The American Veterinary Medical Association has stated the importance of minimizing pain associated with dehorning to limit the amount of distress and changes in the animals behavior and physiological states (AVMA, 2014b). The following studies aim to determine the effect of timing of lidocaine administration on physiological responses in calves after dehorning. The first study compared cortisol and substance P levels in calves dehorned immediately after administration of lidocaine and meloxicam, calves dehorned 10 minutes after the administration of lidocaine and meloxicam, and calves that were administered lidocaine and meloxicam and not dehorned. It was concluded waiting 10 minutes after administration of lidocaine and meloxicam to dehorn calves provided no benefits, as it did not reduce plasma cortisol and substance P compared to other treatment groups. The second follow up study compared cortisol and adrenocorticotropic hormone (ACTH) levels in calves dehorned immediately compared to calves dehorned 10 minutes after the administration of lidocaine alone, calves dehorned without lidocaine, and calves administered lidocaine but not dehorned. Waiting 10 minutes to dehorn calves after lidocaine administration may provide some benefits in reducing plasma ACTH and cortisol. Calves dehorned after a 10-minute waiting period had lower peak plasma ACTH levels and reached pretreatment levels for both plasma ACTH and cortisol quicker than the other treatment groups that were dehorned. However, differences observed in ACTH dissipate in 5 minutes and all calves reached baseline plasma cortisol levels within an hour of dehorning.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-03312017-162022 |
| Date | 12 April 2017 |
| Creators | Mathias, Amanda Jane |
| Contributors | Williams, Cathleen, Thompson, Don, Navarre, Christine, Welborn, Matt |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-03312017-162022/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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