ABSTRACT
Objective
Use of monensin during the stocker phase of production has been suggested as a possible
cause of reduced response to monensin during finishing. Experiments were conducted
to determine the carryover effects of monensin supplementation during the stocker
phase and effects of feeding monensin during the finishing phase on performance and
efficiency of beef steers.
Materials and Methods
Steers were fed hay or grazed cool-season annuals or bermudagrass in Arkansas before
finishing in Canyon, Texas (blocks 1 and 2) or Stillwater, Oklahoma (block 3). Treatments
were arranged as a 3 × 2 factorial with 3 monensin doses during the stocker phase
(0, 882, or 1,764 g/t offered in a free-choice mineral) and 2 levels during finishing
(0 or 37.5 mg/kg of diet DM). There were no block × treatment interactions (P ≥ 0.19) for performance or carcass measurements; therefore, data were pooled across
blocks and finishing locations.
Results and Discussion
Stocker × finishing treatment interactions were not observed for finishing performance
and efficiency data (P ≥ 0.50). There was no carryover effect on overall finishing performance or efficiency.
Cattle consuming monensin during the finishing phase had decreased (P < 0.01) DMI during finishing and increased (P < 0.01) G:F and (P = 0.03) fat thickness compared with those not fed monensin during the finishing phase.
Implications and Applications
Supplementation of monensin to stocker cattle before finishing did not affect subsequent
finishing efficiency response to monensin during finishing. Providing monensin in
finishing diets still decreases DMI and improves feed efficiency of finishing cattle.
Key words
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Article info
Publication history
Accepted:
July 1,
2020
Received:
May 8,
2020
Footnotes
The authors declare no conflicts of interest.
Identification
Copyright
© 2020 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
