The document discusses four key reasons for low levels of investment in livestock funding from major players in the livestock field: 1) Issues in livestock are complex with slow progress and benefits that are difficult to measure, unlike "silver bullet" solutions in other areas. 2) There is a weak evidence base on how livestock benefits smallholders and economic development. 3) Livestock lacks strong advocates to make the case for long-term investment. 4) The sector faces vocal criticism from animal rights, environmental, and health activists based on data of varying quality.