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EFFECT OFBORAX AND CYSTEAMINE COMPOUND AGENT ON FINISHING SHEEP GROWTH PERFORMANCE, NITROGEN RETENTION, SERUM BIOCHEMICAL INDICES AND PROTEIN TURN-OVER STUDIES ON THE FATE OF LABELLED NITROGEN APPLIED TO A LEYMUS CHINENSIS COMMUNITY OF TYPICAL STEPPE IN INNER MONGOLIA GRASSLAND Relationships between net primary production and nitrogen cycling in Chinese forest ecosystems