We investigated the effect of chromium (Cr) supplementation on the growth performance, energy metabolites, and hormonal variation in winter-exposed buffalo calves. Twenty-four female buffalo calves were randomly allotted to four dietary treatments (n = 6) for a period of 120 days. Feeding regimen was the same in all the groups, except the animals in the four respective groups were additionally supplemented with 0.0, 0.5, 1.0, and 1.5 mg of Cr/kg DM in the form of CrCl3.6H2O. Calves were monitored daily for physiological variables and dry matter intake (DMI). Blood samples were collected at fortnightly intervals from each buffalo calves to measure concentrations of hormones (insulin, cortisol, and growth hormone), energy metabolites (glucose and non-esterified fatty acids), and plasma mineral levels. After 120 days of feeding trial, buffalo calves fed with Cr had lower (P < 0.05) circulating plasma concentrations of glucose, insulin, and cortisol hormones, whereas plasma thyroid hormone and non-esterified fatty acids concentrations were found similar (P > 0.05) among all the treatments. The results suggested that dietary Cr supplementation influenced plasma Cr levels without affecting the plasma concentrations of other trace minerals. However, physiological variables, nutrient intake, and growth performance of buffalo calves did not differ among all treatments (P > 005). In summary, the current study showed that supplementation of Cr at the level of 1.0 and 1.5 mg of Cr/kg DMI was more effective in improving glucose utilization by increasing potency of insulin hormone and reducing concentration of cortisol hormone. Results also suggested that supplemental Cr also improves blood plasma Cr levels.

译文

我们研究了补充铬 (Cr) 对冬季暴露的水牛犊牛的生长性能,能量代谢产物和激素变化的影响。24只雌性水牛被随机分配到四种饮食治疗 (n =   6) 中,为期120天。所有组的喂养方案都是相同的,除了四个相应组的动物另外补充了0.0、0.5、1.0和1.5 mg CrCl3.6H2O形式的Cr/kg DM。每天监测小牛的生理变量和干物质摄入量 (DMI)。每两周从每只水牛犊牛收集血液样本,以测量激素 (胰岛素,皮质醇和生长激素),能量代谢产物 (葡萄糖和非酯化脂肪酸) 和血浆矿物质水平的浓度。经过120天的喂养试验,饲喂Cr的水牛小牛的血浆葡萄糖,胰岛素和皮质醇激素的循环浓度较低 (p  <  0.05),而血浆甲状腺激素和非酯化脂肪酸的浓度在所有处理中相似 (p  >  0.05)。结果表明,饮食中添加Cr会影响血浆Cr水平,而不会影响其他微量矿物质的血浆浓度。然而,水牛犊牛的生理变量、营养摄入量和生长性能在所有处理之间没有差异 (p  >  005)。总而言之,当前的研究表明,通过增加胰岛素激素的效力和降低皮质醇激素的浓度,以1.0和1.5 mg Cr/kg DMI的水平补充Cr在改善葡萄糖利用方面更有效。结果还表明,补充Cr还可以改善血浆Cr水平。

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