Seasonal variation in nutritive value of twelve main forage plant species of grazed grassland in Shaertao mountain, Xinjiang

doi:10.11686/cyxb2018017

Abstract

Abstract: Twelve of the main forage plant species contributing to livestock diets in grazed grassland of Shaertao mountain in Zhaosu county, Xinjiang, were assessed for nutritive value and in vitro digestibility in order to define the seasonal variation in these traits for each forage. Large seasonal changes were observed for each forage species. Data for six indicators offorage quality (dry matter, crude protein, neutral detergent fiber, acid detergent fiber, ether extract, crude ash), together with rumen in vitro digestibility of organic matter and herbage metabolic energy were analyzed using a “Fuzzy similar priority ratio” method. The main conclusions were:1) For the three species Stipa capillata, Achnatherum splendens and Iris ruthenica, the best comprehensive nutritive value score occurred in the spring vegetative growth period (June), while the best season for utilization of the remaining 9 species was summer flowering period (July). 2) Dactylis glomerata had the best nutritional value in spring (June) and post-flowering (September), while Alchemilla sibirica had the best nutritional value at summer flowering (July). During autumn (August), Trifolium pratense with the highest comprehensive nutritional value score. 3) In the hay season (November), species with the best nutritional value were S. capillata and I. ruthenica. All species ceased growth in winter.

Key words: grassland, forage, nutritive value, digestibility, seasonal pasture

ZHANG Fan-fan, He Hai-xiu, YU Lei, YANG Kai-hu, LU Wei-hua, MA Chun-hui. Seasonal variation in nutritive value of twelve main forage plant species of grazed grassland in Shaertao mountain, Xinjiang[J]. Acta Prataculturae Sinica, 2018, 27(11): 179-191.

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