Azadbakht S, Khadem A A, Norouzian M A
Department of Animal and Poultry Sciences, College of Abouraihan, University of Tehran, P.O. Box 11365-4117, Tehran, Iran.
Environ Sci Pollut Res Int. 2017 Feb;24(6):5426-5430. doi: 10.1007/s11356-016-8263-z. Epub 2016 Dec 26.
Two experiments were conducted to investigate the effect of supplemental bentonite on performance, blood, and fermentation characteristics in Zandi lambs. In experiment 1, 20 Zandi male lambs (initial BW, 17.5 ± 1.6 kg and 110 ± 5 days old) were randomly assigned into four groups of five animals in each. The experimental treatments were (1) control (no Pb and bentonite), (2) 15 mg/kg DM Pb as Pb acetate and no bentonite, (3) 15 mg/kg DM Pb as Pb acetate and 1.5% bentonite, and (4) 15 mg/kg DM Pb as Pb acetate and 3% bentonite. The dietary treatments had no significant effect on dry matter intake of experimental lambs. Feed required per unit of weight gain was more (P < 0.05) in lead-exposed lambs in group 2 compared to the control and bentonite supplemented groups. Serum glucose, urea nitrogen, cholesterol, HDL, and LDL concentrations was similar among the treatments. In experiment 2, an in vitro gas production technique was used to evaluate the effects of bentonite supplementation on the gas production parameters of lead-polluted diets. The rate and amount of gas production was higher for bentonite supplemented groups (P < 0.01). Asymptotic gas production (b), metabolizable energy, and concentration of short chain fatty acids were lower (P < 0.05) for lead-polluted non-supplemented diet (group 2) as compared to the bentonite supplemented and control groups. It was concluded that bentonite supplementation favorably modified ruminal fermentation pattern and improved feed conversion ratio in growing lead-exposed lambs.
进行了两项试验，以研究添加膨润土对赞迪羔羊生产性能、血液和发酵特性的影响。在试验1中，将20只赞迪公羔羊（初始体重17.5±1.6千克，110±5日龄）随机分为4组，每组5只。试验处理为：（1）对照组（不添加铅和膨润土），（2）添加15毫克/千克干物质的醋酸铅且不添加膨润土，（3）添加15毫克/千克干物质的醋酸铅和1.5%膨润土，（4）添加15毫克/千克干物质的醋酸铅和3%膨润土。日粮处理对试验羔羊的干物质采食量没有显著影响。与对照组和添加膨润土的组相比，第2组铅暴露羔羊每单位体重增加所需的饲料更多（P<0.05）。各处理间血清葡萄糖、尿素氮、胆固醇、高密度脂蛋白和低密度脂蛋白浓度相似。在试验2中，采用体外产气技术评估添加膨润土对铅污染日粮产气参数的影响。添加膨润土的组产气速率和产气量更高（P<0.01）。与添加膨润土的组和对照组相比，铅污染未添加膨润土的日粮（第2组）的渐近产气量（b）、代谢能和短链脂肪酸浓度更低（P<0.05）。得出的结论是，添加膨润土有利于改变生长中铅暴露羔羊的瘤胃发酵模式并提高饲料转化率。
