豆科牧草-全株玉米混贮比例对青贮饲用价值的影响OA北大核心CSTPCD

The purpose of this study was to explore the effects of different mixing ratios of legume forage and whole plant maize on the improvement of mixed silage feeding value.In this study,two legume grasses('Fendoumulv 2'and Dolichos lablab)were used as the main factors,and the mixing ratio of legume forage and whole plant maize as control group(90％whole plant maize+10％legume forage;80％whole plant maize+20％leguminous forage;70％whole plant maize+30％leguminous forage;100％legume grass)as a secondary factor,100％whole plant maize silage(CK),with a total of 9 mixed storage treatments and 3 replicates The nutritional quality,fermentation quality,rumen fermentation parameters,in vitro dry matter degradation rate and gas production of mixed silage were determined after fermentation.The results showed that:1)In terms of nutritional quality,the dry matter of 100％'Fendoumulv 2'silage was the lowest in all treatments,and the contents of acid detergent fiber,neutral detergent fiber and crude protein were the highest in all treatments.The crude fat of Dolichos lablab silage was significantly higher than that of'Fendoumulv 2'(P＜0.05).The NDF,ADF and CP of 100％whole plant maize silage were the lowest in all treatments and its EE was the highest in all treatments.2)In terms of fermentation quality,the pH and ammonia nitrogen of 100％'Fendoumulv 2'silage were significantly higher than those of other treatments(P＜0.05).The acetic acid of 100％Dolichos lablab silage was the lowest in all treatments.The pH and AN of 100％whole plant maize silage were significantly lower than those of other proportions(P＜0.05),and its AA was significantly higher than that of other treatments(P＜0.05).3)In terms of rumen fermentation parameters,the AN,AA,propionic acid and dry matter degradation rate in body in rumen fermentation of 90％whole plant maize+10％'Fendoumulv 2'were the highest in all treatments.The dry matter degradation rate of Dolichos lablab mixed silage was significantly higher than that of'Fendoumulv 2'.The pH of 100％leguminous forage mixed silage was the highest in all treatments in rumen fermentation(P＜0.05),and its acetic acid and dry matter the degradation rate in body were the lowest in all treatments.4)In terms of dry matter degradation rate and gas production of vitro,since 48 h,the dry matter degradation rate in vitro of 70％whole plant maize+30％'Fendoumulv 2'mixed silage has been higher than that of other treatments(P＜0.05).The gas production in vitro of'Fendoumulv 2'mixed silage was higher than that of Dolichos lablab mixed silage.Increasing the mixing ratio of leguminous forage can significantly reduce the gas production at 72 h(P＜0.05).In conclusion,compared with whole plant maize silage,a certain proportion of mixed silage is more beneficial to improve the nutritional quality of mixed silage,improve the fermentation quality of mixed silage,promote the digestion and absorption of mixed silage,and reduce the greenhouse effect of animal husbandry.The mixing model of 70％whole plant maize+30％'Fendoumulv 2'is recommended,which can provide data support for the next step to promote the mixing technology and belt rotation technology of plant maize-legume forage in the sickle curvature area in northwest of Shanxi Province.