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Evolution of fat soluble vitamin content of ewe’s milk from conventional semi-extensive and organic production systems

Revilla, I.; Palacios, C.; Hidalgo, C.; Alvarez, R. and Rodriguez, P. (2014) Evolution of fat soluble vitamin content of ewe’s milk from conventional semi-extensive and organic production systems. In: Rahmann, G. and Aksoy, U. (Eds.) Building Organic Bridges, Johann Heinrich von Thünen-Institut, Braunschweig, Germany, 3, Thuenen Report, no. 20, pp. 983-986.

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During a 12-month study, bulk-tank milk was collected once a month from organic (O) (n=3) and conventional semi-extensive (CSE) (n=5) ewe’s dairy farms in the Castile and León region (northwest Spain). CSE is the most similar conventional production system to the organic one because they are both part-time grazing system. Milk samples were analysed for retinol, -tocopherol and -tocopherol. The production system and the sampling month affecting the milk fat vitamin content were investigated. Results show that organic ewe’s milk showed significantly higher contents of -tocopherol and -tocopherol and consequently of total tocopherol possibly due to the higher green pasture intake (1,02 vs 0.48 kg sheep-1 day-1) and the lower milk yield (53.5 vs 88.7). Although milk from CSE showed slightly higher values for retinol there were not statistically significant differences between CSE and O. Sampling month significantly affected retinol that tended to increase from February to May, and -tocopherol contents that were higher in autumn and winter months. During these months organic samples showed higher -tocopherol contents than conventional ones. A strong effect of season was observed for -tocopherol only for organic samples that showed a strong increase from March up to June.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Production system, bulk tank milk, year variation
Agrovoc keywords:
EnglishEwe milkhttp://aims.fao.org/aos/agrovoc/c_16081
Subjects: Food systems > Food security, food quality and human health
Research affiliation: Spain > University of Salamance
International Conferences > 2014: 18th IFOAM OWC Scientific Track: 4th ISOFAR Scientific Conference
Deposited By: Revilla, Dr Isabel
ID Code:23854
Deposited On:29 Oct 2014 08:30
Last Modified:29 Oct 2014 08:30
Document Language:English
Refereed:Peer-reviewed and accepted
Additional Publishing Information:urn:nbn:de:gbv:253-201407-dn053621-1

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