Figure 1.

Effect of sampling day and sampling time on plasma Met concentration in lactating dairy cows fed a diet with increasing amounts of supplemental Met provided by abomasal infusion of dl-Met or by feeding Smartamine M (SM). Panel A shows the plasma Met concentration for the control treatment (black line), 12 g/d of infused dl-Met (dark blue line), and 24 g/d of infused dl-Met (red line). Panel B shows the plasma Met concentration for the control treatment (black line), 15 g/d of fed Met (20 g/d of SM; light blue line), and 30 g/d of fed Met (40 g/d of SM; purple line). The vertical lines indicate when cows were fed. Error bars indicate SE.