摘要
为研究莫能菌素饲喂肉牛后对日粮养分消化代谢及瘤胃甲烷排放的影响,选用12月龄左右、健康、发育正常的西门塔尔牛48头,按随机设计分成4组,对照组试验牛饲喂由混合精料与玉米秸秆所组成的基础饲粮,其精粗比45∶55,处理1、处理2和处理3组分别在基础日粮基础上添加100、200和300 mg·d-1的莫能菌素,进行为期70 d的试验。结果表明,处理2和处理3的粗蛋白消化率和采食氮显著高于对照组(P<0.05),甲烷能显著低于对照组(P<0.05);处理2和处理3的粪氮和尿氮显著低于对照组和处理1(P<0.05),而可消化氮和沉积氮显著高于对照组和处理1(P<0.05);处理组的氮排泄/采食氮、磷排泄/采食磷显著低于对照组(P<0.05)。综合以上各项指标,当莫能菌素的添加量为300 mg·d-1时,日粮中粗蛋白的消化率、氮利用率提高,氮、磷和甲烷排放降低。
The objective of this study was to evaluate the effects of monensin supplementation on dietary nutrients digestion and emissions of ruminal CH4. Forty-eight Simmental beef cattle（ about 12-month-old）,in good body condition,were randomly divided into 4 groups. The control group was fed the basal diet（ mixed concentrate and corn stover,concentrate to roughage as45 to 55）. TreatmentⅠ,Ⅱ,and Ⅲ were fed monensin at 100,200 and 300 mg · d^-1 respectively. The study lasted 70 days. The results showed that digestion of crude protein and intake nitrogen in treatment Ⅱ and treatment Ⅲ were significantly higher than that of control group（ P 0. 05）,however,the gas energy were significantly lower than that of control group（ P 0. 05）. The faces nitrogen and urine nitrogen in treatment Ⅱ and treatment Ⅲ were significantly lower than that of treatmentⅠ and control group（ P 0. 05）. Digestible nitrogen and nitrogen retention in treatment Ⅱ and treatment Ⅲ were significantly higher than that of treatmentⅠ and control group（ P 0. 05）. The ratio of nitrogen excretion to intake of nitrogen,ratio of phosphorus excretion to intake of phosphorus in treatment Ⅰ,Ⅱ and Ⅲ were decreased significantly compared with control group（ P 0. 05）. The results indicated that digestion of crude protein and utilization of nitrogen were improved,while emissions of nitrogen,phosphorus,and methane were reduced when beef cattle fed monensin at 300 mg·d^-1.
出处
《山西农业大学学报（自然科学版）》
CAS
2014年第6期518-521,共4页
Journal of Shanxi Agricultural University(Natural Science Edition)
基金
山西省科技厅攻关项目(20120311021-2)
山西农业大学横向合作项目(2013HX16)
关键词
莫能菌素
玉米秸秆
消化代谢
氮平衡
西门塔尔牛
Monensin
Corn stover
Nutrients digestion
Nitrogen balance
Simmental cattle
