摘要
本文旨在研究异丁酸对西门塔尔牛瘤胃pH、NH3-N、VFA和营养物质降解率及尿嘌呤衍生物浓度的影响。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中国西门塔尔牛阉牛,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,在基础日粮中分别添加异丁酸0、0.02、0.04和0.06 g/(kgW.d)。结果表明:各组瘤胃pH差异不显著(P>0.05),0.04 g/(kgW.d)组和0.06 g/(kgW.d)组NH3-N浓度极显著低于对照和0.02 g/(kgW.d)组(P<0.01);0.02 g/(kgW.d)组豆粕干物质、有机物和粗蛋白质动态降解率显著高于对照组(P<0.05);0.04 g/(kgW.d)组玉米秸干物质、有机物、中性洗涤纤维和酸性洗涤纤维的降解率显著提高(P<0.05),0.04 g/(kgW.d)组瘤胃乙酸、乙酸/丙酸、总挥发性脂肪酸和尿嘌呤衍生物显著增加(P<0.05)。根据试验结果推断日粮中异丁酸的适宜添加水平为0.04 g/(kgW.d)。
To evaluate the effects of different isobutyrate concentrations on ruminal pH, NH3-N, VFA, nutrients degradability and purine derivatives of urine, four Simmental steers （average BW 420 kg, aged 2.5 years） cannulated in the rumen consuming a corn straw diet were used in a 4 × 4 Latin square design and supplemented with four concentrations（0, 0.02, O. 04 and 0.06 g/（kgW · d）） of supplemental isobutyrate. The results showed that ruminal pH was not affected （P〉0. 05）. The NH3-N concentrations of 0.04 g/（kgW · d） and 0.06 g/（kgW · d） groups were lower than those of control and 0.02 g/ （kgW · d） groups significantly （P〈0.05）. Soybean DM, OM and CP degradability were affected by isobutyrate supplementation with 0.02 g/（kgW · d） （P〈0. 05）. The degradability of DM, OM, NDF and ADF of corn straw supplemented with 0.02 g/（kgW · d） were increased significantly （ P〈0.05）. Ruminal actate, acetate/propionate, TVFA and purine derivatives of urine concentrations were increased significantly （P〈0.05） by isobutyrate supplementation with 0.04 g/（kgW · d）. The supplementation of isobutyrate had passive effect on rumen fermentation. The optimum isobutyrate supplemented dose was 0. 04 g/（kgW · d）. [Chinese Journal of Animal Nutrition, 2006,18（3） ：160-165 ]
出处
《动物营养学报》
CAS
CSCD
北大核心
2006年第3期160-165,共6页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
国家科技成果转化项目(02EFN211401036)
山西农业大学青年基金(2005002)项目资助
关键词
西门塔尔牛
异丁酸
降解率
尿嘌呤衍生物
Simmental steer
Isobutyrate
Degradability
Purine derivatives
