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高温环境乳牛日粮电解质平衡调节与调剂时间

Administration Time and Changing of Dietary Electrolyte Balance for Dairy Cows in Hot Environments

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【作者】 张召辉安代志颜培实

【Author】 ZHANG Zhao-hui,AN Dai-zhi,YAN Pei-shi (College of Animal Science and Veterinary Medicine,Naijing Agricultural University,Naijing 210095,China)

【机构】 南京农业大学动物科技学院南京农业大学动物科技学院 江苏南京210095江苏南京210095江苏南京210095

【摘要】 选择泌乳中期奶牛10头,随机分成A和B组,设定两组日粮阴阳离子差(DCAD)均为32.4/100g DM,A组日间三次给予,B组是早晨一次添加,研究日粮电解质平衡与调剂时间对热应激奶牛生产、酸碱平衡的影响。结果表明,B组采食量和产奶量分别提高16.7%(P<0.05)和19.4%(P<0.01);乳蛋白、乳脂、乳糖以及乳中矿物质含量亦有增加的趋势,但组间无显著影响;14:00尾静脉血中B组N a、K、Ca离子浓度和血pH以及pCO2和HCO3-浓度组间无明显差异,B组碱储增加,为正值,但组间差异不显著;尿pH升高(P<0.05),N a+、K+、C l-排出量有增加趋势,尿中电解质平衡,DCAD降低。

【Abstract】 Ten mid-lactation Holstein cows were assigned randomly to A or B,and administration time-dependent influence of dietary cation-anion difference on performance,acid-base balance under summer condition in dairy cows were studied with the same ion salt.The results indicated that administration time-dependent of dietary cation-anion difference significantly influenced the performance of heat-stress dairy cows.Intake of DM and 4% FCM increased 16.7%(P<0.05)and 19.4%(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 difference;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.

【基金】 国家科技攻关计划课题:南方农区奶业现代化生产技术集成与产业化示范(2002BA518A12)资助。
  • 【文献出处】 家畜生态学报 ,Ecology of Domestic Animal , 编辑部邮箱 ,2005年04期
  • 【分类号】S823.91
  • 【被引频次】4
  • 【下载频次】145
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