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Evaluation of trace element status of organic dairy cattle

Published online by Cambridge University Press:  06 November 2017

I. Orjales ,
C. Herrero-Latorre ,
M. Miranda ,
F. Rey-Crespo ,
R. Rodríguez-Bermúdez  and
M. López-Alonso
I. Orjales*
Affiliation:
Departamento de Anatomía, Produción Animal e Ciencias Clínicas Veterinarias, Facultad de Veterinaria, Universidade de Santiago de Compostela, 27002 Lugo, Spain
C. Herrero-Latorre
Affiliation:
Departamento de Química Analítica, Nutrición e Bromatoloxía, Facultad de Ciencias, Universidade de Santiago de Compostela, 27002 Lugo, Spain
M. Miranda
Affiliation:
Departamento de Anatomía, Produción Animal e Ciencias Clínicas Veterinarias, Facultad de Veterinaria, Universidade de Santiago de Compostela, 27002 Lugo, Spain
F. Rey-Crespo
Affiliation:
Centro Tecnolóxico Agroalimentario de Lugo (CETAL), 27002 Lugo, Spain Departamento de Patoloxía Animal, Facultad de Veterinaria, Universidade de Santiago de Compostela, 27002 Lugo, Spain.
R. Rodríguez-Bermúdez
Affiliation:
Departamento de Patoloxía Animal, Facultad de Veterinaria, Universidade de Santiago de Compostela, 27002 Lugo, Spain.
M. López-Alonso
Affiliation:
Departamento de Patoloxía Animal, Facultad de Veterinaria, Universidade de Santiago de Compostela, 27002 Lugo, Spain.
*
†E-mail: [email protected].
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Abstract

The present study aimed to evaluate trace mineral status of organic dairy herds in northern Spain and the sources of minerals in different types of feed. Blood samples from organic and conventional dairy cattle and feed samples from the respective farms were analysed by inductively coupled plasma mass spectrometry to determine the concentrations of the essential trace elements (cobalt (Co), chromium (Cr), copper (Cu), iron (Fe), iodine (I), manganese (Mn), molybdenum (Mo), nickel (Ni), selenium (Se) and zinc (Zn)) and toxic trace elements (arsenic (As), cadmium (Cd), mercury (Hg) and lead (Pb)). Overall, no differences between organic and conventional farms were detected in serum concentrations of essential and toxic trace elements (except for higher concentrations of Cd on the organic farms), although a high level of inter-farm variation was detected in the organic systems, indicating that organic production greatly depends on the specific local conditions. The dietary concentrations of the essential trace elements I, Cu, Se and Zn were significantly higher in the conventional than in the organic systems, which can be attributed to the high concentration of these minerals in the concentrate feed. No differences in the concentrations of trace minerals were found in the other types of feed. Multivariate chemometric analysis was conducted to determine the contribution of different feed sources to the trace element status of the cattle. Concentrate samples were mainly associated with Co, Cu, I, Se and Zn (i.e. with the elements supplemented in this type of feed). However, pasture and grass silage were associated with soil-derived elements (As, Cr, Fe and Pb) which cattle may thus ingest during grazing.

Keywords

organic farmingtrace element statusdairy cow nutritionforagesoil ingestion
Type
Research Article
Information
animal , Volume 12 , Issue 6 , June 2018 , pp. 1296 - 1305
Copyright
© The Animal Consortium 2017 

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