Abstract
选用4头平均体重420 kg、年龄2.5岁装有永久性瘤胃瘘管的西门塔尔牛阉牛,采用4×4拉丁方设计,以混合精料和风干玉米秸秆为基础日粮,以蛋氨酸硒为硒源,在基础日粮中分别添加硒0 mg·kg<sup>-1</sup>、0.3 mg·kg<sup>-1</sup>、0.6 mg·kg<sup>-1</sup>和0.9 mg·kg<sup>-1</sup>,研究蛋氨酸硒对西门塔尔牛瘤胃pH、氨态氮、VFA、营养物质降解率及尿嘌呤衍生物浓度的影响。结果表明:不同浓度硒处理间西门塔尔牛瘤胃pH、挥发性脂肪酸(VFA)和乙酸/丙酸无显著差异(<i>P</i> >0.05),氨态氮浓度显著低于对照(<i>P</i><0.05);0.6 mg·kg<sup>-1</sup>硒处理组西门塔尔牛玉米秸秆干物质(DM)、有机物质(OM)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)和豆粕DM、OM、粗蛋白质(CP)有效降解率均显著高于对照(<i>P</i><0.05);0.6 mg·kg<sup>-1</sup>和0.9 mg·kg<sup>-1</sup>硒处理组西门塔尔牛尿囊素和尿嘌呤衍生物浓度显著高于0.3 mg·kg<sup>-1</sup>组和对照组(<i>P</i><0.05);西门塔尔牛日粮以蛋氨酸硒为硒源时,硒的适宜添加浓度为0.6 mg·kg<sup>-1</sup>。
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