Sustainable feed formulation (defined here as nutritional and economic feed optimization) is substantial in feed chain production from crop farmers to livestock producers. Diet formulation employing a static linear programming (LP) approach, which is widely used in trading firms and feed production facilities, does not allow for intertemporal flexibility. Our approach allows the interaction between feed components over time, considering the volatile global feed prices, thereby improving sustainability in feed formulation and feed availability. The objectives of this study were to (1) develop a multi-stage LP feed model, (2) demonstrate its potential use in broiler feeding, and (3) illustrate the impact of feed input price spread (variation) on the composition of broiler diets. Modeling resulted in reciprocal relationships between conventional feeds and byproducts at different rates. Based on the price spreads expressed as a percentage of DDGS (distiller’s dried grains with solubles) price compared to corn price, three positions of dietary switch were identified; corn-DDGS price spreads of higher than 94%, between 76 and 94%, and lower than 76% corresponding to limited/no inclusion, partial inclusion, and maximum replacement of corn by DDGS, respectively. Rapeseed meal inclusion was 4, 5, and 6% in the corn-based starter, grower, and finisher diets, respectively, and its potential to replace soybean meal was limited by its higher fiber content. Based on the simulated compound feed prices, the global broiler feed industry could gain 1.7 billion USD through improved resources planning.

Bangladesh, like other South Asian countries, has a dairy system characterized by small-scale operations, integrated with crops and other off-farm activities. Dairying is considered a major source of nutrition and income, and offers good opportunities for both farm families and non-farm rural and urban employment. Consequently, several dairy development programmes and models have been implemented for improving the dairy sector. The gradual shift from subsistence to market-oriented dairy units demands more advanced knowledge and dairy technology. However, adequate information about the dairy sector and its technological advancement is scanty, which increases the need to identify opportunities for technical and institutional development. This paper updates information on key changes in the dairy sector and the characterization of dairy production systems in Bangladesh and considers their implications for South Asian countries. Milk demand, measured by per capita consumption, is increasing by 4% per year, which is higher than the growth in milk production (3.6%). This has led to a continuous widening of the gap between milk supply and demand. Institutional support and policies play a major role in narrowing this gap and should therefore be considered in developing strategies for dairy development.