The effect of timing of oral meloxicam administration on physiological responses in calves after dehorning with local anesthesia

K-REx Repository

Show simple item record

dc.contributor.author Allen, Kellie
dc.date.accessioned 2013-04-24T14:52:08Z
dc.date.available 2013-04-24T14:52:08Z
dc.date.issued 2013-04-24
dc.identifier.uri http://hdl.handle.net/2097/15561
dc.description.abstract Dehorning is a painful husbandry procedure that is commonly performed in dairy calves. Parenteral meloxicam combined with local anesthesia mitigates the physiological and behavioral effects of dehorning in calves. The purpose of this study was to determine the influence of timing of oral meloxicam administration on physiological responses in calves after dehorning. Thirty Holstein bull calves 8- 10 weeks of age (28-70 kg) were randomly assigned to one of three treatment groups: placebo-treated control group (CONT) (n=10), calves receiving meloxicam administered orally (1 mg/kg) in powdered milk replacer 12 h prior to cautery dehorning (MEL-PRE) (n=10) and calves receiving meloxicam administered as an oral bolus (1 mg/kg) at the time of dehorning (MEL-POST) (n=10). Following cautery dehorning, blood samples were collected to measure cortisol, substance P (SP), haptoglobin, ex-vivo prostaglandin E2 (PgE2) production after lipopolysaccharide stimulation and meloxicam concentrations. Maximum ocular temperature (MOT) and mechanical nociceptive threshold (MNT) was also assessed. Data were analyzed using non-compartmental pharmacokinetic analysis and repeated measures ANOVA models. Mean peak meloxicam concentrations were 3.61 ± 0 .21 μg/mL and 3.27 ± 0.14 μg/mL with average elimination half-lives of 38.62 ± 5.87 h and 35.81 ± 6.26 h in the MEL-PRE and MEL-POST groups respectively. Serum cortisol concentrations were lower in meloxicam-treated calves compared with control calves at 4 h post-dehorning (P=0.0004). SP concentrations were significantly higher in control calves compared with meloxicam-treated calves at 120 h after dehorning (P=0.038). PgE2 concentrations were lower in meloxicam-treated calves compared with control calves (P=0.001). MNT was higher in control calves at 1 h after dehorning (P=0.02) but meloxicam-treated calves tended to have a higher MNT at 6 h after dehorning (P=0.07). There was no effect of timing of meloxicam administration on plasma cortisol concentrations (P= 0.69), SP concentrations (P=0.86), haptoglobin concentrations (P=0.86), MOT (P=0.90), or MNT (P=0.99). However, PgE2 concentrations in MEL-PRE calves were similar to CONT calves after 12h post-dehorning, while MEL-POST calves had lower PgE2 concentrations for 3 d post dehorning. These findings suggest that meloxicam reduced cortisol, SP and PgE2 after dehorning but only PgE2 production was significantly affected by the timing of meloxicam administration. en_US
dc.language.iso en_US en_US
dc.publisher Kansas State University en
dc.subject Welfare en_US
dc.subject Dehorning en_US
dc.subject Pain en_US
dc.subject Meloxicam en_US
dc.subject Analgesia en_US
dc.subject Timing en_US
dc.title The effect of timing of oral meloxicam administration on physiological responses in calves after dehorning with local anesthesia en_US
dc.type Thesis en_US
dc.description.degree Master of Science en_US
dc.description.level Masters en_US
dc.description.department Department of Clinical Sciences en_US
dc.description.advisor Hans Coetzee en_US
dc.subject.umi Veterinary Medicine (0778) en_US
dc.date.published 2013 en_US
dc.date.graduationmonth May en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search K-REx


Advanced Search

Browse

My Account

Statistics








Center for the

Advancement of Digital

Scholarship

118 Hale Library

Manhattan KS 66506


(785) 532-7444

cads@k-state.edu