Fig 9. Average of PTB plasma concentrations 1 h after more than 50% of the morning dose has been ingested.

Heifers were fed twice a day for 7 days. On Day 8, heifers no 4848 and 1567 received an additional dose one hour before sample collection. Plasma samples from heifer no 4849 and no 1550 was collected 15 h after the afternoon dose at Day 7.