Comparative Analysis of Yield and Nutritional Value of Six Perennial Grasses in Alpine Area of Qinghai
[Objective]The aim of this experiment was to evaluate the nutritional value of artificially cultivated grass perennial forages in alpine region of Qinghai,in order to provide reference for the development of high-altitude animal husbandry and the demand for livestock feed.[Method]The experiment focused on common cold regions such as Agropyron cristatum,Lolium perenne L.,Triticale,Elymus tangutorum,Poa crymophila and Poa pratensis L.as research objects,and three adult male yaks were selected as rumen fluid donor animals,while the nutritional value of the pasture grasses was evaluated by in vitro gas production method combined with the pasture grass production.[Result]① The fresh grass yield and dry grass yield of Triticale were significantly higher than those of other grasses(P＜0.05).The dry to fresh ratio of Triticale and Elymus tangutorum was low,which was significantly lower than that of other grasses(P＜0.05).② The dry matter(DM)and crude protein(CP)contents of Triticale were significantly higher than those of Poa crymophila and Poa pratensis L.(P＜0.05).The content of crude ash(Ash),neutral detergent fiber(NDF)and acid detergent fiber(ADF)was the highest in Poa pratensis L..The ether extract(EE)content of Agropyron cristatum was significantly higher than that of other grasses(P＜0.05).The calcium(Ca)content of Triticale was significantly higher than that of other grasses(P＜0.05),while the phosphorus(P)content was the same as that of Agropyron cristatum.③ The in vitro gas production(GP)of Triticale at 24,48 and 72 h was significantly higher than that of other grasses(P＜0.05),and the gas production among six cultivated forages showed an increasing trend over time.(4)The pH range of in vitro fermentation broth of six cultivated forages was 6.76 to 6.98.There were significant differences in the total volatile fatty acid,acetic acid and propionic acid content between Triticale and Elymus tangutorum compared with other grasses(P＜0.05).Triticale had the highest content of butyric acid and valeric acid.The ratio to acetate to propionate of Poa pratensis L.were significantly higher than that of other grasses(P＜0.05).The concentration range of ammonia nitrogen(NH3-N)of six cultivated forages was 84.70-112.60 mg/L.The in vitro dry matter digestibility(IVDMD)of Poa crymophila was significantly higher than that of other grasses(P＜0.05).(5)The yield of nutrients per unit area of Triticale was the highest,which was significantly higher than that of other grasses(P＜0.05).[Conclusion]In summary,Triticale had the best production performance and high nutritional value,and could be used as a suitable pasture for cultivation in alpine region of Qinghai.
alpine regionexternal gas productionperennial grassgrass productionnutritional value
万方数据
维普
