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Organic diets with alfalfa silage for laying hens: Egg quality

Carrasco, S.; Wüstholz, J.; Hahn, G. and Bellof, Gerhard (2017) Organic diets with alfalfa silage for laying hens: Egg quality. Paper at: 14. Wissenschaftstagung Ökologischer Landbau, Campus Weihenstephan, Freising-Weihenstephan, 07.-10. März 2017.

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Summary

Laying hens were fed with organic diets containing chopped, extruded or pelleted alfalfa silage and the quality of the eggs was evaluated. Four groups were conformed:
a control group (A) fed with a complete feed mixture (CFM) and three silage groups (B, C and D) fed with a supplementary feed mixture (SFM). The SFM was formulated
based on an assumed ingestion of 20 % silage and rapeseed oil was used as energy source. Before ensiling, the alfalfa was chopped (B) and additionally extruded (C).
One half of the extruded silage was pelleted together with the SFM to produce the pelletized silage (D). Eggs from hens fed with silage (B, C and D) contained 2.4 times
more n-3 fatty acids than A. The thermally treated silage (C and D) produced higher concentrations of saturated fatty acids. B and C (high rapeseed oil intakes) showed
the highest monounsaturated fatty acids. In spite of the high fat intake, their cholesterol levels were similar to A (A: 12.4; B: 12.3; C: 12.6 mg/g yolk; p > 0.05) due
to the anti-cholesterolemic effect of the alfalfa. D consumed the lowest amount of fat but the highest amount of silage, corresponding to the lowest cholesterol level. The fat consumed was essential in the absorption of carotenoids. Thus, yolks from the silage groups showed decreasing values for the intensity of red and yellow colour as the
intake in terms of the amount of fat/silage decreased.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:alfalfa silage, cholesterol, fatty acids, yolk colour, laying hens
Subjects: Animal husbandry > Feeding and growth
Animal husbandry > Production systems > Poultry
Research affiliation: Germany > University of Applied Science Weihenstephan
Germany > Federal Research Institute of Nutrition and Food - MRI
Germany > Federal Research Institute of Nutrition and Food - MRI > Department of Safety and Quality of Meat
International Conferences > 2017: Scientific Conference German Speaking Countries
International Conferences > 2017: Scientific Conference German Speaking Countries > Animal nutrition
ISBN:978-3-89574-925-4
Deposited By: Hasreiter, Anna
ID Code:31773
Deposited On:04 Jul 2017 17:23
Last Modified:04 Jul 2017 17:23
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted
Additional Publishing Information:Dieser Beitrag ist im Tagungsband der 14. Wissenschaftstagung erschienen.
S. Wolfrum, H. Heuwinkel, H.J. Reents, u.a. (Hrsg.) (2017): Ökologischen Landbau weiterdenken - Verantwortung übernehmen - Vertrauen stärken. Beiträge der 14. Wissenschaftstagung Ökologischer Landbau, Freising-Weihenstephan, 7.-10. März 2017
Verlag Dr. Köster, Berlin

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