Genetic Evaluation of Growth and Reproductive Traits in Indigenous and Exotic Chicken Breeds

CHAPTER ONE: INTRODUCTION

1.1 Background to the Study

Poultry farming remains a vital component of the livestock industry in many developing nations. Chickens are a primary source of affordable animal protein through meat and eggs. However, the productivity of indigenous chicken breeds often remains low compared to exotic breeds due to differences in genetic potential, feeding efficiency, and management systems (Ajayi, 2010).
Genetic evaluation provides a scientific means of assessing the performance of animals for selection and breeding purposes. It involves the measurement of heritable traits such as body weight, feed conversion ratio, age at first lay, egg production rate, and fertility (Falconer & Mackay, 1996).
In Nigeria, indigenous chickens possess unique adaptive features, including disease resistance and tolerance to harsh environments, while exotic breeds are known for their high productivity under intensive management (Nwosu et al., 2013). Combining these genetic resources through evaluation and selection can enhance overall productivity and sustainability in poultry farming.

1.2 Statement of the Problem

Despite the importance of poultry production, indigenous chicken breeds still exhibit poor growth performance and low reproductive output. Many farmers prefer exotic breeds, which are more productive but less adapted to local conditions. Lack of adequate genetic evaluation limits the understanding of the genetic potential of indigenous chickens, leading to poor breeding decisions (Olawoyin, 2019). There is a pressing need for systematic evaluation to identify superior breeds or crossbreeds that combine productivity and adaptability traits.

1.3 Objectives of the Study

The main objective of this study is to evaluate the growth and reproductive traits of indigenous and exotic chicken breeds.
Specific objectives include:

1. To compare the growth performance of indigenous and exotic chickens.

2. To assess the reproductive efficiency of both breeds.

3. To determine the heritability of key growth and reproductive traits.

4. To recommend suitable breeds for improved poultry production under local conditions.

1.4 Research Questions

1. What are the growth differences between indigenous and exotic chicken breeds?

2. How do reproductive traits vary between the two groups?

3. Which traits show high heritability and can be improved through selection?

1.5 Significance of the Study

This research will provide valuable genetic data for poultry breeders, helping in the selection of superior birds with high productivity and adaptability. It will also support policymakers in developing breeding programs that enhance food security and income generation among rural farmers.

1.6 Scope and Limitation of the Study

The study will focus on selected indigenous and exotic chicken breeds reared under controlled conditions. Limitations may include environmental factors, feed availability, and sample size.

1.7 Definition of Terms

• Genetic Evaluation: The process of estimating genetic merit based on measurable traits.

• Indigenous Breeds: Local chicken varieties adapted to native environments.

• Exotic Breeds: Imported breeds with high productivity but low adaptability.

References
Ajayi, F. O. (2010) Nigerian indigenous chicken: A valuable genetic resource for meat and egg production. World’s Poultry Science Journal, 66(4), 611–620.
Falconer, D. S. and Mackay, T. F. C. (1996) Introduction to Quantitative Genetics. 4th ed. Longman.
Nwosu, C. C., Ogbu, C. C. and Ezema, C. (2013) Comparative performance of local and exotic chickens in Nigeria. Nigerian Journal of Animal Science, 15(2), 45–52.
Olawoyin, O. A. (2019) Genetic parameters of growth traits in Nigerian chickens. Journal of Applied Poultry Research, 28(3), 690–698.