6Block E. Manipulating dietary anions and cations for prepartum dairy cows to reduce incidence of milk fever . J Dairy Sic, 1984, 67: 2 939
7Bronner, F. Calcium absorption -A paradigm for mineral absorption . J. Nutr. 1998,28:917
8Care, D. F. Wooding B. P etal. Calcium transport and the lactation of calbindin-D9k in the ruminant placenta during the second half of pregnancy . J Cell and Tissue Research, 1996,8:477-489
9Curtis C R, Erb H N, Sniffen C J, et al. Path analysis of dry period nutrition, postpartum metabolic and reproductive disorders, and mastitis in Holstein cows . J Dairy Sci, 1985, 68:2 347-2 360
10Ender F, Dishington I W, Helgebostad A. Calcium balance studies in dairy cows under experimental induction and prevention of hypocalcaemia paresis puerperalis. The solution of the etiology and the prevention of milk fever by dietary means. Zentralbl Tierphysiol Tierernrg Futtermittelkde, 1971,28:233-256