Philosophiae Doctor - PhD / This study is an investigation of the informal trans-border Chewa ethnic movement of Malawi, Mozambique and Zambia and its relationship to the formal state boundaries defined by the Westphalian model. The Chewa refer themselves as belonging to a Kingdom (formerly the Maravi Kingdom) which currently cuts across the three modern African states of Malawi, Mozambique and Zambia and its paramount, King Gawa Undi, is based in Zambia. The secretariat of the kingdom is Chewa Heritage Foundation (CHEFO), which is headquartered in Malawi. The fundamental quest of this study is to investigate how the Chewa understand, experience, manage and interpret the overlap between formal states (as defined by the Westphalian model) and informal trans-border ethnic identity without raising cross-border conflicts in the process. Indeed, it is this paradoxical co-existence of contradictory features of Westphalian political boundaries and trans-border ethnic identity that initially inspired this study. The main research aim is to interrogate whether the Chewa Kingdom (of Malawi, Mozambique and Zambia) is challenging or confirming state boundaries, and to reflect on what this means for the contemporary Westphalian model. In International Relations (IR), the Westphalian model provides the assumption that states are independent actors with a political authority based on territory and autonomy. Despite a large number of criticisms of the model, it has not completely been dismissed in explaining some elements of the international system. This is evident by the underlying assumptions and perspectives that still persist in IR literature as well as the growing contemporary debates on the model, especially on its related elements of state sovereignty and citizenship. In Africa, the literature focuses on the formal structures and ignores the role of informal trans-border traditional entities - specifically, how trans-border traditional entities affect the re-definition of state and sovereignty in Africa. Such ignorance has led to a vacuum in African IR of the potentiality of the informal to complement the formal intra-regional state entities. Within a historical and socio-cultural framework, the study utilises [social] constructivism and cultural nationalism theories to critically investigate and understand the unfolding relationship between the Westphalian state and Chewa trans-border community. Another supporting debate explored is the relevance of traditional authorities under the ambit of politics of representation. In this case, the study fits in the emerging debate on the meaning, experience and relevance of state sovereignty and national identity (citizenship) in Africa. Drawing on a wide range of sources (informant interviews, focus group discussions, Afrobarometer survey data sets, newspaper articles and comparative literature surveys in Malawi, Mozambique and Zambia), the study finds that although the upsurge of Chewa transborder ethnic identity is theoretically contradictory to the Westphalian model, in practice it is actually complementary. Within the framework of [social] constructivism, the state has with some variations demonstrated flexibility and innovation to remain legitimate by co-opting the Chewa movement. In this case, the study finds that the co-existence of Westphalian model and trans-border Chewa ethnic identity is mainly due to the flexibility of the state to accommodate informal ethnic expressions in ways that ultimately reinforces the mutual dependence of the states and the ethnic group. For instance, during the Chewa Kulamba ceremony held in Zambia, the state borders are „relaxed‟ to allow unhindered crossing for the participants to the ceremony. This does not entail weakness of the state but its immediate relevance by allowing communal cultural expressions. Another finding is that the Chewa expression of ethnic identity could not be complete if it did not take a trans-border perspective. This set-up ensures that each nation-state plays a role in the expression of Chewa ethnic identity - missing one nation-state means that the historical and contemporary relevance of this identity would be lost. It is also this same set-up that limits the movement's possibility to challenge the formal state. This argument reinforces the social constructivist perspective that sovereignty is not static but dynamic because it fulfils different uses in a particular context. The overall argument of this study is that the revival of the informal Chewa trans-border traditional entity offers a new, exciting and unexplored debate on the Westphalian model that is possibly unique to the African set-up. One theoretical/methodological contribution of this study is that it buttresses some suggestions that when studying African IR, we have to move beyond the strict disciplinary boundaries that have defined the field and search for other related African state experiences. The study also strengthens one of the new approaches in understanding IR as social relations - in this approach, individuals and their activities or their social systems play a prominent role.

Recent scholarship on Africa gives the impression of a singular narrative regarding Pentecostalism, that of inexorable rise. Indisputably, Pentecostalism's "explosion" throughout the global South is one of today's more remarkable religious phenomena. Yet what can we learn by shifting attention from the places where Pentecostal churches succeed to where they fail? Attending to this question offers an opportunity to reassess a regnant theoretical paradigm within recent studies of Pentecostalism: that of discontinuity. This paradigm holds that Pentecostalism, by insisting that worshippers break with traditional practices and ancestral spirits, introduces a temporal rupture with the past. This is a salutary theoretical move, insofar as it challenges the social scientific tendency to see people as largely reproductive of the past, incapable of discontinuous change. The problem, however, is the implicit assumption that "traditional" cultures--Pentecostalism's contrast class--are static by comparison. My research reveals that the Makhuwa-speaking people of northern Mozambique prove themselves extraordinarily capable of change, and not solely as the result of conversion to Pentecostalism, migration to cities, or other features of African "modernization." This dissertation describes Makhuwa rituals, metaphors, and histories that inculcate dispositions toward mobility and experimentalism. What is significant about these types of change is their banality in everyday affairs. As such, they help mark the Makhuwa "traditional" framework as constitutionally pliable and malleable. Change, even radical change, is endogenous. The new churches' ecstatic dances and spirit baptisms, their theologies of rebirth and renewal, are some of the features that most appeal to those who participate in them. Their appeal, however, is as extensions of, not alternatives to, indigenous ways of being. Yet if the convertibility of the Makhuwa self precedes entry into the churches, brings people into the churches, and finds reinforcement in the churches, it also facilitates exit from the churches. Change is not only incremental and regular, it is also reversible. The reason the churches fail to retain members is not, as their leaders often complain, that people are too rooted in their ancestral ways, but precisely the opposite: they are un-rooted, mobile by tradition.

Cu is one of the most toxic elements that affect fish populations when the fish are exposed to concentrations exceeding their tolerance. To investigate the effects of elementary Cu on aspects of bioconcentration, histology and behaviour, O. mossambicus were exposed to 0 and 0.75 ± 0.20 mg/l of Cu for 96 hours (short-term study), and 0, 0.11 ± 0.02, 0.29 ± 0.02, and 0.47 ± 0.04 mg/l of Cu for 64 days (longterm study) under controlled conditions in the laboratory. For the long-term study fish were sampled for gills, liver, and kidney Cu accumulation analysis after 1, 32 and 64 days of exposure and after 1, 2, 4, 16, 32, and 64 days for gills, liver and spleen histology analysis. Cu accumulation was concentration-duration dependent with the highest accumulation capacity in the liver. A multifactor linear model was developed for the relationship between exposure dose, exposure duration and Cu accumulation in the organs with the liver model: Log L = 3.35 + 0.85W + 0.31T (r² = 0.892) giving a better fit than the gills: G = −35.09 + 10.58W + 17.58T (r² = 0.632). Where L = Cu accumulation values in the liver, G = Cu accumulation values in the gills (both in μg/g dry mass); W = exposure dose in water (mg/l); and T = exposure time (days). Using this model Cu accumulation in organs can be estimated when exposure concentration and duration is known. This model should be tested under different conditions to determine the potential of the model in monitoring Cu toxicity in the environment. Lesions were observed in the liver, gills and spleen in all Cu treatments at all exposure concentration and exposure durations. However, the incidence and the degree of alteration was related to the concentration of Cu and duration of exposure. The sequential appearance of lesions in the order of, hepatic vacuolar degeneration, fatty degeneration and necrosis indicated a gradual increase in liver damage with larger duration of exposure time and increasing Cu concentration. The initial lesions in the gills were manifested as hypertrophy and hyperplasia of the gill epithelium causing increase in the thickness of the secondary lamellae, mucous cell hypertrophy and proliferation, mucous hypersecretion, proliferation of eosinophilic granule cells and hyperplasia of interlamellar cells. With increase in exposure time, necrosis of the eosinophilic granule cells, lamellar oedema, epithelial desquamation and increase in severity of lamellar hyperplasia were observed. These lesions indicated an initial defence mechanism of the fish against Cu toxicity followed by advanced histological changes that were related to Cu concentration and duration of exposure. Changes in the spleen were haemosiderosis, increase in the white pulp and macrophage centres, reduction in the red pulp, and necrosis suggesting that fish exposed to environmentally relevant levels of Cu may be histopathologically altered leading to anaemia and immunosuppression. Regression analysis was used to quantify the relationship between the total activity of the fish, and duration of exposure. There was a gradual decline in fish activity related to Cu concentration and duration of exposure before introducing food into the tanks. There was a constant activity after introducing food in the tanks at the control and 0.11 ± 0.02 mg/l Cu exposure levels irrespective of exposure time. Analysis of covariance (ANCOVA) was used to test for the difference in slopes between treatments. There was no significant difference (p > 0.05) between slopes of the control and 0.11 ± 0.02 mg/l Cu, and between 0.29 ± 0.02 and 47 ± 0.04 mg/l Cu before and after introducing food in the tanks. The slopes of both the control and 0.11 ± 0.02 mg/l Cu were significantly different from those of 0.29 ± 0.02 and 0.47 ± 0.04 mg/l Cu (p < 0.05). There were significant differences in the mean opercular movements per minute between treatments (p < 0.05). There was hyperventilation at 0.11 ± 0.02 mg/l Cu i.e. 87 ± 18 opercular movements per minute (mean ± standard deviation) and hypoventilation at 0.29 ± 0.02 and 0.47 ± 0.04 mg/l Cu i.e. 37 ± 34 and 13 ± 6 opercular movements per minute compared to the control. Hypo- and hyperventilation were related to the lesser and greater gill damage, respectively. In conclusion Cu accumulation and effects on histology of the liver, gills and were related to the concentration of Cu in the water and duration of exposure showing a gradual increase in incidence and intensity with larger duration of exposure time and increasing Cu concentration. The fish were initially able to homeostatically regulate and detoxify Cu. However, as the exposure continued, the homeostatic mechanism appears to have failed to cope with the increasing metal burden causing advanced histological changes.

The objectives of the present research were to study the factors that influence postpartum reproductive characteristics of suckling beef cows in extensive production systems in Mozambique and to develop new management strategies to improve their reproductive efficiency. The effects and interactions between post-partum BW, BCS, age and parity number on plasma concentrations of estradiol, progesterone, creatinine, urea and cortisol around oestrus and the related conception rates of Bos indicus cows in extensive production system were analysed as well as the minimum BCS at the beginning of breeding to maximise the subsequent conception rates. Thirty-five days prior to the breeding season cows were synchronised using Crestar. During the second oestrus after synchronisation, 18 blood samples were collected per animal for hormonal analysis, from 24 hr before oestrus to 24 hr after oestrus. The hormonal pattern of estradiol and progesterone around oestrus were similar to that observed in Bos taurus cows under intensive conditions. Conception rates of cows in the experimental group were 90.5%. Better results on estradiol pattern and conception rates were related to a BCS of ≥ 2.5 and it was thus concluded that the post-partum management of extensive Bos inducus cows should aim to achieve at least a BCS of 2.5 at the beginning of the breeding season. Twelve-hour and 48-hr calf removal were conducted separately to evaluate their effects on conception rates of Bos indicus beef cows in extensive production systems and to quantify the related effects on calf-weaning weights. The 12-hr calf removal was performed from 45 days post-partum to the beginning of the breeding season, and the 48-hr calf removal was performed preceding the onset of the breeding season. It was concluded that 12-hr calf separation at night enhance the energy balance (3%), increases the conception rates (80%) and improves the calf-weaning weights, whereas 48-hr calf removal increases conception rates (76%) and does not affect calf weaning weights. Both calf removal management strategies concentrate conceptions in the early part of the breeding season and stress the importance of the effect of BCS and estradiol on conception rates in Bos indicus beef cows in extensive production systems. / Thesis (PhD)--University of Pretoria, 2012. / Animal and Wildlife Sciences / unrestricted

The study area comprises the Archaean Manica Greenstone Belt and the Vumba Granite Gneiss, the Proterozoic Messica Granite Gneiss of the Zimbabwe Craton, the possibly allochthonous metasedimentary sequence of the Frontier Formation, the granitoids of the Mozambique Metamorphic Province, which are subdivided into Vanduzi Migmatite Gneiss, the Chimoio Granodiorite Gneiss, the Nhansipfe Granitic Orthogneiss and the Pan-African Tchinhadzandze Granodiorite Gneiss. The rock sequences in the two provinces are cut by mafic intrusions. The greenstone belt comprises mafic to ultramafic and pelitic schists and serpentinites of the Macequece Formation and metasediments ofthe M'BezaNengo Formation. The mafic to ultramafic schists and the serpentinites have chemical signatures of komatiites. The Vumba Granite Gneiss comprises the northern and southern Vumba granitoids dated at 3885±255 Ma, and 2527±632 Ma respectively. They vary from metaluminous to peraluminous, have normative QAP compositions of granodiorites and monzogranites and chemical signatures of mantle fractionates and volcanic-arc granitoids. The Early Proterozoic Messica Granite Gneiss is 2348±267 Ma old, is metaluminous and has QAP compositions of monzogranites and chemical signatures suggesting a crustal source and a volcanic-arc environment. The Frontier Formation comprises quartzite and pelitic schists. The Vanduzi Migmatite Gneiss comprises stromatic and stictolithic types. Two mineral assemblages are distinguished as they contain either garnet or hornblende. The Mid-Proterozoic Chimoio Granodioritic Gneiss is 1236±201 Ma old. It is granodioritic and metaluminous with a chemical signature of volcanic-arc granitoids. The Late Proterozoic Nhansipfe Granitic Orthogneiss is dated at 981 ±83 Ma and varies from metaluminous to peraluminous. The Rb, Nb and Y contents are typical of within-plate granitoids, whereas Ga, Zr, AI, Ce andY are typical of A-type granitoids. The age of the mafic intrusions falls between ~500 and ~11 00 Ma. The rocks typically contain plagioclase, hornblende and clinopyroxene with or without garnet and orthopyroxene. The chemistry of the rocks is typical of sub-alkaline tholeiites. The Tchinhadzandze Granodiorite Gneiss may be part of a Pan African event which lasted till ~450-~500 Ma. The normative feldspar compositions and Rb, Ba and Sr contents are typical of granodiorites. It is metaluminous and has Rb, Y and Nb contents typical of volcanic arc granitoids. The planar fabrics in the Archaean granite-greenstone belt are characterized by E-W to SW-NE strikes and steep dips to N and S and to NW and SE. The mineral lineations and fold axes plunge 60° and 30° respectively towards the E. Within the Mozambique belt, around the central part and in the extreme east of the study area, the planar fabrics have essentially N-S strikes and steep dips to E and Win contrast with complex deformation observed in the migmatites and megacrystic granitoids. The study area can be subdivided into three metamorphic blocks, namely, one of low-grade greenschist facies, one of medium-grade amphibolite facies and a third block of high-grade metamorphism. / Dissertation (MSc)--University of Pretoria, 2012. / Geology / unrestricted

Foot-and-mouth disease (FMD) is a viral disease endemic in Africa, the Middle East, South America, Asia and parts of Eastern Europe. It is a major constraint to international trade in livestock and livestock products in many African countries. In southern Africa, African buffaloes (Syncerus caffer) are reservoirs of the South African Territories (SAT) 1, SAT 2 and SAT 3 FMD viruses, and cattle raised in the vicinity of wildlife conservation areas are at constant risk of becoming infected with FMD viruses. In Mozambique, control of FMD is fundamentally based on vaccination of cattle in zones around protected areas. However, the vaccination protocol recommended by the vaccine producer (two primary vaccinations followed by four- to six-monthly boosters) is logistically impractical and financially not suitable for most countries. As a result, the double primary vaccination is usually not implemented. A commercially available bivalent FMD vaccine, containing the SAT 1 and SAT 2 serotypes, was assessed for its ability to induce and sustain immunity in cattle for at least 6 months following a single primary inoculation. The study was conducted with cattle reared in Limpopo National Park (LNP), Mozambique, and adjacent areas. One hundred and seventy five seronegative cattle aged between 6 and 18 months were vaccinated and 42 others from the same areas were left unvaccinated, as controls. A group of 39 vaccinated cattle were revaccinated 4 months after initial vaccination and 63 others were revaccinated 6 months after initial vaccination. The vaccinated and unvaccinated cattle were bled at predefined intervals (at vaccination, and at 1, 4, 5, 6, 8, 10 and 12 months post vaccination) and sera were tested with a liquid phase blocking ELISA to measure the antibody level against FMD virus. A high proportion (73%) of vaccinated cattle had seroconverted (log10 titre ≥1.6 for any SAT serotype) at one month after vaccination with a single primary dose and there was no significant difference between the proportions of animals that seroconverted to SAT 1 compared to SAT 2. A higher proportion of animals within LNP (82%) than outside LNP (50%) had seroconverted at one month after vaccination (P = 0.001). Overall, however, only relatively few animals (27% for SAT 1, 35% for SAT 2 and 7% for SAT 3) had protective antibody titres (log10 titre ≥2). At 4 months after vaccination, a very low proportion (8.3%) of vaccinated cattle had antibody titres ≥1.6 to any of the SAT serotypes, and there was no significant difference between the proportions of animals with antibodies to SAT 1 (2.1%) compared to SAT 2 (7.3%) (P = 0.17). No cattle had a protective titre (≥2) to SAT 1 at 4 months and only 4.2% to SAT 2. The revaccination at 4 months after initial vaccination elicited antibody titres ≥1.6 in 22% of vaccinated animals at one month after revaccination; this rose two months later to 90% and remained high (91%) at 10 months post first vaccination before dropping to 65% at 12 months. However, only 15% of cattle had protective titres (≥2) to any of the SAT serotypes at 12 months. For cattle revaccinated at 6 months after first vaccination the percentage of cattle that had a titre ≥1.6 two months after revaccination was also high (80%), remained high (89%) at 10 months post first vaccination and dropped to 54% at 12 months after first vaccination. Only 11% of cattle had protective titres (≥2) at 12 months. The research findings indicate that, although the vaccine is able to induce production of antibodies against SAT 1 and 2 in a significant percentage of cattle within one month after a single primary vaccination, these antibodies are short lived and have largely disappeared by 4 months post vaccination. This suggests that a protocol of a single primary vaccination is inadequate in naïve animals, even if revaccination takes place four months later. Revaccination improved the immune response for a longer period, resulting in detectible titres in the majority of animals for 6-8 months post revaccination. This can be used in disease control programmes to ensure some protection of cattle particularly when it is applied immediately before identified high risk periods of occurrence of FMD outbreaks. However, it seems unlikely that six-monthly revaccination is sufficient to maintain adequate levels of protective immunity. The study highlighted several difficulties associated with the vaccination of livestock under field conditions and the conduction of field trials. These included difficulties with cold chain maintenance, poor infrastructure for animal handling, and loss of follow-up due to loss of animal identification or poor owner/herder compliance. Copyright / Dissertation (MSc)--University of Pretoria, 2012. / Production Animal Studies / unrestricted

The Ressano Garcia Border Post on the Mozambique side and the Lebombo Border post on the South African side represent the link between two of the three Maputo Corridor countries that receives the largest amount of freight traffic along the Corridor. The link has been identified as a major obstacle to the free movement of goods. As a result the process of the establishment of a One Stop Border Post was mooted by the former president Thabo Mbeki and his counter-part in Mozambique Mr. Joaquim Chissano in a bilateral agreement between these two countries. The reasons for these developments are prompted by the protracted problems that have beset intra-regional trade. For example, transport infrastructure in the region imposes significant costs on intra-regional and regional trade transactions. Long delays at border posts add to the intra-regional trade costs. The requirements by the 1996 SADC trade protocol, the basis of the FTA — that member states eliminate non-tariff barriers — poses special problems as it represents different things to different SADC member states. Addressing the SADC summit on 16 August 2006, the then South African President Thabo Mbeki said “the launch of the FTA was much more than a simple acknowledgement that the majority of traded goods in the region are duty-free. Rather we should view the achievement of this milestone as a major step towards addressing the fundamental challenges of poverty and underdevelopment through deeper integration and economic development” (Mbeki, 2006:16). Now that there will be one centre that clears all the documents for the transporters this will effectively culminate in the speedy processing of the documents. There will be no need for the transporters to stop at the other country’s customs offices to do the same job. Once the documents are complete the process is complete, because the barriers are removed between the two countries.

M.Sc. / The organochlorine insecticides were amongst the first pollutants shown to cause adverse population effects. The potential adverse effects of these pollutants on wildlife are a cause for great concern. Severities of their effects were sometimes surprising given the low levels of the compounds in environmental compartments such as surface waters and soils. High lipophilicity combined with chemical stability and very slow biodegradation are characteristic features of these toxic Persistent Organic Pollutants (POPs). Regional declines in fish, bird as well as invertebrate populations resulting from long term exposure to POPs such as 1,1-bis (4-chlorophenyl) -2,2,2-trichloroethane (DDT) and its stable metabolite 1,1-bis (4-chlorophenyl) -2,2-dichloroethene (DDE), could be related to some biochemical, endocrine and physiological effects in individuals. Some POPs have been suggested to have negative effects disrupting physiological processes and resulting in alterations of homeostasis, reproduction, development and behavior. Such adverse effects upon populations may be avoided if the potential of chemicals to cause them is recognized before problems arise. The aim of this study was to determine whether or not the ongoing spraying of DDT in the Limpopo Province is negatively affecting the health of aquatic species found in surface water of the area. Extensive research has shown that biomarkers have been very effective in the trace determination of a number of adverse effects caused by metals, and thus, are also being used for POPs. A battery of biomarkers (EROD, CAT and CEA) were used, both in the field and in a controlled laboratory environment, in order to try and determine the long term effects of exposure to low environmentally relevant levels of DDE in the selected area. DDT levels in the biota, water and sediment samples were also measured to determine the possible levels of exposure. Dose-response relationships were most successfully determined by the EROD and the CEA biomarkers in this study. In a controlled laboratory study, a definite effect was noted on the Mozambique Tilapia with increasing concentrations of DDE. In the natural environment, dose-response relationships to DDE exposure were more difficult to quantify as additional chemicals and natural environmental stressors also affect the results.

M.Sc. / Heavy metals occur naturally in the environment and are found in varying levels in all ground and surface waters. Some heavy metals are essential elements for the normal metabolism of organisms, while others are non-essential and play no significant biological role. Anthropogenic activities do, however, cause an increased discharge of these metals into natural aquatic ecosystems. Aquatic organisms are exposed to unnaturally high levels of these metals. Fish are relatively sensitive to changes in their surrounding environment. Fish health may therefore reflect and give a good indication of the health status of a specific aquatic ecosystem. Early toxic effects of pollution may only be evident on cellular or tissue level before significant changes can be identified in fish behaviour or external appearance. Histological analysis appears to be a very sensitive parameter and is crucial in determining cellular changes that may occur in target organs, such as the liver. The liver is a detoxification organ and essential for both the metabolism and excretion of toxic substances in the body. Exposure to heavy metals may cause histological changes in the liver. Fish liver histology could therefore serve as a model for studying the interactions between environmental factors and hepatic structures and functions. In this study, the effect of two heavy metals, cadmium (Cd) and zinc (Zn), on the histology of the liver of the South African freshwater fish species, Oreochromis mossambicus, was investigated. The aim of this study was to determine the toxic effect of cadmium and zinc on the histology of the liver, by identifying significant histological changes in the liver tissue, after exposing the fish to two concentrations of a mixture of cadmium and zinc, over both short and long-term exposure periods. Seventy two, adult O. mossambicus specimens were selected for the study. Two experimental exposures were executed under controlled conditions by means of a flow-through system in an environmental room. For each of the two exposures, twenty-four fish were exposed to different concentrations of cadmium and zinc. The remaining twenty-four specimens were used as a control group. The two respective metal concentrations selected for each exposure were 5% and 10% concentrations of both cadmium and zinc calculated from known LC50 values for cadmium chloride and zinc chloride. Liver samples were fixated in 10% neutrally buffered formalin and prepared for light microscopy analysis using standard techniques for Haematoxylin and Eosin (H & E) and Periodic Acid Schiff (PAS) staining. The liver histology of all seventy two specimens - including the forty eight exposed specimens and twenty four control specimens - were analysed, compared and documented. Although histological analysis can provide a clear indication of the degree of damage caused in the tissue(s) or organ(s) of exposed specimens, the need arises to quantify the histological results in studies where the effects of the exposing substance(s) are compared, to illustrate the possible decrease or increase in histological changes over time or the effect of two different concentrations of the same exposure substance on the histology of the liver. The histological results in this study were quantified in terms of a histological index. An index value representing the specific histological characteristics of the liver was assigned to each individual specimen indicating either normal histological structure (index value of 0-2) or a possible pathological response (index value of 3-6). Histological changes were identified in specimens exposed for 12, 18, 24, and 96 hours to both the 5% and 10% concentrations of cadmium and zinc, indicating a toxic response after the short-term metal exposures. Similar histological changes were identified in both the 5% and 10% exposed livers. These histological changes included hyalnization, vacuolation, cellular swelling and congestion of blood vessels. The liver histology of fish exposed over a long-term period of 672 hours, did, however, appear relatively normal in both the 5% and 10% exposure groups, indicating an adaptative, regenerative response. According to the results obtained, it was clear that exposure period did influence the degree of histological changes identified. The two metal concentrations did however seem to have similar histological effects and no definite variation could be identified in terms of 5% and 10% metal concentrations used. It can therefore be concluded that low concentrations of cadmium and zinc exposure caused histological alterations in the livers of exposed specimens and therefore allows the liver of O. mossambicus to be used as a biomarker of prior exposure to cadmium and zinc. / Dr. G.M. Pieterse

Despite many decades of experimentation with supplier-led approaches to credit, limited success has been achieved in improving access to credit for smallholder farmers. In Mozambique, previous attempts by government to improve access to credit for smallholder farmers have not been successful; hence the government is looking for other effective strategies to improve access to credit for smallholder farmers. In the search for effective strategies, Mozambique can draw lessons from the experiences of other developing countries that have succeeded in improving access to credit for smallholder farmers. The purpose of this study is to examine the experiences in other developing countries in Africa and Asia. The results of the analysis are used to identify the most appropriate government intervention strategy to improve access to credit for smallholder farmers in Mozambique. The study addresses the following questions: What went wrong with government strategies implemented in Mozambique in an attempt to improve access to agricultural credit for smallholder farmers? What are the positive experiences with government intervention strategies implemented in other developing countries of Africa and Asia that have resulted in the successful improvement of access to agricultural credit for smallholder farmers? What can Mozambique learn from the countries with good government intervention strategies that have succeeded in resolving or ameliorating the lack of access to agricultural credit for smallholder farmers? What is the most appropriate intervention strategy for the Government of Mozambique that would effectively lead to improving access to credit for smallholder farmers? The study examined four case studies were selected from Botswana, Zimbabwe, Thailand and Indonesia. The data set collection method comprised a combination of primary data collected through in-depth interviews with key informants from smallholder farmers’ associations and government-funded agricultural financial institutions in Botswana, Mozambique and data from Zimbabwe and secondary data sources. The results of the study reveal that the first strategy to improve access to credit for smallholder farmers in Mozambique included the establishment of the People’s Development Bank (BPD), which was given a mandate to provide agricultural credit to smallholder farmers. However, the BPD did not succeed in fulfilling its mandate due to a variety of factors, including the following: poor macro-economic environment during the first decade of independence (1975–1985); lack of human expertise, poor rural infrastructure, market failure problems and the ongoing civil war. The lack of institutional capacity to enforce mechanisms for timely loan repayments, and political interference by government, and lack of credit culture and discipline on the side of the beneficiaries, also led to high loan default rates. The BPD eventually closed down and was privatised to form the new bank (the Austral Bank). The Austral Bank never concerned itself with lending to the smallholder agricultural sector. Other alternative strategies by government in Mozambique included the establishment of the fundos do foment (funds for jump-starting activities), particularly the funds for jump-starting agricultural, hydrological and agricultural development activities. However, both government funds also failed to improve access to credit for smallholder farmers. They are currently experiencing management problems and shortage of funds. The main reasons for their poor performance include lack of qualified managers, skilled field staff and specialists in rural financial markets. The private sector, particularly the concessionary input credit firms, is currently trying to rescue the smallholder farmers by contracting them to engage in cultivating some cash crops. However, many difficulties are experienced, including lack of access to farmer support services (e.g. extension services), due to a complete withdrawal of government support for the concessionary input credit schemes. Thus, smallholder farmers in Mozambique remain marginalised in terms of access to agricultural credit. The results of the study reveal that strategies to improve access to credit for smallholder farmers in Mozambique did not succeed, mainly due to the lack of institutional capacity to enforce mechanisms for timely loan repayments as well as political interference. Lessons drawn from these cases shed light on what the most appropriate intervention strategy for the Government of Mozambique could entail if it is to succeed in improving access to credit for smallholder farmers. The study concludes that lack of access to agricultural credit for smallholder farmers in Mozambique reflects not only market failures in rural financial markets but also inappropriate lending policies. The study concludes that the most appropriate strategy for the Government of Mozambique to succeed in improving access to credit for smallholder farmers should entail the re-establishment of a public rural bank. The study recommends that rural financial institutions should adopt a demand-driven approach, which enables them to design products that fit the needs of a variety of clients. At the same time, reforms at both the fund for jump-starting agricultural activities and the fund for jump-starting hydrological and agricultural development activities need to be undertaken in order for these agricultural development funds to start operating more professionally, with minimum government interference. Finally, the government needs to extend its role to complement efforts by the private sector, particularly the cash crop input schemes. Copyright / Dissertation (MScAgric)--University of Pretoria, 2010. / Agricultural Economics, Extension and Rural Development / unrestricted