单宁酸对绵羊日粮养分消化利用及氮代谢的影响

发布时间：2018-06-08 07:33

本文选题：绵羊 + 单宁酸　；参考：《草业学报》2017年12期

【摘要】：通过在饲料中添加不同比例的分析纯单宁酸(鞣酸),对绵羊营养物质消化利用及氮代谢参数的影响进行了研究,并探讨分析纯单宁酸在饲粮中的适宜添加量。试验选用4只安装永久性瘤胃瘘管的羯绵羊(2岁,平均体重为35±2.15 kg)作试畜,采用4×4拉丁方设计进行试验,研究了饲粮单宁酸水平(A、B、C、D分别为0、10、15、20 g/kg DM)对绵羊养分消化利用与氮代谢参数的影响,16 d(预试期10 d,正试期6 d)为一个饲粮循环,全期共64 d。结果表明,高浓度单宁酸(20 g/kg DM)影响绵羊的采食量,进而影响绵羊对干物质(DM)、有机物(OM)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)的食入量(P0.01);但随着单宁酸浓度的增加,绵羊对DM、OM、NDF、ADF、Ca、P的消化率并无显著影响(P0.05);处理组A、B、C的N食入量与N消化量极显著高于D(P0.01),N存留率随单宁酸比例的增大而升高,仅C处理组显著高于A(P0.01);N消化率、p H、总N浓度差异不显著(P0.05);而瘤胃液NH3-N浓度和尿素氮(BUN)呈线性下降,A的NH3-N显著高于D(P0.05),而其血浆尿素氮(BUN)高于C、D(P0.01)。可见,单宁酸具有提高蛋白质在绵羊体内消化吸收的功效;饲粮中单宁酸含量小于15 g/kg DM时,能够显著提高氮存留率,对蛋白质保护的效果较好;故单宁酸在饲粮中的添加量不应该超过15 g/kg DM。
[Abstract]:The effects of different proportions of analytical tannic acid (tannic acid) on nutrient digestibility and nitrogen metabolism parameters of sheep were studied, and the optimum addition of pure tannic acid in diet was discussed. Four sheep, aged 2 years old with permanent rumen fistula, with an average body weight of 35 卤2.15 kg, were used in the experiment, and 4 脳 4 Latin square design was used to carry out the experiment. The effects of dietary tannic acid level on nutrient digestibility and nitrogen metabolism parameters of sheep were studied in this paper. The effects of dietary tannic acid level on nutrient digestibility and nitrogen metabolism parameters of sheep were studied for 16 days (10 days in pretest period and 6 days in trial period) as a diet cycle, with a total duration of 64 days. The effects of dietary tannic acid level on nutrient digestibility and nitrogen metabolism parameters of sheep were studied. The results showed that high concentration of tannic acid (20 g/kg) affected the feed intake of sheep, and then affected the feed intake of dry matter (DMN), organic matter (OMN), neutral detergent fiber (NDF) and acid detergent fiber (ADF), but with the increase of tannic acid concentration, The N intake and N digestibility of the treatment group were significantly higher than that of the control group, and the N retention rate increased with the increase of the tannic acid ratio, but the N digestibility of the treatment group was significantly higher than that of the control group, and the N digestibility of the treatment group was significantly higher than that of the control group, and the N digestibility of the treatment group was significantly higher than that of the control group. The digestibility of N in C treatment group was significantly higher than that in Agna P0.01N digestibility, but there was no significant difference in total N concentration (P 0.05), while the NH 3-N concentration in rumen fluid and urea nitrogen bun in rumen fluid decreased linearly. NH3-N in rumen fluid was significantly higher than that in DZP 0.05N, and the plasma urea nitrogen bun (BUNA) was higher than that in CDDP0.01. It can be seen that tannic acid can improve the digestibility and absorption of protein in sheep, and when the content of tannic acid in diet is less than 15 g/kg DM, the nitrogen retention rate can be significantly increased, and the effect of protein protection is better. Therefore, the addition of tannic acid in diet should not exceed 15 g/kg DM.
【作者单位】：甘肃省农业科学院畜草与绿色农业研究所;中国农业科学院饲料研究所农业部饲料生物技术重点实验室;红古区动物疫病预防控制中心;
【基金】：甘肃省农业科学院中青年基金项目;甘肃省农业科学院中青年基金项目(2015GAAS30)资助甘肃省委组织部2016年陇原青年创新创业人才项目
【分类号】：S826.5

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