Benefit Analysis Of Cattle Raizing On Silage With Rest Rotation Grazing Integrated System At Sand Dune Steppe

摘要

Based on constructing plant windbreak and sand fixation forests, tongliao sand dune area has been improved by growing corn silage plantation and fency pasture near settled points, when total steppe area was reduced in 38% in 2001 in comparison with that in 1992. Under 400 thousand hectares of nature grassland, 260 thousand tons of hays were cropped, from 35 thousand hectares of improved pastures 150 thousand tons of hays were obtained. 312 thousands cattle units have been kept in this area, 1566kg hays were estimated for wintering to each cattle unit. For dual simmeantal crossed, 6500 cows were supplied by the corn silage, (at 22.5 tons per hectare), each cow produce 3120 kg milk a lactation, there were 2.7 times as much as milk produced than that under natural sand dune steppe. Plan for steppe improvement and windbreak with sand fixation has been started in 1982, under this situation animal productively was possible to increase. But the cattle sheep raio was changed from 0.76:1 (cattle to sheep) in 1992 to 2.28:1 in 2001. that showed the increase of cattle number in 18.9% and decrease of sheep number in 60.4% is feasible, cut down the number of low grass eating animals is useful for sand fixation. As the result shown for further development grassland improving measures must be increasingly emphasized.