Project – Evaluation of antibiotics residues in egg sample obtain from Keffi Market in Keffi Local Government Area of Nasarawa State.

CHAPTER ONE

INTRODUCTION

1.1 Background of the Study

Eggs are a staple food consumed globally due to their affordability, availability, and high nutritional value. They are considered a rich source of high-quality protein, essential amino acids, vitamins (such as B12, D, and A), and vital minerals like iron, phosphorus, and selenium. These nutrients make eggs a key component of many diets and an important food source, especially in developing countries like Nigeria, where protein deficiency is prevalent. However, the growing concerns over food safety have led to increasing scrutiny of the quality of eggs, particularly regarding contamination from chemical residues, including antibiotics.

Antibiotics are widely used in poultry farming for various reasons, including treating infections (therapeutic use), preventing the outbreak of diseases (prophylactic use), and promoting faster growth rates in birds (growth-promoting use). While these practices have significantly improved poultry health and production efficiency, they have also introduced potential health risks due to improper handling and misuse. In many cases, farmers fail to observe the mandatory withdrawal period — the time required between the last administration of an antibiotic and when animal products can be safely consumed. When this period is not observed, residues of these drugs may remain in animal products, including eggs, entering the human food chain (Okeke et al., 2018).

The ingestion of antibiotic-contaminated eggs poses serious health risks to consumers. Residual antibiotics in food products can lead to allergic reactions, toxic effects, and more importantly, the development of antibiotic-resistant bacteria, which has become a global public health threat (WHO, 2019). Long-term exposure to low levels of antibiotics through food may also disrupt the normal gut flora, leading to digestive and immune system complications. These health concerns underscore the importance of monitoring antibiotic residues in animal-derived food products to ensure they are within acceptable safety limits as defined by international regulatory bodies such as Codex Alimentarius and the World Health Organization.

In Nigeria, regulatory oversight of veterinary drug usage remains inadequate, especially at the local level. Farmers often have unrestricted access to antibiotics and use them without veterinary guidance, resulting in widespread misuse. Moreover, there is limited infrastructure and technical capacity to monitor and enforce compliance with food safety regulations. Several studies have highlighted the presence of antibiotic residues in poultry products in various parts of Nigeria, including chicken meat and eggs sold in markets (Azeez et al., 2020; Ibrahim et al., 2021). Despite this growing body of evidence, there is still a dearth of data specifically concerning markets in semi-urban areas like Keffi in Nasarawa State.

Keffi Local Government Area is recognized for its dynamic poultry farming sector, and the Keffi Market serves as a key commercial center for the sale of poultry products, including eggs. The increasing demand for eggs in the area, driven by population growth and changing dietary habits, has led to intensified poultry production. However, there is no routine surveillance or published research data evaluating the safety of eggs sold in the market with regard to antibiotic contamination. This lack of data limits the ability of health authorities to assess the risks and implement appropriate control measures.

Therefore, this study seeks to bridge the knowledge gap by evaluating the presence and concentration of antibiotic residues in egg samples obtained from Keffi Market. It aims to determine whether the detected levels comply with international maximum residue limits (MRLs) and to assess the potential implications for public health. By doing so, the study will provide crucial evidence that can inform policy decisions, guide food safety interventions, and raise public awareness on the importance of prudent antibiotic use in poultry farming.

1.2 Statement of the Problem

The extensive and often unregulated use of antibiotics in poultry farming has become a pressing public health concern globally, and Nigeria is no exception. Poultry farmers frequently administer antibiotics to birds not only for treatment but also for preventive and growth-promoting purposes. However, a major issue arises when these antibiotics are used without observing the recommended withdrawal periods — the time required for the drug to be metabolized and excreted from the animal’s system before the animal or its products are consumed. Failure to adhere to this period results in the persistence of antibiotic residues in poultry products, including eggs, which may then be ingested by unsuspecting consumers.

In many parts of Nigeria, including Keffi Market in Nasarawa State, there is an apparent lack of effective regulatory monitoring and routine testing for antibiotic residues in animal-derived food products. Poultry farmers often self-prescribe or obtain antibiotics over the counter without proper veterinary consultation, increasing the likelihood of misuse. Moreover, most consumers and even some traders remain unaware of the health risks associated with antibiotic-contaminated food products. The absence of local enforcement mechanisms or food safety surveillance systems means that eggs containing harmful residues could easily enter the food chain and be widely consumed without detection or accountability.

Previous research conducted in other regions of Nigeria has documented the presence of antibiotic residues in eggs at concentrations exceeding internationally accepted maximum residue limits (MRLs). For instance, studies by Salisu et al. (2016) and Ukoha et al. (2017) found measurable levels of oxytetracycline and other antibiotics in commercially sold eggs. These findings point to a nationwide issue that may also affect markets like Keffi, where similar poultry production practices prevail. Despite the significance of these findings, there is currently no published data assessing the levels of antibiotic residues in eggs sold in Keffi Market, leaving a critical gap in food safety knowledge and public health protection.

The risk is further exacerbated by the increasing demand for eggs in Keffi and its environs, driven by population growth, urbanization, and changing consumption patterns. As more households and food vendors rely on eggs as a source of protein, the potential exposure to antibiotic residues also increases. This situation calls for urgent investigation, as continued consumption of such contaminated eggs can contribute to a range of health problems including antibiotic resistance — one of the leading global threats identified by the World Health Organization — as well as allergic reactions, gut microbiome disruption, and toxic effects from long-term exposure.

This study, therefore, seeks to fill the existing gap in empirical data by evaluating the presence and concentration of antibiotic residues in egg samples obtained from Keffi Market. By determining whether these levels exceed established safety thresholds, the study aims to provide evidence-based insights into the safety of eggs consumed in the area and inform necessary interventions by public health authorities. Without such data, efforts to protect consumer health and promote responsible antibiotic use in poultry farming will remain hindered.

1.3 Objectives of the Study

The general objective of this study is to evaluate the presence and levels of antibiotic residues in egg samples obtained from Keffi Market, Nasarawa State.

The specific objectives are to:

1. Identify the types of antibiotics commonly used in poultry farms supplying eggs to Keffi Market.
2. Determine the concentration of antibiotic residues in egg samples collected from Keffi Market.
3. Assess the compliance of detected residue levels with international maximum residue limits (MRLs).
4. Evaluate the potential health risks associated with the consumption of eggs containing antibiotic residues.

1.4 Research Questions

The study seeks to answer the following questions:

1. What types of antibiotics are commonly administered in poultry farms in Keffi Local Government Area?
2. Are antibiotic residues present in eggs sold in Keffi Market?
3. What are the concentrations of these residues, and how do they compare with internationally accepted limits?
4. What potential health risks are associated with the consumption of eggs containing these antibiotic residues?

1.5 Research Hypothesis

H₀: There is no significant difference between the antibiotic residue levels detected in egg samples from Keffi Market and the maximum residue limits (MRLs) established by international food safety standards.

1.6 Significance of the Study

This study holds considerable significance as it provides the first comprehensive baseline data on antibiotic residues in eggs sold at Keffi Market in Nasarawa State. Despite the growing concerns over food safety and antibiotic resistance, there is currently no documented evidence regarding the extent of contamination in eggs sold in this locality. By systematically evaluating and quantifying antibiotic residues in egg samples, the research will fill a crucial gap in knowledge and serve as a reference point for future studies, public health assessments, and food safety initiatives in the region.

Furthermore, the study is poised to raise awareness among poultry farmers and egg vendors about the importance of responsible antibiotic use. In many cases, farmers rely on antibiotics without veterinary supervision and are unaware of the implications of skipping withdrawal periods before selling their products. By sharing the findings with stakeholders, the study can foster behavioral change and encourage more ethical and health-conscious practices in poultry farming. This, in turn, can lead to safer food production and reduced public health risks.

In addition to sensitizing farmers, the research will also be useful to public health and food safety authorities. Regulatory agencies such as NAFDAC, the Nigerian Veterinary Medical Association, and environmental health departments in Nasarawa State will benefit from data-driven insights that can inform their policies and enforcement mechanisms. The results can guide the establishment or strengthening of monitoring systems to detect and control veterinary drug residues in eggs and other poultry products at local and regional levels.

The study also addresses a critical consumer protection issue. Eggs are a widely consumed protein source, especially among low- and middle-income populations. Many consumers purchase eggs from local markets without any knowledge of their safety or the potential health risks posed by antibiotic residues. By identifying whether eggs sold in Keffi Market contain harmful residues, the study empowers consumers with vital information that can help them make more informed choices about where and what to buy, ultimately protecting their health and well-being.

Moreover, the findings of this research will contribute to the broader fight against antimicrobial resistance (AMR), which the World Health Organization has identified as one of the top ten global health threats. The consumption of low levels of antibiotics through food over time can contribute to the development of resistant bacteria in humans, reducing the effectiveness of critical medical treatments. Through its localized lens, this study adds to the global body of evidence advocating for responsible antibiotic use in animal husbandry as a means to mitigate AMR.

Finally, this study will serve as an academic resource and a basis for further scientific exploration. It will be particularly useful to researchers, students, public health professionals, and policymakers who are studying food safety, veterinary medicine, and public health in Nigeria. By presenting a localized case study of antibiotic residues in eggs, the research highlights the importance of integrating food safety into public health planning and agricultural policy, thereby fostering a more holistic approach to health and food security in the country.

1.7 Scope of the Study

The study is limited to the evaluation of antibiotic residues in table eggs sold in Keffi Market. The analysis will focus on commonly used antibiotics in poultry, such as tetracyclines, sulfonamides, and fluoroquinolones. The study will not cover residues of hormones, pesticides, or other veterinary drugs. Geographic scope is restricted to Keffi Local Government Area in Nasarawa State, Nigeria.

1.8 Limitations of the Study

Limitations of the study include the following:

• Limited sample size may affect the generalizability of the findings.
• Lack of comprehensive information from farmers regarding the exact antibiotics used.
• Constraints in laboratory equipment and reagents may limit the detection of a broader range of antibiotics.

1.9  Operational Definition of Terms

Antibiotic Residues: These are trace amounts of antibiotic substances that remain in animal products, such as eggs, after the drugs have been administered to the animals. In this study, antibiotic residues refer specifically to the remnants of veterinary antibiotics that may be detected in eggs sold in Keffi Market due to non-compliance with withdrawal periods.

Withdrawal Period: This refers to the minimum amount of time that must elapse between the last administration of a veterinary drug and the time when animal products (e.g., eggs) can be safely consumed. In this study, it denotes the period that should be observed by poultry farmers before selling eggs from medicated birds to ensure residue levels are safe.

Egg Samples: In this context, egg samples refer to the eggs collected from different vendors at Keffi Market in Keffi Local Government Area. These samples are subjected to laboratory analysis to detect the presence and levels of antibiotic residues.

Keffi Market: A major commercial marketplace located in Keffi Local Government Area of Nasarawa State, Nigeria. For the purpose of this research, it is the selected site where egg samples are sourced for analysis.

Maximum Residue Limit (MRL): MRLs are the highest levels of antibiotic residues legally permitted in food products, as set by regulatory agencies such as the Codex Alimentarius Commission or the World Health Organization (WHO). In this study, they serve as the benchmark for assessing whether the detected residues in eggs are within safe consumption limits.

Public Health Risk: This refers to the potential adverse effects on human health resulting from the consumption of contaminated eggs. In this study, it includes allergic reactions, antimicrobial resistance, and other health concerns associated with the ingestion of antibiotic residues.

Antibiotic Resistance: A condition where bacteria develop the ability to survive exposure to antibiotics that would normally kill them. In the context of this study, it is considered a long-term public health consequence of consuming food products containing low-level antibiotic residues over time.

Project – Evaluation of antibiotics residues in egg sample obtain from Keffi Market in Keffi Local Government Area of Nasarawa State.