添加丙酸和尿素对玉米青贮品质的影响

Effects of propionic acid and urea on the quality of whole-crop corn silage

以全株玉米(Zea mays)为研究材料,通过对其发酵品质和化学成分的分析,探讨添加丙酸(0.3%)、尿素(0.5%)、丙酸(0.3%)+尿素(0.5%)对袋装全株玉米青贮品质的影响,60d后取样分析。结果表明,全株玉米可以单独调制出良好的青贮料,添加丙酸可以降低青贮饲料的pH值、乙酸和氨态氮含量,并能显著提高全株玉米青贮乳酸含量(P<0.05);添加尿素能显著提高全株玉米青贮的粗蛋白含量(P<0.05);添加丙酸+尿素可以进一步改善全株玉米青贮品质。

A trial was carried out to estimate the effects of proplonie acid and urea on the fermentation quality and chemical compositions of whole-crop corn silage. The treatments included the 0.3 % propionic acid, 0.5% urea, 0.3% propionic acid and 0. 5% urea and all corn were placed in sealed vacuum plastic bags and ensiled for 60 days. The results of this study showed that application of propionic acid decreased pH value, acetic acid and ammonia nitrogen content, and significantly increased the lactic acid content of silage corn （P〈0.05） when compared with control. The application of urea markedly improved the crude protein content of silage corn （P〈0.05）. The combination of propionic acid and urea further improved the fermentation quality of silage.