2HANSARD S L,CROWDER H,LYKE W A. The Biological Availability of Calcium in Feed for Cattle [J].Anim. Sci,1957(16):437-443.
3MARTZ F A,BELO A T,WEISS M F. Absorption of Calcium and Phosphorus from Alfalfa and Corn Silage When Fed toLactating Cows[J]. Dairy Sci,1990(73):1288-1295.
6HANSARD S L,COMAR C L,DAVIS G.K. Effect of Age Upon the Physiological Behavior of Calcium in Cattle [J]. AnimSci, 1954 (25):1097-1102.
7WARD G R,DOBSON C,DUNHAM J R. Influence of Calcium and Phosphorus Intakes, Vitamin D Supplement, and Lactation on Calcium and Phosphorus Balance[J]. Dairy Sci,1972(55):768-776.
8BRAITHWAITE G D. Phosphorus Requirements of Ewe in Pregnancy and Lactation[J]. Ag. Sci. 1986 (106):287-292
9HIBBS J W,CONRAD H R. The relationship of Calcium and Phosphorus Intake and Digestion and the Effect of Vitamin D Feeding on Utilization of Calcium and Phosphorus by Lactating Cows [J]. Ohio Agric. Res. Dev. Center Res. Bull,1983(150): 1-26.
10VAN'T KLOOSTER A T. Adaptation of Calcium Absorption from the Small Intestine of Dairy Cows to Changes in the Dietary Calcium Intake and at the Onset of Lactation [J].Zeitschrift fur Tierphysiology, 1976 (37):169-182
9Burroughs W,Latone A,DePaul P.P mineral influences upon urea utilization and cellulose digestion by rumen microorganisms using the artificial rumen technique[J].J Anim Sci,1951(10):693-697.
10Breves G,Schroder B.Comparative aspects of gastrointestinal phosphorus metabolism[J].Nutr Res Rev,1991(4):125-140.