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Improvement in Egg Production Traits in the Light Local Chicken Ecotype Using a Selection Index

Improvement in Egg Production Traits in the Light Local Chicken Ecotype Using a Selection Index

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DEDICATION

This research material, titled “Improvement in Egg Production Traits in the Light Local Chicken Ecotype Using a Selection Index” is dedicated to God for His boundless grace and guidance. It is also a tribute to all computer enthusiasts whose contributions made my research journey smoother and enriched my documentation process, making the experience truly fulfilling.



ACKNOWLEDGEMENT

I am profoundly grateful to everyone who contributed to the successful completion of this project. I am especially grateful to my Supervisor (Name), the Head of Department (Name), and the Lecturers in the Department of Agricultural Engineering (AE) for their invaluable guidance and support. I also acknowledge the contributions of authors and scholars whose works on Improvement in Egg Production Traits in the Light Local Chicken Ecotype Using a Selection Index provided essential insights. Special thanks go to my study area (and any funding organizations, if applicable) for their financial assistance. I am equally thankful to stakeholders, including mentors, teachers, and colleagues, for their encouragement and support. Finally, I deeply appreciate my family and friends for their patience and unwavering support throughout this journey. Your contributions have been instrumental in making this research a reality.



ABSTRACT

Fifty hens and five cocks from a random mating population of light local chicken ecotype(LLCE) were mated and the fertile eggs hatched to obtain the parent generation (G0) used for this study aimed at improving egg production traits in the LLCE using a selection index. The hens were monitored for short-term (90-days from first day of lay) egg production traits namely: Body Weight at First Egg (BWFE), Average Egg Weight (AEW) and Total EggNumber (TEN). Data obtained were subjected to statistical analysis using SPSS (2001) and paternal half-sib model with Harvey (1990) to estimate descriptive statistics and genetic parameters respectively. These were employed in constructing the selection index. Selection For all the selection criteria (BWFE, AEW and TEN) was in the positive direction. Selected Parents were mated to produce next generations − G1 and G2. Selection differentials,selection intensities and genetic response due to selection were also estimated. A control population which spanned for three generations (each generation had its own control population) was used to monitor environmental changes and to estimate the genetic changes due to selection.

There were significant increases (P<0.05) in BWFE, AEW, and TEN in the selected populations over the three generations of study such significant increases (P<0.05)were not observed in the control population. Heritability estimates for all traits in all generations and populations were moderate to high. The heritability of the index was also moderate. Such moderate to high heritability estimates indicate high additive genetic variances, implying that these traits were most passed on from the parents to their offspring.Low to high positive genetic and phenotypic correlations was observed between BWFE andAEW in all populations of study.

The genetic correlation and phenotypic correlation between WIFE and EN, and between ARE and EN, was moderate to highly negative for all generations and populations of study. A positive genetic correlation was observed between NEW and TEN in G2 of the selected population. A cumulative selection differential of 269.38g, 1.58g and 3.88 eggs were obtained for BWFE, AEW and TEN respectively.Selection response for traits increased over the generations in a fairly linear manner.Realized response per generation was estimated to be 94.22g, 0.84g and 4.85eggs for BWFE,AEW and TEN respectively. It is evident that the simultaneous inclusion of BWFE, AEW,and TEN in a selection index generally improved the performance of selected birds over the generations in the Light Local Chicken Ecotype.


Improvement in Egg Production Traits in the Light Local Chicken Ecotype Using a Selection Index

CHAPTER ONE

1.1 Introduction

… As a prelude to other parts of this study, this chapter will discuss the background upon which this study was initiated, the statement of problems that led to this study, the Aim and Objectives of the study. Others are Significance of the study, Scope of work, Research hypothesis and questions, Limitation of the study and Definition of technical terms.…

CHAPTER TWO

2.0 Literature Review

2.1 Introduction

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