Mycotoxins are secondary metabolism of filamentous fungi, which under suitable temperature and humidity conditions, and found in various foods and feeds, causing negative effect for human and animal health.There are different mycotoxins which have agricultural and economic importance including aflatoxins, ochratoxins, trichothecenes, zearalenone, fumonisins, tremorgenic toxins, and ergot alkaloids. Mycotoxins occur more frequently in areas with a hot and humid climate, favourable for the growth of molds, they can also be found in temperate zones.In comparison to monogastric species, ruminant animals are generally less susceptible to the adverse effects caused by contamination of feeds with mycotoxins because presence of rumen microflora in rumen. However, a number of mycotoxins resist rumen degradation, causing distinct clinical signs of intoxication. Dairy cattle can be exposed to different number of mycotoxins because complex feeding diet originating from different feed materials such as roughage and concentrates. Exposure of diary catte to these mycotoxins may result in unexpected health problem. Due to apre-existing negative energy balance, cows in the transition period are considered to be particularly sensitive to the exposure to feeds. The variation of mycotoxinoccurence due to different factors, including agricultural practices and climatic conditions. Aflatoxins (AFs) are found in maize and peanuts, aswell as in tree nuts and dried fruits. OTA is found mainly in cereals, but significant levels of contamination may also occur in wine, coffee, spices and dried fruits. Other products of concern are beans, roasted coffee and cocoa, malt and beer, bread and bakery products, wines and grape juices, spices, poultry meat and kidneys, pig kidneys and pork sausages. The production of secondary metabolism is the effect of Fungal metabolism Secondary metabolites, are formed from a relatively small number of branch points of primary metabolic pathways. Among them some of these secondary metabolites are used as antibiotics, while others are very toxic and carcinogenic to humans and animals.Economic impact associated with mycotoxicosisincluding:Slower growth rates, Poor conception rates, inconsistentmanure, Increased disease susceptibility, Reduced production performance, loss of animal and human life, veterinary and public cost of treatment.
Table of Contents
1. INTRODUCTION
2. LITERATURE REVIEW
2.1. occurrence and signifinance of mycotoxins
2.2. Aflatoxin
2.3. Ochratoxin
2.4. Zearalenone
3. NEGATIVE EFFECTS OF MYCOTOXINS ON NON- RUMINANTS
3.1 Poultry
3.2. Pigs
3.3. Horses
4. NEGATIVE EFFECTS OF MYCOTOXINS ON RUMINANTS
4.1. Cattle
4.2. Sheep
4.3. Other Ruminants
5. METABOLISM OF MYCOTOXINS
6. ECONOMIC IMPACT OF MYCOTOXINS
7. CONCLUSION AND RECOMMENDATION
8. REFERENCES
Objectives and Research Themes
This seminar paper aims to analyze the occurrence and toxicological impact of mycotoxin contamination in various agricultural feedstuffs, focusing on how these toxins impair the health and productivity of major livestock species, including poultry, swine, and ruminants, while evaluating the broader economic consequences of such contamination.
- Occurrence and frequency of mycotoxins in diverse animal feed sources.
- Toxicological analysis of mycotoxin intake on livestock performance.
- Comparative sensitivity of monogastric animals versus ruminants.
- Economic ramifications of mycotoxin-induced livestock productivity loss.
- Metabolic pathways of mycotoxins in animals.
Excerpt from the Book
2.1. occurrence and signifinance of mycotoxins
Mycotoxicoses are diseases produced from most common fungi toxinknown as Mycotoxins directly or in combination with other primary stressors such as pathogens (Raju and Devegowda, 2000). Mycotoxicoses in humans or animals are characterized as food or feed related, non-contagious, non-transferable, non-infectious, and non-traceable to microorganisms other than fungi. Clinical symptoms usually subside upon removal of contaminated food or feed. A wide range of commodities can be contaminated with mycotoxins both pre- and post-harvest (CAST, 2003).
The occurrence of the fungi in the field is related to several factors, including agricultural practices and climatic conditions .There are different fungi species , such as Aspergillus fumigatus, Penicillium roqueforti, P. paneum, F. oxysporum and Monascus ruber that are able to tolerate both high levels of organic acids and carbon dioxide in addition to low availability of oxygen . In particular, presence of oxygen in some parts of silage during storage or oxygen penetration during feed-out and aerobic spoilage phases could allow mold growth and mycotoxin production. In high quality silage, lactic acid bacteria are effective in hindering any mold growth, but just a small raise in the oxygen concentration could provide the right growth conditions for fungi such as P. roqueforti and P. paneum. Indeed, if most of acetic and lactic acids as well as carbon dioxide evaporate and more oxygen is present, nearly all cereal-associated filamentous fungi may grow.The variation of mycotoxin occurence and concentration depend on environment related factors (Gallo A.,2015).
Aflatoxins (AFTs) are found in maize and peanuts, as well as in tree nuts and dried fruits. OTA is found mainly in cereals, but significant levels of contamination may also occur in wine, coffee, spices and dried fruits. Other products of concern are beans, roasted coffee and cocoa, malt and beer, bread and bakery products, wines and grape juices, spices, poultry meat and kidneys, pig kidneys and pork sausages (Milicevic et al., 2008).
Summary of Chapters
1. INTRODUCTION: Provides an overview of mycotoxins as secondary fungal metabolites that threaten global food security and animal health by causing widespread economic losses and immune system impairment.
2. LITERATURE REVIEW: Examines the environmental factors favoring fungal colonization, specific types of mycotoxins like Aflatoxin and Zearalenone, and their biological significance.
3. NEGATIVE EFFECTS OF MYCOTOXINS ON NON- RUMINANTS: Details the high sensitivity of poultry, pigs, and horses to mycotoxins, describing specific pathologies like hepatic dysfunction and reproductive failure.
4. NEGATIVE EFFECTS OF MYCOTOXINS ON RUMINANTS: Explores the comparative resilience of ruminants due to rumen microflora while noting the clinical impacts on cattle, sheep, and other ruminant species.
5. METABOLISM OF MYCOTOXINS: Outlines the detoxification and metabolic transformation processes, specifically highlighting Phase-I and Phase-II reactions in the liver and intestine.
6. ECONOMIC IMPACT OF MYCOTOXINS: Discusses the financial burden caused by yield losses, veterinary expenses, and the rejection of contaminated commodities in global markets.
7. CONCLUSION AND RECOMMENDATION: Summarizes the necessity of stringent sanitary measures, increased awareness, and biotechnological interventions to mitigate mycotoxin prevalence.
8. REFERENCES: A comprehensive list of scientific literature and studies cited throughout the seminar paper.
Keywords
Mycotoxin, Aflatoxin, Ochratoxin, Zearalenone, Livestock, Poultry, Ruminants, Swine, Mycotoxicosis, Fungal metabolites, Animal health, Feed contamination, Metabolic pathway, Economic impact, Agricultural productivity
Frequently Asked Questions
What is the fundamental focus of this seminar paper?
The paper provides a comprehensive review of mycotoxin contamination in animal feed and its subsequent negative effects on the health and productivity of various livestock species.
Which livestock groups are discussed in the study?
The study categorizes animals into non-ruminants, specifically poultry, pigs, and horses, and ruminants, including cattle, sheep, and other ruminant species.
What is the primary objective of this research?
The objective is to review the frequency of mycotoxin occurrence in feedstuffs, analyze their toxicological effects on livestock performance, and understand their overall economic impact.
Which scientific methods were utilized?
This work is a secondary research paper that systematically compiles and analyzes existing scientific literature, case studies, and reports on mycotoxicosis from various scholarly sources.
What topics are covered in the main section of the paper?
The main sections cover the classification and occurrence of mycotoxins, their specific pathological effects on different animal species, metabolic detoxification processes, and a detailed economic analysis.
Which keywords are essential to understanding this work?
Key terms include Mycotoxin, Aflatoxin, Ochratoxin, Zearalenone, Ruminants, Poultry, and Mycotoxicosis.
Why are ruminants generally less susceptible to mycotoxins than monogastric animals?
Ruminants typically have higher resistance because the microbial population present in their rumen is capable of degrading certain toxins before they can be absorbed into the system.
What role does Zearalenone play in livestock reproduction?
Zearalenone acts as a non-steroidal estrogenic mycotoxin that competes with natural estrogen receptors, leading to reproductive disorders such as uterine enlargement and fertility failure.
How is Aflatoxin B1 metabolized in the liver?
Aflatoxin B1 undergoes oxidative metabolism primarily through the CYP450 enzyme supergene family, leading to various metabolites that can significantly impair cellular functions.
What recommendation does the author provide for farmers?
The author recommends implementing better sanitary and storage conditions, increasing awareness of contamination risks, and using binding agents to limit the bioavailability of toxins in feed.
- Quote paper
- Gizaw Mekonnen (Author), 2019, Review on Impact of Mycotoxin Contamination on Animal Health and Productivity, Munich, GRIN Verlag, https://www.grin.com/document/512610
