|其他摘要||Xinjiang Province as a big province of animal husbandry in China, the develop-ment of stockbreeding needs a lot of forage, but due to soil salinization, the area of grassland is reduced gradually, as a result, the conflict between forage and livestock have become increasingly prominent. The germplasm resources of Xinjiang’s halo-phytic plants are very rich, with more than 300 kinds have been identified. Those plants can normally grow and reproduce on saline-alkali soil, some of them are also wild animals’ feedstock source, develop those plants into forge will not only benefit for local stockbreeding, but also lead to the development and utilization of large areas of saline alkali land and brackish water, the ecological effect is biological improvement of saline alkali land.
The study aimed to study the suitable harvest time and evaluate the feeding value of five cultivated Chenopod annual halophytic forage grasses (Chenopodium rubrum; Atriplex aucheri; Suaeda salsa; Salicornia europaea; Suaeda altissima) which sampled from Xinjiang saline-alkali soil. Plants samples were analyzed for nutritional component contents, mineral elements, second compounds and heavy mental in three different growth periods: nutrient, bloom and fruit period in July to September of 2015. The mixed silage modulation technology of the five species of halophytic forage was explored based on their nutritive value.
The results showed that the five kinds of halophytes’ yield increased continu-ously with the advance of the growth period, water contents dropped gradually, crude protein contents increased before bloom and then drop, nitrogen free extract contents dropped gradually, crude ash decreased slightly, crude fiber contents rose continuous-ly, oxalates contents were lowest in early bloom period. In conclusion, those plants should be exploited and utilized in early flowering stage.
Compared with alfalfa in blooming period, C. rubrum high in crude protein and nitrogen free extract, ranks the highest in nutritive value accordingly, A. aucheri have higher crude fiber contents and lower feeding value than C. rubrum, S. salsa and S. europaea could be nutritional for a long period and low in crude fiber contents. But high in soluble mineral contents which decreased its forage quality, the main factors that limit S. altissima’ feeding value are its lignin stem, high stem-leaf ratio and hard to digestive, thus its feeding value was the lowest. Considering about their secondary compounds which have a positive or negative effects on fodder’ feeding value, C. rubrum, A. aucheri and S. altissima were rich in betaines, at about 7%. The oxalate contents of S. europaea, C. rubrum and A. aucheri exceeded safety concentration.
The main factor that limit halophytes for forage utilization is the high salt content, oxalate contents also exceeded the toxic level, therefore, they are not suitable be a single feedstock resource for a long-period, need to be mixed with other fodders. The best way to improve halophytes’ palatability and digestibility is ensiling halophytic plants with other feed ingredients (corn, sorghum) by which can effectively conserve halophytic plants’ nutritive components(vitamins, glycine betaine) and improve their feeding value.|