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Influence of Grazing Intensity on Cyanogenic Toxicity In INFLUENCE OF GRAZING INTENSITY ON CYANOGENIC TOXICITY IN SAVANNA GRASSES IN BARINGO, KENYA ALFAYO KOSKEI A THESIS SUBMITTED TO THE GRADUATE SCHOOL IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF THE DEGREE OF MASTER OF SCIENCE IN NATURAL RESOURCES MANAGEMENT OF EGERTON UNIVERSITY EGERTON UNIVERSITY JUNE, 2016 DECLARATION AND APPROVAL DECLARATION This thesis is my original work and has not been submitted or published for any award of a degree or diploma in this university or any other university. Signature Alfayo Koskei NM 11/3665/13 Date APPROVAL This thesis has been presented with our approval as university supervisors. Dr. Elias K. Maranga (PhD.) Department of Natural Resources Faculty of Environment and Resource Development Egerton University Signature Date Dr. Obonyo Meshack (PhD.) Department of Biochemistry Faculty of science Egerton University Signature Date ii ACKNOWLEDGEMENT I gratefully acknowledge the professional support and mentorship of Dr. E.K.Maranga, Department of Natural Resources and Dr. M. Obonyo, Department of Biochemistry, Egerton University in the development of this thesis, from proposal phase through research phase and writing up of this thesis. Iam sincerely grateful to Dr. E.K.Maranga for field supervision and assistance with field research designs and Dr. M. Obonyo for allowing me to use the laboratory facilities of the Department of Biochemistry for my laboratory tests. I would like to give a special mention to Dr. Kirui, Department of Natural Resources who has been part of this project, reading and providing invaluable comments especially during concept note development and data analysis procedures. All fieldwork was made possible by the Dryland Grant Research Fund, through the Division of Research and Extension of Egerton University. Prof Kibor coordinated this award, enabling research to run smoothly. I wish to register my appreciation for this noble gesture. To all the project facilitators, field assistance and all the lecturers in Department of Natural Resources who contributed in one way or another in the preparation of this work; I would like to extend a big thank you. To Barsosio Abraham, thank you for being there at every step during my field work, am deeply humbled by the assistance you offered. iii COPYRIGHT © Alfayo Koskei, 2016 No part of this thesis may be reproduced, stored in any retrieval system or transmitted in any form or by any means (electronically, mechanically, photocopying or otherwise) except for short extracts with acknowledgements, without prior written permission of the author or Egerton University on behalf of the Author. All rights Reserved iv DEDICATION To my most supportive and loving mum Elizabeth Maina and my siblings Geoffrey, Kenneth, Janet, Emmy and Lily for their compassionate and endless support. v ABSTRACT The potential role of anti-herbivory mechanisms involving use of qualitative and quantitative compounds in minimizing herbivory is well known. However, synergistic responses to grazing and interactive effects on herbivores are poorly understood. The aim of this study was to quantify the interaction between cyanogenic glycosides in grasses with cattle grazing in Lake Bogoria (00°28'N, 35°59'E), Baringo County. Field experiments were carried out in ten 50×10m exclosures to quantify influence of grazing intensity and age of grasses on cyanogenic concentration. Grazing intensity was varied using simulated grazing method to determine the effect of grazing disturbance on cyanide concentration. Two grazing treatments which embraced heavy grazing (Clipping at 5cm height) and light grazing (clipping at 15cm height). Grasses were also categorized into two age classes; young (leaf blade length <2cm, no florescence and spikelet) and old (leaf blade length >2cm, florescence open and spikelet presence). Grass samples were tested for cyanogenic glycosides using impregnated picrate paper and concentration of the cyanogenic glycosides was determine by hydrolyzing the glycosides and trapping the cyanide evolved in 1M NaOH. The findings showed that five species out of 16 produced cyanogenic glycosides; Cynodon dactylon, Cynodon plectostachyus, Digitaria scalarum, Sporobolus spicatus and Cyperus laevigatus. Cyanogenic glycosides decreased with increase in age of plants. Young cuttings yielded more Hydrogen Cyanide than older cuttings of the same grasses though there were no significant difference (p-value>0.05 for all species). For example the concentration levels in young and old materials of C. dactylon 1.89 and 1.74 MgCN g-1 dw, C. plectostachyus 1.42 and 1.32, S. spicatus 1.26 and 1.17, C. laevigatus 1.24 and 1.47 and D. scalarum 1.21 and 1.13 MgCN g-1 dw. Grazing intensity had a significant effect on concentration of cyanogenic content in C. dactylon (1.14 and 1.50 MgCN g-1 dw, p-value<0.005) and C. laevigatus (1.27 and 1.58 MgCN g-1 dw) for control and second clipping respectively while the effect on others were not significant p>0.05 such as C. plectostachyus (1.23 and 1.42) S. spicatus 1.30 and 1.34) D. scalarum 1.22 and 1.28 and C. laevigatus (1.32 and 1.58 MgCN g-1 dw). On the basis on the findings, it is recommended that grazing regime of managed pastures should consider the age of pastures while allowing utilization of pastures preferably grazed on mature pastures with low levels of cyanogenic glycosides. Consequently the study recommends a response to a less grazing pressure on pastures and apparently avoid overstocking on managed pastures as the forage items concentrate relatively more defense glycosides with increase in disturbance. vi TABLE OF CONTENTS TITLE PAGE…………………………………………..…………………………………………i DECLARATION AND APPROVAL ...................................................................................... ii ACKNOWLEDGEMENT ...................................................................................................... iii COPYRIGHT .......................................................................................................................... iv DEDICATION ..........................................................................................................................v ABSTRACT............................................................................................................................. vi LIST OF TABLES ....................................................................................................................x LIST OF FIGURES ................................................................................................................ xi LIST OF PLATES ................................................................................................................. xii ACRONYMS ......................................................................................................................... xiii CHPATER ONE .......................................................................................................................1 INTRODUCTION .....................................................................................................................1 1.1 Background Information ....................................................................................................1 1.2 Statement of the Problem ...................................................................................................4 1.3 Objectives of the Study ......................................................................................................4 1.3.1 Broad objective ...........................................................................................................4 1.3.2 Specific objectives .......................................................................................................4 1.4 Research Hypotheses .........................................................................................................5 1.5 Justification of the Study ....................................................................................................5 1.6 Assumptions of the Study ..................................................................................................5 1.7 Scope of Study ...................................................................................................................5 1.8 Limitation of the Study ......................................................................................................6 1.9 Definition of Terms ...........................................................................................................6 CHAPTER TWO ......................................................................................................................8 vii LITERATURE REVIEW .........................................................................................................8 2.1 Cyanogenic Glycosides in Plants .......................................................................................8 2.2 Age of Vegetation and Cyanide Concentration ................................................................. 10 2.3 Cyanide Toxicity ............................................................................................................. 12 2.4 Cyanogenic Glycosides-Environment Interaction ............................................................. 13 2.5 Grazing Intensities and Cyanogenesis .............................................................................. 17 2.6 Research gaps .................................................................................................................. 20 2.7 Conceptual
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