Koppel is a 'flock' in poultry context, so flock 'passport' would work, or ‘flock passport’, using inverted commas first time to show it's not a proper passport.

http://ec.europa.eu/food/animal/diseases/eradication/reports...
An example of this is a ’passport’, a trade document that is provided by the supplier with the delivery of pullets and DOCs, stating adherence to at least compulsory testings under the National Control Programme, test results, and vaccinations. These passports are part of the industry code [in the UK].
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It is also very helpful to know in advance which vaccines have been given, so these should be detailed on the flock ‘passport’ which accompanies the birds and also noted on any sample submission forms supplied to testing laboratories.

http://www.prwatson.co.uk/aiproject/English/Compartmentalisa...
The maintenance of flock records/passports to allow traceability and establish levels of production and health
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Each flock should be individually identified and a "flock passport" kept that detail the health and production data for the flock e.g. vaccinations, feed type and intake, water consumption, mortalities etc.