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• W2125655344 abstract "Societal interest in food safety, animal welfare, and environmental quality attributes of food production is increasing, creating a need for reliable indicators of such factors. Here we test the hypothesis that cattle farming systems create unique and meaningful isotopic fingerprints, which can be characterized by analysing cattle tail switch hair. To this end we analysed feeding practices and nutrient fluxes, and sampled hair, feed components and fertilizers from 13 different farms in Upper Bavaria, Germany. The farms represented the range of cattle farming types present in the region and included: conventional confinement dairy, pasture based organic and conventional dairy, suckler cow, and bull and steer and heifer fattening enterprises. Samples were analysed for their carbon (C) and nitrogen (N) stable isotope composition (δ13C and δ15N). Feed samples could be assigned to one of three groups with characteristic δ13C, which varied very little between and within farms: C3 forages (including fresh forage, hay or silage from grassland and clover-grass mixtures) with −28.4‰ (±0.5‰ S.D.), maize (Zea mays L.) with −12.5‰ (±0.4‰), and C3-derived concentrates (including mainly cereal grain and legume seeds) with −26.8 (±1.1‰). The dry matter fraction of maize in the diet explained 96% of the farm average δ13C of hair. Hair was approx. 2.7‰ enriched in 13C relative to the diet (trophic level shift), and this effect was very similar for growing animals and cows, and seemingly independent of the fraction of maize in the diet. In contrast to δ13C, the δ15N of individual feed types differed very strongly between – and also within – farms. Only legume seeds had relatively constant δ15N (1.2 ± 0.5‰). δ15N of cow hair was correlated with stocking rate (r2 = 0.55) and N input surplus (farm gate) (r2 = 0.78), respectively. This correlation was probably caused by increasing losses of 15N-depleted N via ammonia volatilisation, nitrate leaching and denitrification with increasing farm-level N surplus. Heterogeneity of feed 15N signatures indicated within-farm heterogeneity of N fluxes and cycling that was at (least partially) integrated in cattle hair. Thus, cattle hair 15N signature appears to indicate the ‘leakiness’ of cattle production systems for N. Conversely, the 13C signatures reliably indicates maize feeding and, thus, the type of land use (arable forage cropping versus grassland farming) on which cattle production in the region is based." @default.
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• W2125655344 date "2005-08-01" @default.
• W2125655344 modified "2023-10-07" @default.
• W2125655344 title "Carbon and nitrogen stable isotope composition of cattle hair: ecological fingerprints of production systems?" @default.
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• W2125655344 doi "https://doi.org/10.1016/j.agee.2005.01.015" @default.
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