Prepartum behaviors as early indicators for postpartum energy associated biomarkers status in Holstein dairy cows.

M H Emam, E Shepley, M M Mahmoud, M Ruch, S Elmaghawry, W Abdelrazik, A M Abdelaal, B A Crooker, L S Caixeta
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Abstract

Our main aim was to investigate the predictive value of prepartum behaviors such as total daily rumination (TDR), total daily activity (TDA) and dry matter intake (DMI) as early indicators to detect cows at risk for hyperketonemia (HYK), hypoglycemia (HYG) or high non-esterified fatty acid (NEFA) status in the first (wk1) and second week (wk2) postpartum. In a case control study, 64 Holstein cows were enrolled 3 weeks before the expected time of calving and monitored until 15 days in milk (DIM). Postpartum blood samples were taken at D3 and D6 for wk1 and at D12 and D15 for wk2 to measure beta-hydroxybutyrate, NEFA and glucose concentration. Ear-mounted accelerometers were used to measure TDR and TDA. DMI and milk yield were obtained from farm records. Relationships between the average daily rate of change in prepartum TDR (ΔTDR), TDA (ΔTDA), and DMI (ΔDMI) with postpartum HYK, HYG and NEFA status in wk1 and wk2 post-partum were evaluated using linear regression models. Models were adjusted for potential confounding variables, and covariates retained in the final models were determined by backward selection. No evidence was found to support the premise that prepartum ΔTDR, ΔTDA or ΔDMI predicted postpartum HYK, HYG or NEFA status in wk1 or in wk2. Overall, prepartum ΔTDR, ΔTDA and ΔDMI were not effective predictors of HYK, HYG or NEFA status in the first 2 weeks postpartum.

产前行为是荷斯坦奶牛产后能量相关生物标志物状况的早期指标。
我们的主要目的是研究产前行为的预测价值,如每日反刍总量(TDR)、每日活动总量(TDA)和干物质摄入量(DMI),作为早期指标检测奶牛在产后第一周(wk1)和第二周(wk2)的高酮血症(HYK)、低血糖(HYG)或高非酯化脂肪酸(NEFA)状态风险。在一项病例对照研究中,64 头荷斯坦奶牛在预产期前 3 周被纳入研究,并接受监测直至产奶 15 天(DIM)。产后第 1 周在第 3 天和第 6 天采集血液样本,第 2 周在第 12 天和第 15 天采集血液样本,以测量β-羟丁酸、NEFA 和葡萄糖浓度。耳挂式加速度计用于测量TDR和TDA。DMI和产奶量来自牧场记录。使用线性回归模型评估了产前TDR(ΔTDR)、TDA(ΔTDA)和DMI(ΔDMI)的平均日变化率与产后第1周和第2周的HYK、HYG和NEFA状态之间的关系。模型对潜在的混杂变量进行了调整,并通过反向选择确定了最终模型中保留的协变量。没有证据表明产前ΔTDR、ΔTDA或ΔDMI可预测产后第1周或第2周的HYK、HYG或NEFA状况。总体而言,产前ΔTDR、ΔTDA和ΔDMI不能有效预测产后头两周的HYK、HYG或NEFA状况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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