不同收获期对两种饲用玉米产量及饲用品质的影响

本文对饲用玉米品种农大108(ND108)和山农饲玉7号(SY7)不同收获时间处理下的玉米全株产量及饲用营养品质进行了研究。试验结果表明:收获期是影响玉米全株饲用品质的一个关键因素。随着生育期的推进,两个品种玉米全株的干物质含量、脂肪含量逐渐增加,粗蛋白含量逐渐降低,中性洗涤纤维和酸性洗涤纤维含量先下降而后略上升,生物学产量、各营养成分的产量及饲料总能量均明显增加。综合玉米全株的生物学产量和营养品质,SY7在生长期第85~90d,ND108在第90~95d收获可以获得较高的玉米全株生物学产量和最高玉米饲用价值。两个饲用玉米品种相比,SY7玉米全株生物学产量明显高于ND108;粗蛋白含量、粗纤维含量、总能量储备高于ND108,粗脂肪含量低于ND108,综合衡量玉米全株产量和饲用营养品质,玉米品种SY7要优于ND108。

Effects of Harvest Time on Yield and Quality of Two Different Forage Maize

The experiment was carried out with two varieties of corn(ND108 and SY7) to explore the effects of harvest time on yield and quality of different forage maize.The results showed that harvest time was a key factor that influenced the yield and quality of forage maize.Along with the advancement of growth period,dry matter content and fat content increased,while the content of crude protein decreased,neutral detergent fiber and acid detergent fiber content increased first and then decreased.At the same time,biological yield,the nutrient composition yield and total energy increased significantly.As biological yield and the feed quality being considered,SY7 and ND108 should be harvested at 85~90 d,90~95 d,respectively.When two varieties of forage corn were compared,the whole biological yield of SY7 was more than that of ND108,the content of crude protein,crude fiber and total energy of SY7 was better than that of ND108.However,the content of crude fat was less than that of ND108.Considering all of these mentioned above,it was conclude that SY7 was better than ND108.