ABSTRACT
Objective
The objective of this study was to evaluate the effects of monensin and concentrate
supplementation levels on bermudagrass (Cynodon dactylon) in situ disappearance and ruminal measurements.
Materials and Methods
The experiment was conducted in Ona, Florida, and treatments were the factorial arrangement
of 2 supplementation levels [0.4 (low) or 4 kg/d (high)] and 2 monensin levels (0
or 20 mg/kg of the DMI) distributed in a Latin square design. The supplement was 17.1%
CP and 79.1% TDN.
Results and Discussion
Steers receiving the higher supplementation level had greater (P = 0.01) total DMI (1.4 vs. 1.0 ± 0.1% BW), but there was no difference in forage
DMI (P = 0.72, mean = 1.0 ± 0.1% BW). Monensin did not affect total DMI or forage DMI (P ≤ 0.74). There was a monensin × supplementation level interaction on ruminal propionate
concentration. The interaction occurred because there was no effect (P = 0.64) of monensin with low supplementation (mean = 12 ± 1.2 mol/100 mol); however,
monensin increased (P = 0.01) propionate on the high supplementation level (19 vs. 15 ± 1.5 mol/100 mol).
There was no effect (P > 0.05) of monensin on potential DM, CP, and NDF disappearance; however, greater
supplementation level increased (P < 0.03) potential DM and NDF disappearance.
Implications and Applications
Monensin did not change forage disappearance measurements but increased ruminal propionate
concentrations in steers receiving higher supplementation level. Higher supplementation
level was effective to increase total DMI and forage DM and NDF disappearance.
Key words
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Article info
Publication history
Accepted:
December 17,
2021
Received:
October 29,
2021
Footnotes
The authors have not declared any conflicts of interest.
Identification
Copyright
© 2022 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
