Tables 1 and 2 show the actual diet DM formulation
and analyzed nutrient composition throughout the study.
These rations were formulated to meet or exceed NRC
requirements (NRC, 2000). Across all treatments, the diets
were formulated to be the same, except for monensin
and tylosin inclusion in the CONV diet and monensin,
tylosin, and ZH for the last 20 d of feed for CONV-Z.
Feed samples were collected for monensin and ZH
assays periodically throughout the study. No monensin
was detected in the NAT rations with a reported value