机构地区:[1]宁夏回族自治区畜牧工作站,银川750002 [2]吴忠市利通区畜牧兽医技术服务中心,宁夏吴忠751100 [3]宁夏回族自治区水利调度中心,银川750002 [4]宁夏农林科学院动物科学研究所,银川750002
出 处:《黑龙江畜牧兽医》2024年第14期81-87,共7页Heilongjiang Animal Science And veterinary Medicine
基 金:宁夏全产业链“十三五”重大专项“中部干旱带草畜耦合技术研究”(YES-16-02);宁夏自然科学基金项目(NZ17135)。
摘 要:为了探究不同生长年限柠条在肉牛瘤胃中的降解特性,试验根据柠条生长年限设定5个试验组,分别为试验1组(1年生柠条)、试验2组(2年生柠条)、试验3组(3年生柠条)、试验4组(4年生柠条)和试验5组(10年生柠条),各组样品整株剪成1 cm茎段后粉碎过筛,装入自制尼龙袋中,每组3个重复,每个重复7个尼龙袋,分别于投喂后第6,12,18,24,36,48,72小时取出尼龙袋冲洗,烘干,经过粉碎、过筛后测定常规营养成分[干物质(DM)、粗蛋白(CP)、粗脂肪(EE)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)、粗灰分(Ash)]含量并计算瘤胃实时降解率、有效降解率等相关指标。结果表明:试验5组DM(55.11%)、NDF(69.88%)、ADF(59.55%)、Ash(6.51%)含量均最高,试验1组CP含量(15.36%)最高,试验2组EE含量(4.22%)最高;试验1组CP、EE、NDF、ADF含量与试验2组差异不显著(P>0.05),而试验3组仅CP含量极显著低于试验1组(P<0.01)。随着瘤胃降解时间延长,各组DM、CP、NDF和ADF的瘤胃降解率均逐渐增加,第72小时达到最大,DM、CP的瘤胃降解率以试验2组最优,分别为68.10%、75.84%;NDF、ADF瘤胃降解率以试验1组最优,分别为59.85%、50.79%。说明在本试验条件下,柠条在1~3年生长期营养成分总体差别不大,但1年生柠条不利于柠条林生态恢复,2年柠条具有较优常规营养成分和瘤胃降解特性,因此2年生柠条是饲喂草食家畜最适生长年限。To investigate the degradation characteristics of caragana with different growth years in rumen of beef cattle,five experimental groups were set according to the growth years of caragana,which were experiment group 1(one-year-old),experiment group 2(second-year-old),experiment group 3(third-year-old),experiment group 4(fourth-year-old)and experiment group 5(10-year-old).The whole plant samples in each group were cut into 1 cm stem segments,crushed and sieved,and then put into self-made nylon bags.Each group had three parallel samples and each group had seven nylon bags.The nylon bags were rinsed and dried at the 6,12,18,24,36,48,72 hours after feeding,respectively.The conventional nutrients(dry matter[DM],crude protein[CP],crude fat[EE],neutral detergent fibre[NDF]acid detergent fibre[ADF],and crude ash[Ash])were determined after grinding and sifting,and the relevant indexes such as real-time degradation rate and effective degradation rate were calculated.The results showed that the contents of DM(55.11%),NDF(69.88%),ADF(59.55%),and Ash(6.51%)in experiment group 5 were all the highest;the CP content(15.36%)was the highest in experiment group 1,and the EE content(4.22%)was the highest in experiment group 2;there were no significant differences in the contents of CP、EE、NDF and ADF between the experiment group 1 and the experiment group 2 with the extension of caragana growth years(P>0.05),while only CP content in the experiment group 3 was significantly lower than that in the experiment group 1(P<0.01).With the extension of rumen degradation time,the rumen degradation rates of DM,CP,NDF and ADF in each group gradually increased,and reached the maximum at 72 hours.The rumen degradation rates of DM and CP were the best in the experiment group 2,which were 68.10%and 75.84%,respectively.The rumen degradation rates of NDF and ADF were the best in the experiment group 1,which were 59.85%and 50.79%,respectively.The results indicated that under the conditions of this experiment,there was little difference in the nutrit
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