Abstract. ‘Many of us are demanding higher standards for how our meat is produced, with animal welfare and the impact on the environment factoring now in many purchases. Unfortunately, many widely-used livestock production methods are currently unsustainable. However, new research published by the University of Cambridge has identified what may be the future of sustainable livestock production: silvo-pastoral systems, in which shrubs and trees with edible leaves or fruits are grown as well as herbage. Professor Donald Broom, from the University of Cambridge, who led the research said: “Consumers are now demanding more sustainable and ethically sourced food, including production without negative impacts on animal welfare, the environment and the livelihood of poor producers. Silvo-pastoral systems address all of these concerns with the added benefit of increased production in the long term.”
Current cattle production mostly occurs on pastures with solely herbaceous plants, such as grasses, grown as food for the cows. The effects on the local environment of the removal of trees and shrubs and the increased use of herbicides, all result in a dramatic decrease in biodiversity. Additionally, there is also contamination of soil and waterways by agricultural chemicals as well as carbon costs because of the oil-based fuel and artificial fertilisers necessary to maintain the pasture. The researchers advocate that using a diverse group of edible plants such as that in a silvo-pastural landscape promotes healthy soil with better water retention (and less runoff), encourages predators of harmful animals, minimizes greenhouse gas emissions, improves job satisfaction for farm workers, reduces injury and stress in animals, improves welfare and encourages biodiversity using native shrubs and trees.
Additionally, shrubs and trees with edible leaves and shoots, along with pasture plants, produce more food for animals per unit area of land than pasture plants alone. Trees and shrubs have the added benefit of providing shade from hot sun and shelter from rain, important with a warming climate. “The planting as forage plants of both shrubs and trees whose leaves and small branches can be consumed by farmed animals can transform the prospects of obtaining sustainable animal production,” said Professor Broom. “Such planting of ‘fodder trees’ has already been successful in several countries, which is now widely used for cattle feed in Australia.”
One of the additional benefits of using the silvo-pastoral system is that it increases biodiversity. Biodiversity is declining across the globe, and the main culprit is farming; 33% of the total land surface of the world is used for livestock production. If farmers were to switch to sustainable livestock production methods, such as the silvo-pastoral system, the result would be much greater biodiversity with no increase in land use. Professor Broom added: “It is clear that silvo-pastoral systems increase biodiversity, improve animal welfare and provide good working conditions while enabling a profitable farming business. The next step is to get farmers to adopt this proven, sustainable model.” ‘
The paper ‘Sustainable, efficient livestock production with high biodiversity and good welfare for animals’ was published in the 25 September 2013 edition of Proceedings of the Royal Society (Biological Sciences).