果穗率对改善玉米青贮饲料发酵品质和营养价值的作用

发布时间：2018-10-09 13:40

【摘要】：为明确玉米果穗率在提高青贮饲料发酵品质和营养价值中的作用,以云南和江苏的15个玉米品种(系)为材料,采用完全随机区组设计进行了2年田间试验。结果表明,供试品种(系)在长江下游地区生长良好,生物产量23.1~40.4t/hm~2,果穗率0.42~0.59。成熟期收获青贮,果穗率与青贮饲料pH值呈极显著负相关(r=-0.407**);与青贮饲料乳酸含量和氨态氮/总氮分别呈极显著正相关(r=0.754**)和负相关(r=-0.606**)。果穗率与青贮饲料的水溶性碳水化合物含量呈极显著正相关(r=0.694**),与青贮饲料粗蛋白含量呈极显著正相关(r=0.450**),与青贮饲料可消化干物质量呈极显著正相关(r=0.718**)。高果穗率对青贮饲料发酵品质和营养价值均有显著改善作用,生产上应将提高果穗率作为改善玉米青贮饲料品质的重要措施。
[Abstract]:In order to clarify the role of ear rate in improving the fermentation quality and nutritional value of silage, a 2-year field experiment was conducted with 15 maize varieties (lines) from Yunnan and Jiangsu provinces. The results showed that the tested varieties (lines) grew well in the lower reaches of the Yangtze River with a biological yield of 23.1 ~ 40.4t / hm ~ (-2) and a ear rate of 0.42 (0.59). There was a significant negative correlation between ear rate and pH value of silage at maturity stage (r = -0.407 *), a significant positive correlation between ear rate and the content of lactic acid and ammonia nitrogen / total nitrogen in silage (r = 0.754 ~ *) and a negative correlation between ear rate and pH value of silage (r ~ + -0.606 ~ *), respectively. There was a very significant positive correlation between ear rate and water soluble carbohydrate content in silage (r 0.694 ~ *), crude protein content in silage (r ~ 0. 450 ~ *) and digestible dry matter quality (r ~ 0. 718 ~ *). The high ear rate can improve the fermentation quality and nutrition value of silage significantly. Therefore, it is important to improve the quality of corn silage by increasing the ear rate.
【作者单位】：南京农业大学动物科技学院;
【基金】：国家科技支撑计划项目(2012BAD12B10) 江苏省农业三新工程项目(SXGC[2014]308)资助
【分类号】：S816.53

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