6Broderick G A. Performance of lactating dairy cows fed either alfalfa silage or alfalfa hay as the sole forage[J 1. Dairy Sci, 1995,78:320.
7Cadornig C P, L D Satter. Protein versus energy supplememation of high alfalfa silage diets for early lactation cows[J]. J Dairy Sci. 1993, 76 : 1976.
8Christensen D A, M l Cochran. Alfalfa cubes for dairy cattle[M]. University of Saskatchewan Greenbrae Dairy Herd Report. Saskatoon. Canada, 1990.
9D B Vagnoni, G A Broderick. Effects of supplcmcnt of cngerg or ruminally undegrated protein to lactating cows fed alfalfa hay or silage[J]. J Dairy Sci. 1997. 80: 1703- 1712.
10K A Beauchemin, L M Rode, M V Elias, on. Chexving activities and milk production of dairy cows fed alfalfa as hay, silage or dried cubes of hay or silage[ J ]. J Dairy Sci. 1997,80 : 324 - 333.
