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Shao HT, Gao L, Li HT, Zhang M, Chen JC, Duan MH, Li ZE, Dai Y, Li XP, Yang F. Egg residue and depletion of meloxicam in Jing Hong laying hens following multiple oral doses. Poult Sci 2023; 102:102761. [PMID: 37270891 PMCID: PMC10258491 DOI: 10.1016/j.psj.2023.102761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 04/21/2023] [Accepted: 04/25/2023] [Indexed: 06/06/2023] Open
Abstract
Meloxicam is a nonsteroidal anti-inflammatory drug (NSAID) commonly used in an extra-label manner in commercial laying hens for the treatment of foot lesions, which are a common issue in this species. The present study aimed to determine the depletion profiles of meloxicam in eggs with multiple oral administration under 2 different dosing regimens and to further recommend reasonable withdrawal intervals (WDIs). Meloxicam (1 mg/kg) was administered orally to laying hens under 2 dosing schedules: 10 doses at 24-h intervals and 15 doses at 12-h intervals. Eggs were collected daily after the first dosing, and meloxicam concentrations in both yolk and white were determined by a high-performance liquid chromatography (HPLC) method. The weight ratio of white to yolk in the whole egg was 1.54 (the mean of 20 eggs with repeated tests), and this value combined with the meloxicam concentrations in white and yolk were used to calculate the drug concentrations in whole eggs. Meloxicam was quickly eliminated from egg white, and its concentrations could only be quantified at 2 time points during the elimination phase. The elimination half-lives in yolk and whole egg were 3.07 ± 1.00 and 2.98 ± 0.88 d, respectively, after 10 repeated doses. And the corresponding elimination half-lives were 2.30 ± 0.83 and 2.18 ± 0.67 d, respectively, after repeated 15 doses. Considering the time when meloxicam was not detectable in eggs with the time of ovum development and maturation, a withdrawal interval (WDI) was suggested as 17 d for both dosing schedules. The current results enriched the study on the residue of meloxicam in domestic Jing Hong laying hens and provided WDIs to help ensure animal-derived food safety.
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Affiliation(s)
- Hao-Tian Shao
- Department of Basic Veterinary Science, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471023, China
| | - Liang Gao
- College of Animal Science, Yili Vocational and Technical College, Yili 835000, Xinjiang, China
| | - Hao-Tian Li
- Department of Basic Veterinary Science, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471023, China
| | - Mei Zhang
- Department of Basic Veterinary Science, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471023, China
| | - Jun-Cheng Chen
- Department of Basic Veterinary Science, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471023, China
| | - Ming-Hui Duan
- Department of Basic Veterinary Science, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471023, China
| | - Ze-En Li
- Department of Basic Veterinary Science, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471023, China
| | - Yan Dai
- Department of Basic Veterinary Science, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471023, China
| | - Xing-Ping Li
- Department of Basic Veterinary Science, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471023, China
| | - Fan Yang
- Department of Basic Veterinary Science, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471023, China.
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Shao HT, Yang F, Chen JC, Zhang M, Song ZW, Yang F. Pharmacokinetics of meloxicam in laying hens after single intravenous, oral, and intramuscular administration. J Vet Pharmacol Ther 2022; 45:488-494. [PMID: 35717631 DOI: 10.1111/jvp.13081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 06/06/2022] [Accepted: 06/08/2022] [Indexed: 02/06/2023]
Abstract
The objective of this study was to determine the pharmacokinetics of meloxicam after a single intravenous (IV), intramuscular (IM), and oral (PO) dose at 1 mg/kg body weight in Jing Hong laying hens. Blood samples were collected at predetermined time points. Plasma meloxicam concentrations were determined using a validated high-performance liquid chromatography (HPLC) assay method and then subjected to a non-compartmental analysis. After IV administration, meloxicam had a mean (±SD) volume of distribution at steady-state (Vdss ) of 206.50 ± 25.23 ml/kg, a terminal half-life (t1/2λ ) of 5.45 ± 0.53 h, and a total body clearance (Cl) of 26.48 ± 4.13 ml/h/kg. After PO and IM administration, meloxicam was absorbed relatively rapidly: the peak concentrations (Cmax s) of 3.04 ± 0.56 and 8.94 ± 2.31 μg/ml were observed at 3.08 and 0.80 h, respectively. After PO and IM administration, the absolute bioavailability (F) was determined as 70.13% and 125.50%, respectively. Assuming that hens shared the same analgesic threshold of meloxicam (0.5 μg/ml) with humans, the plasma concentrations after three different routes (PO, IM, and IV) of administration were above this value for 16.7, 19.2, and 14.9 h, respectively.
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Affiliation(s)
- Hao-Tian Shao
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - Fang Yang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - Jun-Cheng Chen
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - Mei Zhang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - Zhe-Wen Song
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - Fan Yang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
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