6Stoskus A. Sowing rates and methods for lucemecv [M]. Birtute. Zemdirbyste Mokslo Darbai, 1996 (66) : 133 - 144.
7NRC. Nutrient Requirements of Swine [S]. 10th Ed. Washington D C. :National Academy Press, 1998.
8AOAC. Offieal Methods of Analysis ( Vol. 1)[S]. 15th Ed. Washington D C. :AO AC,1990:69-90.
9Pollman D S, Daniels on D M , Crenshaw M A, et al. Long -term effects on dietary additions of alfalfa and tallow on sow reproductive performance [J]. Anim. Sci. , 1980 (51 ) :294 - 299.
10Vestergaard E M, Danielsen V. Dietary fiber for sows : effects of large amounts of soluble and insol- uble fibers in the pregnancy period on the perform-ance of sows during three cycles [J]. Anim. Sci. , 1998 (68) :355 - 362.