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Grup de Recerca en Remugants, Departament de Ciencia Animal i dels Aliments, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
3 Correspondence—phone and fax: +34 93 5811442; e-mail: gerardo.caja{at}uab.es.
A cost model was developed to compare different implementation strategies of the new European Commission regulation for sheep and goat identification and registration (EC 21/2004) in Spain. Strategies were as follows: 1) conventional identification (CID) by two ear tags; 2) electronic identification (EID) by one bolus and one ear tag; and 3) mixed CID and EID strategy (MID), consisting of CID for fattening stock and EID for breeding stock. Complete and simplified implementations of the regulation were considered as options. Total costs per animal identified for all strategies and options varied according to the implementation option, ranging from 
2.48 and 4.64. The EID was the most expensive strategy (4.47 to 4.64) for all implementation options. Cost of CID and MID strategies ranged from 2.63 to 2.98 and from 2.48 to 3.03, respectively. The model was submitted to a sensitivity analysis without considering extra benefits of sheep and goat identification. Critical values for which the cost of MID equaled CID depended on strategy and option, and ranged from 7.5 to 11.5% for ear tag losses and from 1.80 to 3.30 for bolus price. In conclusion, the use of a mixed strategy combining conventional ear tags (animals intended for slaughter) and electronic boluses (breeding stock) seems to be an affordable strategy that fulfills the European Commission regulation requirements for the identification of sheep and goats in Spain. Price reductions for devices and equipment would make the full electronic identification strategy less expensive in the future.
Key Words: Animal Identification • Bolus • Cost Analysis • Ear Tag • Electronic Identification
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