缓释钙弹丸博威钙对预防奶牛产后低血钙的影响

本试验目的是研究缓释钙弹丸博威钙对预防奶牛低血钙的影响。选择二胎及以上胎次的健康母牛30头,根据配对原则随机分为对照组和试验组,每组15头。对照组在产犊前后进行常规饲喂,不喂任何含钙添加剂;试验组在产犊后0h和12h分别投喂一颗缓释钙弹丸。所有试验奶牛分别在产前6h、产犊0h、产后1h、产后13h采集血样、尿样,检测其中钙离子、碱性磷酸酶及其他生化指标的浓度。结果表明,与对照组相比,在两次投喂缓释钙弹丸后各1h(即产后1h及13h),奶牛血钙离子浓度分别提高16.8%和21.1%(P0.05),尿钙离子浓度分别提高77.0%和168.2%(P0.01),但其他血液生化指标如碱性磷酸酶、血糖等无显著变化(P0.05),表明博威钙具有显著提高奶牛血钙离子浓度和尿钙离子浓度的功效。同时,投喂博威钙趋于降低大群奶牛胎衣不下及真胃移位的发生率。

Effects of Bovikalc Bolus on Prevention of Postpartum Hypocalcaemia

This study was conducted to determine the effects of B ovikalc bolus on prevention of postpartum hypocalcaemia. Thirty healthy Holstein muhiparous cows（two or more lactations） were selected and randomly divided by parity into control group and treatment group with 15 cows in each group. Cows in control group received no calcium supplementation. Cows in treatment groups received one bolus immediately after calving and a second bolus 12 hours later. Blood and urine were sampled in pre-6h, calving Oh, post-1h, post-13h, and detected for concentrations of calcium, alkaline phosphatase and other biochemical traits. The results showed that comparing with the group contro], administration of Bovikalc bolus lh after feeding （post-lh and 13h） resulted in serum ionized calcium concentration increased by 16.8% and 21.1%（P〈0.05）, urine ionized calcium concentration increased by 77.0% and 168.2%（P〈0.01）, respectively. The other blood biochemical parameters, however, had no significant change（P〉0.05） due to administration of Bovikalc bolus. Bovikalc bolus significantly improved blood and urine ionized calcium concentration. Meanwhile, Bovikalc bolus tended to reduce the incidence of retained placenta and abomasal displacement.