Effects of Planting Density and Additives on Fermentation Quality,Nutrients and in Vitro Digestibility of Four Varieties of Whole Corn Silage in Tongliao Area
This experiment was conducted to study the effects of varieties,planting density and additives on fermentation quality,nutrients and in vitro digestibility of whole corn silage in Tongliao area.The whole corn silage was prepared using whole corn cultivars of"Dakang 205","Gaoyou 958","Zhongyu 335"and"Zhongnong 787"as materials,two planting density of 6.75×104 and 8.25×104 plants/hm2 was set,and Len-tilactobacillus buchneri was added after corn harvest.After 200 days of fermentation at room temperature,the fermentation quality,conventional nutrients and in vitro digestibility were determined,and the correlation anal-ysis method was used to evaluate the silage quality.The results showed as follows:1)the pH of 4 varieties of whole corn silage was below 4.0;the acetic acid(AA)content of"Gaoyou 958"silage was significantly higher than that of"Dakang 205"silage(P＜0.05),and the ammonia nitrogen(NH3-N)content was signifi-cantly lower than that of the other varieties(P＜0.05).The fermentation quality of whole corn silage with 8.25×104 plants/hm2 planting density was better than that of whole corn silage with 6.75x104 plants/hm2 plant-ing density.The contents of lactic acid(LA)and AA in whole corn silage supplemented with Lentilactobacil-lus buchneri were higher than those without additive(P＞0.05).2)The contents of dry matter(except"Gaoy-ou 958")and starch of"Dakang 205"silage were higher than those of the other varieties(P＜0.05),the con-tents of neutral detergent fiber(NDF)and acid detergent fiber were the lowest,and significantly lower than those of"Zhongyu 335"silage(P＜0.05);the nutritional quality of"Gaoyou 958"silage was inferior to that of"Dakang 205"silage.The nutritional quality of whole corn silage with 8.25×104 plants/hm2 planting densi-ty was better than that of whole corn silage with 6.75×104 plants/hm2 planting density.The nutritional quality of silage was improved after Lentilactobacillus buchneri was added.3)The in vitro dry matter digestibility(IVDMD)of"Gaoyou 958"silage was the highest,which was significantly higher than that of"Dakang 205"and"Zhongyu 335"silages(P＜0.05).4)The contents of NDF and ADF of whole corn silage were sig-nificantly positively correlated with contents of LA and AA(P＜0.05),the NH3-N content was significantly negatively correlated with pH and IVDMD(P＜0.05).In conclusion,the silage quality of"Dakang 205"and"Gaoyou 958"varieties is better,and the whole corn silage with high planting density of 8.25×104 plants/hm2 has higher nutrient contents,and the fermentation quality of whole corn silage can be improved by adding Len-tilactobacillus buchneri.The comprehensive evaluation shows that"Gaoyou 958"is suitable to be used as si-lage corn in Tongliao area.[Chinese Journal of Animal Nutrition,2024,36(3):1977-1986]
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