Table 7.  Relative bioavailability of trace minerals from different sources (adapted from Greene et al., 1998)

   Mineral     Sulfate            Oxide                Carbonate                  Chloride              Organic

Co                         100                      31a                             110a                               -                       85g

Cu                         100                        0b                              -                                  105c                  130h

Fe                          100                        0d                              0-75d                            -                         -

Mn                        100                      58e                             28e                                 -                      176i

Zn                         100                         -                               60f                               40f                    159j-206k

aHenry (1995)

bKegley and Spears (1994)

cIvan et al. (1990)

dSpears (1996)

eWong-Valle et al. (1989)

fKincaid (1979)

gKawashima et al. (1986)

hKincaid et al. (1986)

iFly et al. (1989)

jPower et al. (1994)

kWedekind et al. (1992