粮饲兼用型玉米全株饲用营养价值及其调控

Studies on the nutritive values of whole plant for feeding and it's regulation of feed Zea mays

选用了在四川当地适合作青贮的粮饲兼用型玉米品种川单21、成单22、雅玉8号和燎原青贮玉米2号及从新疆引进的专用青贮玉米品种新青2号,研究不同种植密度下各品种全株粗蛋白、粗脂肪产量和消化能,旨在筛选优质青贮玉米品种、适宜的种植密度及收获时期.结果表明,粮饲兼用型玉米的全株粗蛋白、粗脂肪产量和消化能较高,其中以雅玉8号表现最优;适宜的种植密度为127 500株/hm2;粮饲兼用型玉米作为青贮饲料的适宜收获时间与作为粮食收获籽粒的时间一致,抽丝后35～42 d左右收获,新青2号在抽丝后28 d收获可获得最佳的青贮玉米饲料价值,在抽丝后35 d收获可获得较高的粮食产量.

Two types of silage Z. rnays, feed Z. rnays and typical silage Z. rnays, were studied for the nutritive values：crude protein yields, crude fat yields and DE,in this experiment. The feed Z. mays varieties studied were Chuandan 21（CD21） ,Chengdan 22（CD22） ,Liaoyuanqingzhu No. 2（LYQZ2） ,Yayu No. 8（YY8） ,while the typi cal silage Z. mays studied was Xingqing No. 2（XQ2）. The nutritive values of whole plants were determined with optimal feeding in different plant densities, super-quality varieties,optimum plant density and harvesting time, determined. The results indicated that the nutritive values of feed Z. rnays were higher than that of the typical silage Z. mays XQ2,with YY8 the highest. The optimum plant density and harvesting time were selected, 127 500 plants/hm^2 was the optimum plant-density for silage Z. rnays,the feed Z. rnays could be harvested 35-42 d after silking,with the typical silage Z. mays harvest possible 28 d after silking,although if used for food it could not be harvested until 35 d after silking.