German Institute of Animal Nutrition

Braunschweig, Germany

German Institute of Animal Nutrition

Braunschweig, Germany
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Ergot alkaloids (EA) are mycotoxins produced by Claviceps purpurea. EA-toxicity is poorly characterized for fattening chickens. Therefore, a dose–response study was performed to identify the lowest, and no observed adverse effect levels (LOAEL and NOAEL, respectively) based on several endpoints. Non-starch-polysaccharide (NSP) cleaving enzyme addition and dietary fat content were additionally considered as factors potentially influencing EA-toxicity. Feed intake was proven to respond most sensitively to the EA presence in the diets. This sensitivity appeared to be time-dependent. While LOAEL corresponded to a total dietary EA content of 5.7 mg/kg until Day 14 of age, it decreased to 2.03 mg/kg when birds were exposed for a period of 35 days. Consequently, NOAEL corresponded to an EA content of 2.49 mg/kg diet until Day 14 of age, while 1.94 mg/kg diet applied until Day 35 of age. Liver lesions indicating enzyme activities in serum were increased after 14 days of exposure. Dietary fat content and NSP-enzyme supplementation modified EA toxicity in an interactive manner. The EA residues in serum, bile, liver and breast meat were <5 ng/g suggesting a negligible carry over of intact EA. © 2017 by the author. Licensee MDPI, Basel, Switzerland.

Ergot alkaloids (EA) are mycotoxins formed by Claviceps purpurea. Due to the large variation in EA content, the mass proportion of ergot (hardened sclerotia) in animal diets is not suited to establish safe levels of EA. Therefore, the aim of the present study was to examine the dose-dependent effects of dietary EA on laying hens. Ergoty rye or ergot-free rye (control diet) was included in the diets either untreated or after hydrothermal treatment (“expansion”). The total EA levels in five different diets containing 0–3 % of untreated or expanded rye were 0.1–14.56 mg/kg (untreated rye) and 0.08–13.03 mg/kg (expanded rye). The average EA reduction amounted to 11 % due to expanding. The proportions of the sum of all -inine isomers however were consistently higher (19.5–48.4 %) compared to the sum of their -ine isomer counterparts which decreased at the same time. Most of the laying performance and reproductive traits were significantly compromised during the test period between weeks 22 and 42 of age when the diet with the highest EA content was fed. Toxic effects were less pronounced due to expanding. Relative weights of liver, proventriculus, and gizzard as well as the aspartate aminotransferase activity, the antibody titers to Newcastle disease virus, albumin, and total bilirubin concentrations were all significantly increased in hens fed at the highest dietary ergot level whereby expanding additionally modified the albumin and total bilirubin responses. No carry-over of EA into egg yolk and albumen, blood, liver, and breast muscle was found, but bile contained quantifiable levels of ergometrine and ergometrinine. Biological recovery of ingested individual alkaloids with the excreta varied from 2 to 22 % and was strongly positive linearly related to the octanol to water partition coefficient (logkOW). This suggests the lipophilicity of alkaloids as a factor influencing their metabolism and elimination. Based on the overall results of this study, a lowest observed adverse effect level (LOAEL) of 14.56 mg EA/kg for laying hen diets can be proposed, while the no observed adverse effect level (NOAEL) corresponds to a dietary EA level of 3.72 mg/kg. However, it must be stressed that these critical levels apply for the specific EA pattern tested in the present experiment, while batches of ergot containing a less typical alkaloid composition, or other expanding conditions, might contribute to variations in the LOAEL/NOAEL. © 2016, Society for Mycotoxin Research and Springer-Verlag Berlin Heidelberg.

Danicke S.,German Institute of Animal Nutrition | Winkler J.,German Institute of Animal Nutrition
Food and Chemical Toxicology | Year: 2015

The aim of the review was to evaluate the opportunities for diagnosing the zearalenone (ZEN) exposure and intoxication of farm animals by analyzing biological specimens for ZEN residue levels. Metabolism is discussed to be important when evaluating species-specific consequences for the overall toxicity of ZEN. Besides these toxicological facts, analytics of ZEN residues in various animal-derived matrices requires sensitive, matrix-adapted multi-methods with low limits of quantification, which is more challenging than the ZEN analysis in feed.Based on dose-response experiments with farm animals, the principle usability of various specimens as bio-indicators for ZEN exposure is discussed with regard to individual variation and practicability for the veterinary practitioner.ZEN residue analysis in biological samples does not only enable evaluation of ZEN exposure but also allows the risk for the consumer arising from contaminated foodstuffs of animal origin to be assessed. It was compiled from literature that the tolerable daily intake of 0.25 μg ZEN/kg body weight and day is exploited to approximately 8%, when a daily basket of animal foodstuffs and associated carry over factors are assumed at reported ZEN contamination levels of complete feed. © 2015 Elsevier Ltd.

Flachowsky G.,German Institute of Animal Nutrition
Animal Nutrition and Feed Technology | Year: 2010

High yielding plants with low external inputs should be the main aim of plant breeding in the future. Apart from traditional breeding, plant biotechnology seems to have a certain potential to contribute to this objective. The cultivation of genetically modified plants (GMP) increased worldwide from 1.7 (1996) to about 1125 million ha (2008). That means about 8% of arable land all over the world was cultivated by GMP in 2008. Nutritional and safety assessment of feed/food from GMP is urgently necessary. The results of the studies can be summarized as: Up to now about 800 million ha of GM-crops have been cultivated all over the world; Most animal studies were done with GM-crops of the 1 st generation (with input traits); No unintended effects in composition or contamination (except lower mycotoxins) and nutritional assessment of feeds from GM-crops of the 1 st generation were registered in more than 100 studies with food producing animals; Transgenic DNA and newly expressed protein did not show other properties as plant DNA or native proteins during feed treatment or in the animals. The following prospectives of GM-feed should be mentioned: Other experimental designs are recommended for nutritional and safety assessment of feeds from GM-crops of the 2 nd generation (with output traits); Furthermore, case by case studies seem to be necessary to answer open questions, more groups with isogenic counterparts should be included for nutritional and safety assessment; Feeding studies with food producing animals should also be used for safety assessment.

Danicke S.,German Institute of Animal Nutrition
Toxins | Year: 2015

Hardened sclerotia (ergots) of Claviceps purpureacontaminate cereal grains and contain toxic ergot alkaloids (EA). Information on EA toxicity in ducks is scarce. Therefore, the aim of the growth experiment (Day 0–49, n= 54/group) was to titrate the lowest observed adverse effect level (LOAEL) for total ergot alkaloids (TEA). A control diet was prepared without ergots, and the diets designated Ergot 1 to4 contained 1, 10, 15 and 20 g ergot per kg diet, respectively, corresponding to TEA contents of 0.0, 0.6, 7.0, 11.4 and 16.4 mg/kg. Sensitivity of ducks to EA was most pronounced at the beginning of the experiment when feed intake decreasedsignificantly by 9%, 28%, 41% and 47% in groups Ergot 1 to 4, respectively, compared to the control group. The experiment was terminated after two weeks for ducks exposed to Ergot 3 and 4 due to significant growth retardation. Ergot alkaloid residues in edible tissues werelower than 5 ng/g. Bile was tested positive for ergonovine (=ergometrine = ergobasine) with a mean concentration of 40 ng/g. Overall, the LOAEL amounted to 0.6 mg TA/kg diet suggesting that ducks are not protected by current European Union legislation (1 g ergot/kg unground cereal grains). © 2015 by the authors; licensee MDPI, Basel, Switzerland.

Flachowsky G.,German Institute of Animal Nutrition | Lebzien P.,German Institute of Animal Nutrition
Animal Feed Science and Technology | Year: 2012

Phytogenic substances such as plants, parts of plants and secondary products of herbal origin have gained attention in animal nutrition in recent years. More efficient feed conversion, improved animal health as well as reduced CH 4 emissions are important objectives for use of phytogenic substances in ruminant nutrition. A multi stage program is proposed for nutritional assessment and to study the influence of phytogenic substances on rumen fermentation, CH 4 emissions, animal health and performance, food safety and environmental impact. The program includes five stages being: (1) Botanical characterization of the plant(s) and their composition, (2) Analytical characterization of the active phytogenic substance(s), (3) In vitro studies to test effects of substances on rumen fermentation and methanogenesis (i.e., screening), (4) In vivo studies (e.g., feed intake, rumen fermentation, CH 4 emissions) and, (5) Long term feeding studies with target animal species/categories (e.g., animal health and performance, quality and safety of food of animal origin, environmental impact, adaptation of microbes). Details of the program and its potential importance are discussed. © 2012 Elsevier B.V.

Danicke S.,German Institute of Animal Nutrition | Brezina U.,German Institute of Animal Nutrition
Food and Chemical Toxicology | Year: 2013

The knowledge of factors influencing the kinetics, metabolism and bioavailability of the Fusarium toxin deoxynivalenol (DON) is a basic prerequisite for evaluation of the transfer (carry over) of the toxin and its metabolites into edible tissues, and for a physiological specimen-based diagnosis of intoxication. These aspects are addressed in the present review, and potentials and pitfalls of the suitability of analysis of physiological samples for evaluation of the DON exposure as a veterinary tool are discussed. For example, the farm animal species was shown to be a determining factor influencing the metabolic profile and the bioavailability of DON. Although linear relationships were derived between DON exposure of ad libitum and restrictively fed animals and DON or de-epoxy-DON concentration in the blood of pigs, dairy cows and sheep, it has to be considered that individual values might markedly deviate from these relationships, which makes interpretation of measured concentrations of DON and its metabolites difficult. The situation is further complicated by the lack of established relationships between DON residues in physiological matrices and the adverse effects of DON on the health and performance of farm animals. © 2013 Elsevier Ltd.

Doll S.,German Institute of Animal Nutrition | Danicke S.,German Institute of Animal Nutrition
Preventive Veterinary Medicine | Year: 2011

The contamination of cereal grains with toxic secondary metabolites of fungi, mycotoxins, is a permanent challenge in animal nutrition as health and performance of the animals may be compromised as well as the quality of animal derived food. Therefore the present article reviews the issue of mycotoxins in animal nutrition. As the Fusarium toxins deoxynivalenol (DON) and zearalenone (ZON) are of particular importance under the production conditions in central Europe and Germany, with respect to their frequent occurrence in toxicologically relevant concentrations, special emphasis is layed on those mycotoxins. The effects of DON and ZON on susceptible animals as well as management strategies to cope with the contamination of grain with those toxins are reviewed. © 2011 Elsevier B.V.

Danicke S.,German Institute of Animal Nutrition | Diers S.,German Institute of Animal Nutrition
Toxins | Year: 2013

Ergot alkaloids (the sum of individual ergot alkaloids are termed as total alkaloids, TA) are produced by the fungus Claviceps purpurea, which infests cereal grains commonly used as feedstuffs. Ergot alkaloids potentially modulate microsomal and mitochondrial hepatic enzymes. Thus, the aim of the present experiment was to assess their effects on microsomal and mitochondrial liver function using the 13C-Methacetin (MC) and 13C-α-ketoisocaproic acid (KICA) breath test, respectively. Two ergot batches were mixed into piglet diets, resulting in 11 and 22 mg (Ergot 5-low and Ergot 5-high), 9 and 14 mg TA/kg (Ergot 15-low and Ergot 15-high) and compared to an ergot-free control group. Feed intake and live weight gain decreased significantly with the TA content (p < 0.001). Feeding the Ergot 5-high diet tended to decrease the 60-min-cumulative 13CO2 percentage of the dose recovery (cPDR60) by 26% and 28% in the MC and KICA breath test, respectively, compared to the control group (p = 0.065). Therefore, both microsomal and mitochondrial liver function was slightly affected by ergot alkaloids. © 2013 by the authors; licensee MDPI, Basel, Switzerland.

Danicke S.,German Institute of Animal Nutrition | Doll S.,German Institute of Animal Nutrition
Food and Chemical Toxicology | Year: 2010

A 35-day piglet experiment starting from weaning (21 days of age, 7.7 ± 1.1 kg), was performed to examine the effects of feeding a control diet (CTR) and of a Fusarium toxin-contaminated diet (FUS) in the absence (-) or presence (+) of a probiotic additive (2.3 × 106 colony-forming units per g diet of a one-to-one ratio of Bacillus subtilis and B. licheniformis) (deoxynivalenol [DON] concentrations of the CTR-, CTR+, FUS- and FUS+ diets were 0.21, 0.20, 2.75 and 2.45 mg/kg, respectively) on performance, blood concentration of DON and on liver function as evaluated by a breath test. Feeding of the FUS diets significantly depressed performance while the probiotic supplement failed to improve performance either when added to the CTR or to the FUS diet. The DON concentrations in the blood of the piglets fed both FUS diets were not significantly different, while the concentration of its degradation metabolite, de-epoxy-DON, was lower than the detection limit. Thus, it can be concluded that the fed probiotic bacteria neither bound nor degraded DON prior to absorption. Taken together, the tested probiotic additive is not suited to prevent the performance depressing effects of DON in piglets. © 2009 Elsevier Ltd. All rights reserved.

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