收获期对冬种甜玉米秸秆青贮品质的影响  

Effects of harvest period on silage quality of winter sweet corn straw

作　　者：吴鹏鑫 王胜男 杨伟光 王志敬 尹福泉[1] WU Peng-xin;WANG Sheng-nan;YANG Wei-guang;WANG Zhi-jing;YIN Fu-quan

机构地区：[1]广东海洋大学滨海农业学院,广东湛江524088

出　　处：《饲料研究》2024年第8期114-120,共7页Feed Research

基　　金：雷州山羊繁育体系建立及快大高繁新品系培育(项目编号:2022-XDY-00-009);雷州山羊育繁推一体化关键养殖技术创新集成与示范(项目编号:080503052216);遂溪县城月镇肉羊健康养殖技术示范与推广(项目编号:A23086)。

摘　　要：为探究粤西地区冬种甜玉米秸秆适宜收获期,试验选用粤西地区广泛种植的金银粟2号为试验材料,于广东海洋大学试验田种植,在鲜穗采摘后5、10、15 d收获秸秆,60 d青贮发酵后测定营养成分、发酵品质和瘤胃降解率等。结果表明:随着收获期延长,青贮秸秆的干物质(DM)、粗蛋白(CP)、可溶性糖(SS)、淀粉(Starch)、酸洗不溶蛋白(ADICP)、可溶性蛋白(SCP)、瘤胃降解蛋白(RDP)的含量及24、48 h的中性洗涤纤维降解率(NDFD)和干物质降解率(DMD)均显著增加(P<0.05);其中第15 d收获的秸秆青贮后氨态氮(NH_3-N)、氨态氮/总氮(NH_3-N/TN)以及乙酸(AA)含量占比最高(P<0.05)。研究表明,粤西地区冬种金银粟2号摘穗后15 d收获秸秆为宜。In order to explore the suitable harvest period of winter sweet corn straw in western Guangdong,Jinyinsu NO.2,which is widely planted in western Guangdong,was selected as the test material and planted in the experimental field of Guangdong Ocean University.Straw was harvested 5,10 and 15 days after fresh ears were picked,and the nutrients,fermentation quality and rumen degradation rate were measured after 60 days of silage fermentation.The results showed that with the extension of the harvest period,the contentrations of dry matter(DM),crude protein(CP),soluble sugar(SS),starch,acid detergent insoluble protein(ADICP),soluble protein(SCP),rumen degrading protein(RDP),and the degradation rate of neutral detergent fiber(NDFD)and dry matter degradation rate(DMD)at 24 and 48 h were significantly increased(P<0.05).The contentrations of ammoniacal nitrogen(NH_(3)-N),NH_(3)-N/TN and acetic acid(AA)were the highest in the straw silage harvested on the 15th day(P<0.05).The study indicates that it is advisable to harvest straw 15 days after harvesting the ears for winter planting Jinyinsu NO.2 in western Guangdong.

关 键 词：冬种甜玉米 营养价值 秸秆青贮 发酵品质 瘤胃降解率 

分 类 号：S816[农业科学—饲料科学]