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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0237    [Accepted] Published online August 3, 2019.
Reducing lesion incidence in pork carcasses by heating foot-and-mouth disease vaccine before injection
Jaesung Cho1  , Eun Young Ko2  , Kyung Jo1  , Seonmin Lee1  , Sungbong Jang1  , Minho Song1  , Samooel Jung1,* 
1Division of Animal and Dairy Science, Chungnam National University, Daejeon 34134, Korea
2Dodram Pig Farmers’ Cooperative, Icheon 17405, Korea
Correspondence:  Samooel Jung, Tel: +82-42-821-5774, Fax: +82-42-825-9754, Email: samooel@cnu.ac.kr
Received: 21 March 2019   • Revised: 30 May 2019   • Accepted: 20 June 2019
Abstract
Objective
This study was conducted to investigate the effects of heating the foot-and-mouth disease (FMD) vaccine before injection on the incidence of lesions at the injection site (pork butt), amount of discarded meat, and farm economics.
Methods
A total of 101,086 piglets raised on 30 farms were vaccinated in the neck with 2 mL of FMD vaccine at 56 d and 84 d of age using a commercial syringe. The heat treatment group (48,511 pigs) was injected with the FMD vaccine after it had been heated in a water bath at 40°C for 20 min. After slaughter, the incidence of lesions on the pork butt was assessed, and the amount of discarded meat was recorded.
Results
Heat treatment of the FMD vaccine reduced the lesion incidence rate on the pork butt (p < 0.01). Overall, 17.81% of the pigs in the heat treatment group had lesions, while the incidence rate in the control group was 21.70%. The amount of discarded meat per head for both total pigs and pigs with lesions was significantly lower in the heat treatment group than in the control group (p < 0.01). Thus, the proportion of discarded meat to dressed carcass was lower in the heat treatment group (0.249%) than in the control group (0.338%) (p < 0.01). Farms that rear 1,000 sows could gain 1,863,289 KRW ($1,600 USD) of economic benefit per year by adopting heat treatment of the FMD vaccine before injection.
Conclusion
Heat treatment of FMD vaccine using a simple heating equipment (water bath) can be effective in reducing lesions caused by FMD vaccination, which can lead to economic benefits across pig farms.
Keywords: Foot-and Mouth Disease Vaccine; Pork; Lesion; Heat Treatment
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