The objective of this study was to evaluate the effects of lasalocid on rumen fermentation and urinary purine derivatives in Simmental cattle. Forty-eight 12-months-old Simmental bulls with good body condition and similar body weight were divided into four groups at random. The control group was fed basic diet. The supplement of lasalocid with 100, 200 and 300 mg per cattle per day was added to the basic diet, respectively. Three cattles in each group were selected randomly to do digestion metabolism experiments after feeding experiments. The results showed that ruminal acetate content, ammonia N concentration in groups supplemented lasalocid at 200mg/d and 300mg/d were lower than that of in control group (P<0.05). Concentrations of urinary allantion and purine derivatives in groups supplemented lasalocid at 200mg/d and 300mg/d were higher than that of in control group and group supplemented lasalocid at 100mg/d (P<0.05). The study showed that the addition of lasalocid in beef cattle diet could improve rumen fermentation and nitrogen utilization, the optimal dose of lasalocid was 200mg/d.%本试验旨在评价拉沙里菌素对西门塔尔牛瘤胃发酵的影响.选取12月龄左右、体重相近、体况良好的西门塔尔牛48头,随机分为4组.对照组饲喂基础日粮,处理组分别在基础日粮基础上添加拉沙里菌素100、200和300mg/(头·d).结果表明,日粮中添加拉沙里菌素200mg/(头·d)和300mg/(头·d)时,瘤胃内乙酸含量、氨态氮浓度显著低于对照组(P<0.05),尿中嘌呤衍生物含量显著增加(P<0.05).试验表明,日粮添加拉沙里菌素能改善瘤胃发酵和氮的利用,从而提高生产性能和减少甲烷排放,其适宜添加量为200mg/(头·d).
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机译：提议将专性嘌呤发酵细菌酸尿梭菌（Barker1938年）和嘌呤梭菌（Dürre等1981年）重新分类为酸尿杆菌。十一月梳子。十一月和圣沙克亚purinilytica梳子。十一月和安氏真细菌（Beuscher and Andreesen 1985）作为安氏安第斯氏菌。十一月梳子。十一月在家庭Gottschalkiaceae家族中。十一月
