模拟高草酸摄入对舍饲绵羊矿物质代谢的影响

Effects of Simulated High Oxalic Acid Intake on Mineral Metabolism of Sheep by House Feeding

试验以绵羊为研究对象,通过添加不同浓度草酸的舍饲试验,探讨草酸对绵羊常量与微量矿物质元素代谢的影响,旨在为高草酸含量饲草利用与草酸盐中毒风险提供理论依据。试验采用单因素设计,随机将24只德国肉用美利奴绵羊(32.08 kg±3.43 kg)分成3个处理组,每个处理组8个重复,试验处理分别在T1组日粮中添加1%草酸(H_(2)C_(2)O_(4)),T2组添加2%草酸,对照组不添加。正式试验期共60 d。结果表明,2%高草酸添加相较于1%低草酸对于绵羊矿物质代谢的影响更大;添加2%草酸显著降低了钙、磷、镁、硫吸收量、沉积量和表观消化率;与1%草酸添加组相比,添加2%草酸显著降低了铁和铜的吸收量、沉积量及铁的表观消化率;添加1%草酸仅影响了磷沉积量、吸收量与镁沉积量;两种浓度草酸均不同程度地降低了瘤胃内锌、铁和锰元素浓度,是否会改变瘤胃微生物发酵功能还需深入研究。因此,当家畜日粮草酸浓度高于2%时,应该更加关注家畜体内矿物元素平衡与缺乏的问题。

Sheep were used as the research object in this experiment,and the effects of oxalic acid on the metabolism of major and trace mineral elements of sheep were evaluated through the experiment of feeding oxalic acid with different concentrations in the house,aiming to provide theoretical basis for the utilization of forage with high oxalic acid content and the risk of oxalate poisoning.Twenty-four German Merino sheep(32.08 kg±3.43 kg BW)were randomly divided into three treatment groups with 8 replicates per group.T1 group was supplemented 1%oxalic acid(H_(2)C_(2)O_(4))in the diet,T2 group was supplemented 2%oxalic acid,and control group was not supplemented.The formal trial lasted for 60 days.The results showed that 2%high oxalic acid had greater effect on mineral metabolism of sheep than 1%low oxalic acid.The absorption,deposition and apparent digestibility of calcium,phosphorus,magnesium and sulfur were significantly reduced by 2%oxalic acid.Compared with 1%oxalic acid addition group,the absorption,deposition and apparent digestibility of iron and copper were significantly decreased.1%oxalic acid only affects the amount of phosphorus deposition,absorption and magnesium deposition.Both oxalic acid concentrations reduced the concentrations of zinc,iron and manganese in the rumen to varying degrees,and whether they would change the microbial fermentation function in the rumen needs further study.Therefore,more attention should be paid to the balance and deficiency of mineral elements in livestock when the dietary oxalic acid concentration is higher than 2%.