奶牛静脉血、胎盘组织、脐静脉血及犊牛静脉血脂联素与犊牛初生重相关性研究
Correlation between adiponectin in cows' venous blood,placenta, cord blood,calves venous blood and calf birth weight

为探究奶牛静脉血、胎盘组织、脐静脉血和犊牛静脉血中脂联素之间及与犊牛初生重的相关性，选取规模化养殖场正常分娩奶牛54头，按犊牛初生重将奶牛分为3组：A组，≤40 kg，9头；B组，40~45 kg，25头；C组，≥45 kg，20头。分别采集分娩奶牛颈静脉血、胎盘组织、脐静脉血及犊牛颈静脉血，ELISA法检测血液及胎盘组织脂联素水平，相关分析法分析各样品之间及与犊牛初生重的相关性。奶牛静脉血脂联素水平（（29.15±4.02）mg/L）高于脐静脉血（（13.79±1.14）mg/L）与犊牛静脉血（（13.46±0.94）mg/L）脂联素水平，差异极显著（P<0.01），脐静脉血脂联素水平高于犊牛静脉血脂联素水平，但差异性不显著（P>0.05）；奶牛静脉血脂联素水平与胎盘组织、脐静脉血、犊牛静脉血脂联素水平以及胎盘组织脂联素水平与脐静脉血、犊牛静脉血脂联素水平相关性均不显著（P>0.05），脐静脉血脂联素水平与犊牛静脉血脂联素水平极显著正相关（P<0.01）；犊牛初生重与奶牛静脉血脂联素水平无显著相关性（P>0.05），与脐静脉血、胎盘组织脂联素水平极显著正相关（P<0.01），与犊牛静脉血脂联素水平显著正相关（P<0.05）；奶牛静脉血、胎盘组织、脐静脉血脂联素水平及犊牛静脉血脂联素水平在公、母犊间差异均不显著（P>0.05）。脐静脉血、胎盘组织脂联素水平对犊牛初生重有非常显著的影响，犊牛静脉血脂联素水平对犊牛初生重具有一定影响，而奶牛静脉血脂联素水平对犊牛初生重的影响不显著；奶牛静脉血、脐静脉血、胎盘组织及犊牛静脉血脂联素水平在公、母犊间差异均不显著。
The aim of this study was to explore the correlation between the calf birth weight and the adiponectin in cows' venous blood,placenta,cord blood and calves' venous blood.Based on the calf birth weight,54 healthy Chinese Holstein cows with normal delivery term were divided into 3 groups:Group A (≤40 kg,n=9),Group B (40~45 kg,n=25) and Group C (≥45 kg,n=20).ELISA was used to evaluate the level of adiponectin in cows' venous blood,placenta,cord blood and calves' venous blood.The correlation between adiponectin and calf birth weight were analyzed by correlation analysis method for further study.Adiponectin levels in cows' venous blood ((29.15±4.02)mg/L) were significantly higher than that in cord blood ((13.79±1.14) mg/L) and calves' venous blood ((13.46±0.94)mg/L) (P<0.01);Adiponectin levels in cows' cord blood were higher than that in venous blood of calves,but the differences were not significant (P>0.05).Adiponectin levels in cows' venous blood had no significant correlation with that in placenta,cord blood and calves' venous blood (P>0.05) and adiponectin levels in placenta also had no significant correlation with that in cord blood and calves' venous blood (P>0.05).However,adiponectin levels in cord blood had highly significantly positive correlation with that in venous blood of cows (P<0.01).The calf birth weight had no significant correlation with the adiponectin levels in cows' venous blood (P>0.05),while it had highly significantly positive correlation with adiponectin levels in cord blood and placenta (P<0.01) and had significantly positive correlation with adiponectin levels in calves' venous blood (P<0.05).Adiponectin levels in cows' venous blood,placenta,cord blood and calves' venous blood had no significantly differences between male and female calves (P>0.05).In conclusion,adiponectin levels in cows' cord