In vitro evaluation of feeding value of mixed silage of defective pears and Atriplex canescens
The experiment used the in vitro gas production method to study the feeding value of mixed silage with defective pears and Atriplex canescens,selecting 5 healthy Karakul sheep with similar body conditions as the rumen fluid donors.A single-factor random design was adopted,with a total of five treatment groups,each with five replicates.The proportions of Atriplex canescens to defective pears were added as 10:0(control,CON group),8∶2(20 LW group),7∶3(30 LW group),6∶4(40 LW group),and 5∶5(50 LW group),and then mixed with 1 × 106 CFU/g of lactic acid bacteria for silage.After ensiling for 90 days,the nutritional components,fermentation quality,gas production parameters,and ruminal degradability of the main nutrients were measured.The results showed that compared to the control group,the neutral detergent fiber(NDF)and acid detergent fiber(ADF)content in the silage of all mixed experimental groups were significantly reduced(P＜0.05),while the content of water-soluble compounds(WSC)was significantly increased(P＜0.05).Compared to the control group,the contentrations of lactic acid(LA),acetic acid(AA)and the concentration of ammonia nitrogen(NH3-N)in the silage of the mixed experimental groups were significantly increased(P＜0.05),while the concentrations of propionic acid(PA)and butyric acid(BA)and the pH value were significantly decreased(P＜0.05).The gas production rate of the 40 LW group and 50 LW group were significantly higher than the other three groups(P＜0.05).Compared to the control group,the ruminal degradability of dry matter(DM),NDF,and ADF in all mixed experimental groups was significantly increased(P＜0.05).The study indicates that the mixed silage of defective pears and Atriplex canescens can promote rumen fermentation in vitro,and the proportions of Atriplex canescens to defective pears is 7∶3 and 6∶4.
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