Title page for ETD etd-05222006-155537

Type of Document Dissertation
Author Liang, Yan
URN etd-05222006-155537
Title An Ex Ante Analysis of the Effects of Transgenic Rice on Farm Households’ Nutritional Vulnerability in Bangladesh
Degree PhD
Department Agricultural and Applied Economics
Advisory Committee
Advisor Name Title
Norton, George W. Committee Chair
Reaves, Dixie Watts Committee Co-Chair
Ellerbrock, Michael J. Committee Member
Mills, Bradford F. Committee Member
Yang, Dennis T. Committee Member
  • nutritional vulnerability
  • farm household
  • transgenic rice
  • Bangladesh
Date of Defense 2006-05-15
Availability unrestricted
Despite concerted efforts at agricultural development over many years, millions of people in developing countries still suffer from poverty and under-nutrition. New crop varieties, such as those released during the green revolution in Asia, increased farmers’ income and reduced the level of under-nutrition. In recent years, while the speed of the development of conventional breeding technology has slowed, biotechnology has developed rapidly. In 2005, about 8.5 million farmers in 21 countries grew transgenic crops. Transgenic rice has not been commercially released on a large scale, but progress has been made in developing varieties with potential to increase yield and reduce input costs. In this context, this research aims to provide empirical evidence on the potential effects of introducing transgenic rice on farm households’ income and nutritional well-being in Bangladesh—including the impacts on their current nutritional status and nutritional vulnerability over time. To this end, two econometric models are constructed and estimated.

A farm household model is employed to project farm households’ production and consumption responses to introducing improved rice varieties such as transgenic rice. The model estimates the profit effect of introducing transgenic rice. The influence of the profit effect on farmers’ consumption decisions is then considered. Due to the ex ante nature of this research and data limitations, the effects of transgenic rice are assumed to be similar to that of previous high yielding varieties (HYVs), and the impact of transgenic rice on farm household profit is assumed to be similar to the effect of the percentage of rice area in HYVs and the yield effect of transgenic rice is the same as HYVs. On the production side, the supply of three outputs—rice, all other crops and animal products—and demand of labor and fertilizer were estimated. On the consumption side, both poor and non-poor households’ demand for rice, wheat/other food, pulse, oil, vegetables/fruits, meat/egg/ milk, fish, and spices were estimated. Based on the parameter estimates, the calorie intake and protein intake elasticities with respect to introducing transgenic rice were computed. The results indicate that the total profit elasticity with respect to the percentage of rice area in HYVs is 0.08. The calorie elasticity with respect to the percentage of rice area in HYVs ranges from 0.062 in non-poor to 0.074 in poor households, and the protein elasticity ranges from 0.075 in non-poor to 0.084 in poor households. The results indicate that transgenic rice is likely to play a positive role in improving farm households’ nutritional status in terms of total calorie/protein intake. The magnitude, however, is likely to be moderate, if only the profit effect is considered.

A consumption forecasting model is used to examine farmers’ nutritional vulnerability—a probabilistic concept defined as “having a high probability now of suffering a shortfall in the future”. It is assumed that when exposed to risk, farmers’ consumption decisions have already considered their risk coping strategies. The effect of transgenic rice is reflected by its impact on farm income. Farm households’ calorie intake in the future (hunger season) was predicted by a multivariate regression function with the logarithmic daily per resident calorie intake as the dependent variable. The independent variables include variables that represent households’ income, flood exposure, assets, and demographic composition. Farm households’ nutritional vulnerability profiles, based on the estimation of ex ante mean and variance, indicate that vulnerability exists among surveyed rice farm households. The model also predicts that the income increase induced by introducing transgenic rice will reduce each individual household’s probability of suffering a future consumption shortfall and subsequently will reduce its vulnerability. The overall vulnerability profile of farm households improves in Bangladesh.

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