Figure 1.

Effect of the form of Se on the systemic concentration of P4 during gestation. Cows had ad libitum access to vitamin-mineral premixes containing 35 ppm of either inorganic (ISe; sodium selenite; n = 12), or a 1:1 combination (MIX) of ISe and OSe (SEL-PLEX; n = 14) selenium. The concentrations of P4 was affected by treatment (p = 0.02) and time (p < 0.001) but not treatment by time (p = 0.2). * The concentration of P4 was elevated in MIX-supplemented cows at months 1, 3, 5 and 7 of gestation (p < 0.05).