- Plasma 1,25-dihydroxyvitamin D, insulin-like growth factor-1, calcium, magnesium and phosphorus concentrations in pregnant beef cows and calves from a herd with a known history of congenital joint laxity and dwarfism. Hidiroglou, M., Ivan, M., Proulx, J.G., Davicco, M.J., Coxam, V., Barlet, J.P. Res. Vet. Sci. (1992)