【作者】 张召辉； 安代志； 颜培实；

【Author】 ZHANG Zhao-hui, AN Dai-zhi, YAN PS (College of Animal Science, Naijing Agricultural University, Naijing 210095)

【机构】 南京农业大学动物科技学院；

【摘要】 选择泌乳中期奶牛10头,随机分成日粮阴阳离子平衡(DCAB)的早、夕、晚三次调剂组(A组)和早朝一次调剂组(B组),剖析DCAB不同调剂时间对暑热期奶牛生产、酸碱和矿物质平衡的影响。结果表明,DCAB早朝调剂组奶牛的采食量和产奶量分别提高16.7%(P<0.05)和19.4%(P<0.01),并且,乳蛋白、乳脂、乳糖等亦有改善的趋势,差异不显著;14:00尾静脉血样测定表明,血液Na+、K+离子浓度差异并不显著,但血液pH、pCO2和HCO3-等血气指标增高,特别是B组碱储为正值,而A组为负值;尿液pH升高(P<0.05),Na+、K+、Cl-离子排出量有增加趋势,尿液电解质平衡值([Na+]+[K+]-[Cl-])降低。更多还原

【Abstract】 Ten mid-lactation Holstein cows were assigned randomly to group A (ter in 7:00、15:00、23:00) or group B (one sitting in 7:00), and administration time–dependent influence of dietary cation-anion balance on performance, acid-base and mineral status under summer condition in dairy cows were studied with the same ion salt. The one sitting group significantly influenced the performance of heat-stress dairy cows. Intake of DM and 4% FCM increased16.7%(P<0.05)and19.4%(P<0.01), respectively; Expect of NFC(P<0.01), milk fat、protein、lactose and rough mineral were not altered by administration time of dietary cation-anion balance; Blood samples taken from the caudle vein at 14:00 indicated that blood Na+、k+ and Ca2+ and blood pH、carbon dioxide partial pressure and HCO3- concentration were not altered by the administration time, Blood base excess increased in B, but the difference between groups was not significant. Urine pH was increased(P<0.05),and the excretion of urinary Na+、 K+ and Cl- had the tendency to be raised. And the urine electrolyte balance (Na+K-Cl ) was decreased.更多还原