2Heck J M L,van Valenberg H J F,Dijkstra J,et al.Seasonal variation in the Dutch bovine raw milk composition[J].Journal of Dairy Science,2009,92:4 745-4 755.
3Jenkins T C,McGuire M A.Major advances in nutrition:impact on milk composition[J].Journal of Dairy Science,2006,89:1 302-1 310.
4Musgrave S D,Salisbury G W.The Relationship of milk energy and total protein to per cent fat in brown Swiss herd milk[J].Journal of Dairy Science,1952,35:174-178.
7NRC.Nutrient Requirement of Dairy Cattle[S].7th ed.Washington,D.C.:National Academy Press,2001.
8Friggens N C,Ridder C,Lφvendahl P.On the use of milk composition measures to predict the energy balance of dairy cows[J].Journal of Dairy Science,2007,90(12):5 453-5 467.
