玉米类型和生育时期对其青贮饲料品质的影响

Effect of maize types and growth developmental stage on the silage quality

选用普通型玉米‘先玉335’和青贮型玉米‘三北青贮17’为试验材料,在不同生育时期收获后进行青贮处理,以研究品种类型和收获期对其青贮品质的影响。结果表明:玉米类型对其全株青贮饲料的发酵品质和营养品质无显著影响,对其秸秆青贮的发酵品质亦无显著影响,但青贮型玉米的营养品质显著高于普通型玉米;随生长时间的延长,全株青贮饲料的干物质(DM)含量上升,而粗蛋白(CP)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)含量下降,腊熟初期到末期时,粗饲料分级指数(GI)相对较高。本研究表明燕山一年一熟制地区制作青贮饲料时选用青贮型玉米品种为宜,最佳收获期为腊熟初期到末期之间。

This paper has studied the effect of maize types and growth developmental stage on silage quality by selecting ordinary type maize of ‘Xianyu 335’ and silage type maze of‘Sanbei 17’ as experimental materials and making maize silage in different growth stages .The results showed that the maize type did not have obvious impact on fermentative quality and nutritive quality of the whole maize silage ,or on fermentative quality of the maize stalk silage .Howev‐er ,the nutritive quality of silage type maize of ‘Sanbei 17’ was better than the ordinary type＆amp;nbsp;maize of‘Xiannyu 335’ .As the plant growing ,the dry matter （DM） of whole maize silage in‐creased w hile the crude protein （CP） ,neutral detergent fiber （NDF） and acid detergent fiber （ADF） decreased .When the plant reached the early dough stage to late dough stage ,the for‐age grading index （GI） value was relatively higher than any other ages .The study proved that it is better to choose silage type maize w hen making maize silage and the best time to harvest should be from early dough stage to late dough stage in Yanshan Mountain area .