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Environmental impact of replacing soybean meal with common house fly larvae in growing pig diets - Tessa van Maurik

The livestock sector contributes to environmental issues such as climate change, energy use and land use. Livestock feed production is
one of the major contributors. The aim of this study was
to assess the environmental impact of replacing soybean meal with common house fly larvae in growing pig diets.

In 2050 the world population will count 9.7 billion people. Therefore, it is expected that the agricultural production will have to increase with 60%. However, the livestock sector already contributes to environmental issues such as climate change, energy use and land use. Livestock feed production is one of the major contributors. Therefore, there is a need for alternative feed ingredients in order to replace ingredients like fish meal and soybean meal. Insects appeared to have potential in reducing the environmental impact, when fed to livestock. Insects have a low feed conversion ratio, have a high nutritional value, can feed on waste and are not necessarily land intensive.

The aim of this study was to assess the environmental impact of replacing soybean meal with common house fly larvae in growing pig diets. The environmental impact was analysed by using a life cycle assessment. The global warming potential, energy use and land use were calculated per kilogram body weight of growing pig. Results showed that the global warming potential was 1.24 kg CO2-eq, energy use was 11.49 MJ and land use was 1.84 m2. Furthermore, results showed that, expressed per kg of body weight, replacing SBM with house fly larvae meal in growing pig diets decreased global warming potential with 2.4%, decreased land use with 47.6% but increased energy use with 3.1%.

Overall, replacing soybean meal for common house fly larvae appeared to have potential in reducing the environmental impact. However, there is room for improvement in reducing energy use.

Student: FJ van Maurik

Supervisor: H van Zanten, MSc

36 Ects