^(13)C analysis of cow tail hair and farm slurry can be used to implicitly distinguish between different dairy production systems  

作　　者：Friederike Sieve Johannes Isselstein Manfred Kayser 

机构地区：[1]Department of Crop Science,Grassland Science,Georg-August University Göttingen,Von-Siebold-Str.8,37075 Göttingen,Germany [2]Geo-Lab,University of Vechta,Driverstraße 22,49377 Vechta,Germany

出　　处：《Ecological Processes》2023年第1期98-109,共12页生态过程（英文）

基　　金：supported by the Federal Office for Agriculture and Food(BLE)within the collaborative research project‘Waterbuddies’,support code:2817NA004;We acknowledge funding by the Open Access Publication Funds of the Göttingen University;Open Access funding enabled and organized by Projekt DEAL.

摘　　要：Background Public interest in the way food is produced on the farm and processed along the food-production chain is increasing.The analysis of isotopic signatures(^(13)C)in cow tail hair provides a method to reconstruct the dietary proportion of maize in cow diets.Based on this,we further investigated whether there is a relationship between isotopic signatures in cow tail hair or farm slurry and the proportion of maize of the total utilized agricultural area per farm[%].We did an on-farm survey on 17 dairy farms in coastal Northwest Germany and collected cow tail hair from dairy cows and slurry samples on each farm.The farms differed in their feeding regime(C_(3) vs.C_(4) plants),their site conditions(sandy soil=‘Geestland’;organic soil=‘Peatland’;clayey soil=‘Marshland’),and in the area cultivated with maize as a proportion of the total utilized agricultural area per farm.Results We found a positive relationship between δ^(13)C values in both cow tail hair and slurry and the annual dietary proportion of maize(R^(2)=0.67;and R^(2)=0.63).Furthermore,we confirmed that there was a relationship betweenδ^(13)C values in cow tail hair and area of maize as a proportion of the total utilized agricultural area per farm(R^(2)=0.69).Conclusion Our findings suggest a general applicability of using isotopic signatures(^(13)C)along a wide gradient of site conditions and productions systems in practice.

关 键 词：Stable isotopes Natural^(13)C abundance Environmental indicator Maize Dietary composition Traceability 

分 类 号：TS252.7[轻工技术与工程—农产品加工及贮藏工程]