Mycotoxicosis

1 / 18

What is mycotoxicosis?

A disease caused by bacterial endotoxins in feed

The toxic effect produced by ingestion of mycotoxins, the secondary metabolites of molds

A deficiency disease from poor feed formulation

2 / 18

Which fungal genera are the major mycotoxin producers in feed?

Aspergillus, Fusarium, and Penicillium

Lactobacillus and Bacillus

Saccharomyces and Candida

3 / 18

Which mycotoxin is classified as a Group 1 human carcinogen?

Zearalenone

Aflatoxin B1

Fumonisin B1

4 / 18

Aflatoxins are primarily produced by which genus?

Fusarium

Penicillium

Aspergillus

5 / 18

Which mycotoxin is most associated with estrogenic effects and reproductive problems?

Zearalenone

Ochratoxin A

T-2 toxin

6 / 18

Which is the primary target of deoxynivalenol (DON) toxicity?

Gastrointestinal tract

Kidney

Reproductive tract

7 / 18

How well can dairy cows and other ruminants degrade mycotoxins?

The rumen completely inactivates all mycotoxins before they can be absorbed

Rumen microbiota can degrade some mycotoxins, but this capacity is limited and toxin specific

Cows have no capacity at all to metabolize mycotoxins

8 / 18

What is meant by an "emerging" mycotoxin, such as enniatins or beauvericin?

A mycotoxin that is frequently detected in feed and feed ingredients but is not yet formally regulated or fully understood toxicologically

A new type of mycotoxin that recently appeared concomitantly with mold evolutionary adaptation to climate change

A mycotoxin that only affects newly born or young animals

9 / 18

When two or more mycotoxins occur together in feed, their combined effect on the animal is often:

Always exactly additive, so effects can simply be summed

Often greater than expected from either toxin alone, reflecting synergistic or more than additive interactions

Always neutralized, since the toxins cancel each other out

10 / 18

What is the main purpose of regulatory guidance limits for mycotoxins in feed?

To prevent any measurable reduction in feed conversion or growth performance

To protect animals from clinical toxicity and adverse health effects

To guarantee zero mycotoxin contamination in all feed batches

11 / 18

Which mycotoxin is primarily nephrotoxic (kidney damaging)?

Ochratoxin A

Zearalenone

Fumonisin B1

12 / 18

Fumonisins are most strongly linked to which condition in horses?

Equine leukoencephalomalacia

Laminitis

Colic

13 / 18

Why are mycotoxins difficult to manage once present in feed?

They evaporate during storage

They are heat stable and survive most feed processing

They are destroyed only by light exposure

14 / 18

What does "masked" or "modified" mycotoxin refer to?

A mycotoxin bound to plant compounds that escapes standard detection

A mycotoxin hidden inside the seed coat

A synthetic mycotoxin analog

15 / 18

Which condition most favors Fusarium toxin production?

Hot, dry storage

Wet conditions in the field (pre-harvest)

Frozen storage

16 / 18

A common consequence of low level chronic mycotoxin exposure is:

Sudden death only

Immunosuppression and reduced performance

Improved feed conversion

17 / 18

Which feed additive strategy is widely used to counter mycotoxins?

Adsorption (binding) and biotransforming agents

Adding extra salt

Organic acids

18 / 18

Why is testing a single feed sample often unreliable?

Mycotoxins are distributed unevenly ("hot spots") in feed

Tests only work on liquids

Mycotoxins change identity over time

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Mycotoxicosis

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