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Fixed transactions costs that prohibit exchange engender bias in supply analysis due to censoring of the sample observations. The associated bias in conventional regression procedures applied to censored data and the construction of robust methods for mitigating bias have been preoccupations of a...


Holloway, G.J.Nicholson, C.Delgado, Christopher L.Staal, Steven J.Ehui, Simeon K.[A revised Tobit procedure for mitigating bias in the presence of non-zero censoring with an application to milk-market participation in the Ethiopian highlands.]A revised Tobit procedure for mitigating bias in the presence of non-zero censoring with an application to milk-market participation in the Ethiopian highlands.

This study investigates the household-level impacts of market-oriented dairy technologies (crossbred cows and complementary feed and management technologies) on in-comes, food and non-food expenditures, nutrient intakes, and health of pre-school children. A recursive econometric model was employe...


Ahmed, M.Ehui, Simeon K.Mohamed-Saleem, M.A.[Adoption of crossbred cow technologies and increased food security among smallholder dairy farmers in the East African highlands]Adoption of crossbred cow technologies and increased food security among smallholder dairy farmers in the East African highlands

Unlike developed countries, where people often eat too many animal products, most of the population of Sub-Saharan Africa eats too little of this type of food for good nutrition. The projected increase in demand for livestock in sub-Saharan Africa will have an important influence on food security...


Ehui, Simeon K.[A review of the contribution of livestock to food security, poverty alleviation and environmental sustainability in sub-Saharan Africa]A review of the contribution of livestock to food security, poverty alleviation and environmental sustainability in sub-Saharan Africa

China's future role in international agricultural trade continues to be a puzzle. Part of this puzzle, namely that related to grains, has received far more attention than has livestock trade, which has been relatively neglected. China is a net exporter of livestock products, although over the las...


Ehui, Simeon K.Hertel, Thomas W.Rae, A.Nin, A.[China: Will they buy or sell?]China: Will they buy or sell?

Per capita consumption of milk and meat products in developing Asia (including China) grew by 2.4 percent and 5 percent respectively between 1975-79 and 1990-94. This growth can be attributed to high growth rate in income and rapid urbanization. For Latin America, per capita milk and meat consump...


Ehui, Simeon K.Li Pun, H.H.Mares, V.Shapiro, Barry I.[The role of livestock in food security and environmental protection]The role of livestock in food security and environmental protection

With a limited number of cash cropping areas, sub-Saharan Africa has the lowest level of mechanization including animal-driven implements and use of tractors. In this paper previous research is reviewed to evaluate the economic and ecological constraints to animal draft cultivation. Results of pa...


Ehui, Simeon K.Polson, R.[A review of the economic and ecological constraints on animal draft cultivation in sub-Saharan Africa]A review of the economic and ecological constraints on animal draft cultivation in sub-Saharan Africa

This paper examines the factors contributing to decline in ownership of various types of livestock and availability and quality of grazing lands in the northern Ethiopian highlands since, 1991. It also examines the factors contributing to changes in utilisation of various feed resources. Increase...


Benin, S.E.Ehui, Simeon K.Pender, J.L.[Policies affecting changes in ownership of livestock and use of feed resources in the highlands of northern Ethiopia]Policies affecting changes in ownership of livestock and use of feed resources in the highlands of northern Ethiopia

Agricultural intensification involving greater crop-livestock interactions and integration is emerging as the most promising strategy for improving agricultural production and productivity in much of sub-Saharan Africa. In West Africa, where this process is at various stages of evolution, 559 far...


Okike, I.Jabbar, M.A.Manyong, Victor M.Smith, Jimmy W.Ehui, Simeon K.[Factors affecting farm-specific production efficiency in the Savanna zones of West Africa]Factors affecting farm-specific production efficiency in the Savanna zones of West Africa

In this paper, we test the hypothesis that land held under varying configurations of property rights will be farmed at different levels of production efficiency. Production data were collected from 477 plots in a fairly productive, mixed farming system in the Ethiopian highlands. Interspatial mea...


Gavian, S.Ehui, Simeon K.[Measuring the production efficiency of alternative land tenure contracts in a mixed crop-livestock system in Ethiopia]Measuring the production efficiency of alternative land tenure contracts in a mixed crop-livestock system in Ethiopia

A two-sector dynamic model for agriculture and forestry is proposed. Agricultural yields are a function of the rate of deforestation, the forest stock, and purchased inputs. We examine the impact of changes in the social discount rate, net returns to agriculture, and direct marginal benefits of t...


Ehui, Simeon K.Hertel, T.W.Preckel, P.V.[Forest resource depletion, soil dynamics, and agricultural productivity in the tropics]Forest resource depletion, soil dynamics, and agricultural productivity in the tropics

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