关键词: 草原学, 雀稗草, 产草量, 营养价值

Abstract: Cut at a height between 50 cm and 60 cm,vasey grass(Paspalum urvillei) was measured for two successive years (April 2001-October 2002) for its yield of fresh grass, hay,dry matter (DM),crude protein,and digestible dry matter (DDM),as well as its nutritive composition at different growth stages.From July 5 to August 30,2002,feeding experiments were conducted to study beef cattle performance and dry matter digestibility with vasey as the basic diet along with 3 supplements: Lotononis fresh, cotton seed meal, and rice bran.Data show that vasey grass boasts relatively higher yield,richer nutrition composition and higher dry matter digestibility (DMD) than other grasses at its early growth stage,though it declines rapidly soon after its heading and blooming,losing its nutritive value all of a sudden. Interrelated analyses indicate that there is a positive relationship between its crude fiber content and growth days (P<0.05), and a negative relationship between its crude protein content and growth days (P<0.05).Vasey grass cut at a height of 60 cm contains more dry matter and digestible dry matter than that cut at 50 cm height. Beef cattle must feed on, besides vasey grass, supplements like concentrates (5 g/kg LW/d) or large amount of legumes.

Key words: Grassland science, Vasey grass (Paspalum urvillei), Grass yield, Nutritive value