ORIGINAL PAPER
Influence of soil contamination before and after ensiling on mineral composition of grass silages, feed intake and carry-over to body tissue of goats
| 1 | Saxon State Office for Environment, Agriculture and Geology, Department of Animal Husbandry, 04886 Köllitsch, Germany |
| 2 | Wrocław University of Environmental and Life Sciences, Department of Animal Nutrition and Feed Management, 51-631 Wrocław, Poland |
| 3 | Humboldt Universität zu Berlin, Faculty of Life Sciences, 10115 Berlin, Germany |
| 4 | Federal Institute for Risk Assessment (BfR), 10589 Berlin, Germany |
| 5 | Freie Universität Berlin, Department of Veterinary Medicine, Institute of Animal Nutrition, 14195 Berlin, Germany |
CORRESPONDING AUTHOR
S. D. Martens
Saxon State Office for Environment, Agriculture and Geology, Department of Animal Husbandry, 04886 Köllitsch, Germany
Saxon State Office for Environment, Agriculture and Geology, Department of Animal Husbandry, 04886 Köllitsch, Germany
Publication date: 2018-12-12
J. Anim. Feed Sci. 2018;27(4):307–316
KEYWORDS
TOPICS
ABSTRACT
(Fe) is ubiquitous in the environment and has possible impact
on quality and safety of feed and food due to the fact that it can be transferred
from soil to animal feed and further to the products of animal origin. Therefore,
the objective of the present study was to evaluate the effect of contamination of
forage with soil differing in Fe concentration on Fe solubility, mineral composition
and quality of grass silages. Furthermore, the effect of feeding these silages on
feed intake, performance, trace element absorbability and carry-over into edible
tissues was tested in young goats. Two ensiling experiments revealed that
treating grass without or with different levels and types of soil before ensiling
did not affect fermentation parameters of silages. Nevertheless, the addition of
soil caused a highly significant increase of crude ash and trace elements contents
in forage and silages. During ensiling, the in vitro solubility of Fe increased
on average 5 times. Also, the aluminium content was the best indicator of soil
contamination in forages. In a feeding trial with growing goats, feed intake and
live weight gain were decreased in the group fed grass ensiled with the soil in
contrast to the control group and animals receiving feed with soil added just
before feeding. Fe concentration was highest in the duodenal tissue of kids fed
the forage contaminated with soil before ensiling (184 vs 88–80 mg Fe/kg DM
in the other two treatments), which might be also an indicator of Fe regulating
properties. Fe concentration in the liver increased likewise. In conclusion, data
indicate that ingesting ensiled soil impairs animal performance.
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