0.081），但不影响其他尿氮组分的排泄（P 0.10）。血浆代谢组分析显示，RCE上调了12种代谢物，下调了18种代谢物（P < 0.05）。试验2结果表明，RCE通过降低N2O-N/尿n比值，使估算尿N2O-N排放量降低33.1% （P < 0.05）。综上所述，饲粮中添加RCE对肉牛的氮潴留和氮排泄没有影响，但通过增加尿中马尿酸的排泄量，减少了肉牛尿液中N2O-N的排放。
Two consecutive experiments were conducted to investigate the effects of dietary supplementation with red cabbage extract (RCE) rich in anthocyanins on the nitrogen (N) metabolism in beef bulls and the nitrous oxide (N2O) emissions from the soil applied with the urine of beef bulls. In Experiment 1, 8 Simmental beef bulls (body weight 387.9 +/- 40.7 kg) were used as experimental animals. Two levels of RCE, i.e. 0 and 114 g dry matter per day, were supplemented to a basal ration as experimental treatments. The animals and the treatments were allocated in a 2 x 2 crossover design. In Experiment 2, the static incubation technique was used to determine the N2O-N emissions from the soil applied with the urine samples collected from Experiment 1. The results of Experiment 1 indicated that RCE supplementation did not affect the N excretion, N retention, and N retention rate in beef bulls (P 0.05) and tended to increase the ratio of creatinine-N/ urinary N (P = 0.081) without changing the excretion of other urinary nitrogenous components (P 0.10). Plasma metabolome analysis indicated that RCE supplementation upregulated 12 metabolites while downregulated 18 metabolites (P < 0.05). The results of Experiment 2 indicated that RCE supplementation reduced the estimated urine N2O-N emissions by 33.1% through decreasing the ratio of N2O-N/urine-N (P < 0.05). In conclusion, RCE supplementation did not affect the N retention and N excretion of beef bulls, whereas it attenuated the urine N2O-N emissions of beef bulls through increasing urinary hippuric acid excretions.