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Diversity of Poisonous Plants and Their Antidotes, Affecting Ruminant Livestock Production on Rangelands in Ghana

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Diversity of Poisonous Plants and Their Antidotes, Affecting Ruminant Livestock Production on Rangelands in Ghana Ghana118 J. Sci. 61 (2), 2020, 118 - 132 GHANA JOURNAL OF SCIENCEhttps://dx.doi.org/10.4314/gjs.v61i2.12VOL. 61 DIVERSITY OF POISONOUS PLANTS AND THEIR ANTIDOTES, AFFECTING RUMINANT LIVESTOCK PRODUCTION ON RANGELANDS IN GHANA C. Y. F. Domozoro*, C. C. Wilcock, M. D. Swaine And A. H. Price (C. Y. F. D.:UK Corresponding Author: current Address, CSIR – Animal Research Institute, P. O. Box AH20, Achimota, Accra, Ghana; C. C. W., M. D. S. & A. H.P.: School of Biologi- cal Science, College of Life Sciences and Medicine, University of Aberdeen, UK). *Corresponding author’s email: [email protected] ABSTRACT The survival of the extensive livestock system, the practice for most farmers in the livestock industry in Ghana depends heavily on the natural pastures as forage resource. To efficiently use the rangelands, knowledge of the species composition, especially that of poisonous plants is essential. Documented knowledge in Ghana is scanty; documentation and dissemination of the knowledge resource would enable a wider access and wider benefit to stakeholders. A study was conducted in Ghana on poisonous plants with the aim to discover the existence and diversity of poisonous plants and associated antidotes affecting livestock for documentation and preservation of knowledge. 70 different items were cited; 22 were poisonous plants for which antidotes were not cited, 28 were poisonous plants with known antidotes and 32 antidotes. There were 575 citations of plants from 194 reported cases of suspected plant poisoning, categorized as poisonous plants for which no antidotes were cited (146), poisonous plants with cited antidotes (147) and antidotes (282). 50 plants species were identified and belonged to 29 plant families. Some plants were known only by local names. There was an extensive knowledge of the diversity of poisonous plants and antidotes within the ecological zones along with possible antidotes. Keywords: Poisonous plants, livestock, Indigenous knowledge, diversity, Ghana, Rangelands Introduction 1991). Ethnoecology was introduced (Toledo, Documenting indigenous environmental 1992) later in the same light of describing and knowledge has for some time now, become finding use for the knowledge resource. The a growing concern. The acronym TEK, profusion of acronyms and headings suggests which stands for “Traditional Environmental the rapid emergence of this perspective within Knowledge” (Williams, Baines, & Brownlee, several independent academic networks 1993) has become widely used to describe (Hunn, 1999). environmental knowledge attributable to The focus of science and research has indigenous people, as has IK – Indigenous been to integrate IK as a key to sustainable Knowledge (D. W. Brokensha, Warren, & development (D. Brokensha & Warren, Werner, 1980; Cunningham, 1991; Warren, 1980; Chambers, Pacey, & Thrupp, 1989; GJS is an Open Access Journal and distributed under the terms of the Creative Commons (CC) License [CC BY 4.0] VOL. 61 GHANA JOURNAL OF SCIENCE 119 Erdelen, 2002; Homann & Rischkowsky, In competitive systems, the livestock obtain 2001; Warren, 1989). As a consequence, a a substantial proportion of their dietary needs wealth of information on IK pertaining to from rangelands and pastures of the country soils, plants and animals has been compiled and it is not uncommon to find poisonous (Bizimana, 1994). Nevertheless, examples of plants growing on cultivated or natural, the integration of IK into the research process and private or public grazing lands (James, and its application within the development Nielsen, & Panter, 1992). Poisonous plants on context remain scarce as rightly observed by rangelands have socio-economic effects and Homann & Rischkowsky (2001). impacts the livestock industry in various ways. Changing landscape, especially in Due to the elusive, hard-to-define, almost agriculture and general deforestation, affects impossible-to-count nature of the problem, it the composition of plant and animal species. has made it very difficult to set an actual value In the case of agriculture and poisonous plants, on the economic losses sustained because of the effect of deteriorating rangelands from livestock poisoning due to plant ingestion, grazing pressure on some wild species may however, it is generally recognized as one of pave way for the spread of undesirable and/or the most important economic impediments to poisonous plant species because the resulting profitable livestock production (James et al., niche may favour the latter, increasing their 1992). For an efficient use of the rangelands, abundance and the associated problems. On the a good knowledge of the species composition, contrary, renewable resources including plant especially that of the poisonous plants is species that are valuable to rural communities, essential. Documented knowledge of such including antidotes to poisonous plants, may plants is scanty in Ghana; the CSIR-Animal face extinction from over exploitation and Research Institute attempted a study aimed at deforestation (Kiringe, 2005; Southgate & documenting poisonous plants on rangelands Sanders, 1990) and the effects of changing in Ghana around 1970 - 1975 (annual reports), climate may threaten the survival of vital flora but has no records of the findings. Preceding and fauna and, by extension, the people who this work, Irvine, assisted by Dokosi (Irvine, depend on the ecosystem for their survival. 1961), and later Persistent rising temperatures, changing Dokosi alone (Dokosi, 1998) in their rainfall patterns and seasons and increasing general accounts of the woody plants of grazing pressures on natural pastures resulting Ghana and Herbs of Ghana respectively, also from some degrading communal grazing fields list plants reported as poisonous in Ghana. stemming from poor management practices A documentation of existing information and opening up of the country to transhumant specifically on poisonous plants and the livestock movements, put pressure on livestock industry and dissemination of such resource availability, especially the botanical knowledge resource would enable a wider composition of the rangelands that support the access and a wider benefit to stakeholders. system. The aim of this study was to expand the existing The survival of the extensive livestock information and diversity of poisonous plants system which is the practice for most farmers in affecting livestock production on Ghanaian the livestock industry in Ghana depends heavily rangelands and document them as a means on the natural pastures as a forage resource. of preservation of knowledge to augment 120 GHANA JOURNAL OF SCIENCE VOL. 61 plant information on livestock health services livestock provided. An incident of plant and management of the productivity of the poisoning with possible strategy(ies) for rangelands. managing the situation, while items listed in a report as potentially poisonous to livestock, an Experimental antidote or other, represents a citation. Several Ghana is situated on the west coast of Africa, materials could be cited in a report. At the extending from latitude 41/2 N to about latitude end of interviews, respondents could choose o o 1 o 11 N and between longitudes 1⅟2 E to 3 /2 W between two options to provide plant and/or with a total area of 238 540 km2. The country other material samples cited in discussion; has a north-south extent of about 670 km and a either taking the author to the field to fetch maximum east-west extent of about 560 km. It the plant or going alone to obtain samples, shares borders with Côte d’Ivoire and Burkina which were brought back to the author. Faso to the west, Burkina Faso to the north, Voucher specimens of plants cited were and Togo to the east. To the south are the Gulf pressed with the aid of a field press to absorb of Guinea and the Atlantic Ocean. excess moisture and preserve plants in good Ecologically, Ghana is diverse, but the forest, condition for later study. The pressed material savannah, and rainfall distribution are the was labelled with collection date, local name, dominant factors affecting human activities location and recorded use (poison or antidote). (Dickson & Benneh, 1970; Owen, ; Phillips). Voucher specimens have been deposited at the The Vegetation consists of hardwoods and University of Aberdeen Herbarium (ABD) and scattered trees and secondary climbers, the Animal Research Institute, Ghana. shrubs, and soft woody plants. In addition to The plants were identified using Irvine the scattered trees and secondary vegetation, (1961) & Dokosi (1998) and confirmed by some grass species have appeared to form a comparing them with herbarium specimens in derived savannah. The wooded savannah, the the Ghana Herbarium, University of Ghana. largest vegetation zone, consists mostly of Occasionally specimens provided did not have grasses and acacias (Dickson & Benneh, 1970; enough features for a conclusive identification Harvey). The grasses are sensitive to trampling and some respondents provided local names; by livestock and to selective grazing and are but could not provide species names, these replaced easily by less nutritious grasses and remained unidentified and have been noted by acacias and thickets. in the results. Nomenclature follows the A structured questionnaire interview African flowering plants database (2008), was conducted in 2003 with respondents from the International Plant Names Index (2008) three zones in Ghana (northern zone, middle and the Germplasm Resources Information belt and southern zone) pooled together for
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