Lambooij E, Langeveld N G, Lammers G H, Huiskes J H
DLO-Institute for Animal Science and Health, branche Zeist, The Netherlands.
Vet Q. 1995 Dec;17(4):118-23. doi: 10.1080/01652176.1995.9694549.
A nationwide electronic system for the identification of all pigs is a means to achieve a tighter control of livestock and meat in the Netherlands. In order to examine the use of electronic identification transponders, two field trails were performed. Transponders supplied by three separate companies were tested on pigs on commercial farms. In phase 1, each device was examined on separate farms and in phase 2, the three devices were tested on each farm. A total of 3,436 and 5,947 transponders from the different suppliers were injected in the base of the ear at weaning in phase 1 and 2 on seven and five farms, respectively. The following aspects were examined: technical labour for injection and reading, readability of the transponders, impact on tissues at the injection site, and retrieval of the transponder after slaughter. After instruction the farmer was well able to inject a transponder in a restrained piglet. The results show that in phases 1 and 2 1.6% to 7.3% of the transponders were unreadable at retrieval in the slaughter line, which is significantly (p < 0.05) higher than the required maximum loss of 1%. The 1.6% failure rate in phase 1 involved transponders from a single supplier. Loss of identification was associated with rejection after injection, expulsion during inflammation and technical failure. Three weeks after injection on average 0.6% of the piglets had an observable inflammation and at the time of retrieval pus was found around, on average, 1.2% of the transponders. An average of between 37% and 88% of the transponders were retrieved in the slaughter line from the base of the ear in phases 1 and 2. The other transponders were retrieved medial or caudal to this position. This positional variation meant that it was not consistently possible to remove the transponder from the carcass within the required 4 second time period. It was concluded that the systems should be improved before recommending their introduction on a large scale, because the variation in readability and location is too high.
荷兰全国性的所有猪只识别电子系统是实现对牲畜和肉类更严格管控的一种手段。为了检验电子识别应答器的使用情况，进行了两项实地试验。对来自三家不同公司的应答器在商业农场的猪只上进行了测试。在第一阶段，每个设备在不同农场进行检验，在第二阶段，三个设备在每个农场进行测试。在第一阶段和第二阶段，分别在七个和五个农场，将来自不同供应商的总共3436个和5947个应答器在断奶时注射到猪耳基部。检查了以下方面：注射和读取的技术操作、应答器的可读性、注射部位对组织的影响以及屠宰后应答器的回收情况。经过培训，农民能够很好地在被约束的仔猪身上注射应答器。结果表明，在第一阶段和第二阶段，屠宰线上回收时1.6%至7.3%的应答器不可读，这显著高于（p<0.05）要求的最大损失率1%。第一阶段1.
