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Kenya is recognized among developing countries for its success in integrating dairy into smallholder farming systems, particularly in the highland areas. The major determinants of this success were colonial history, its favourable agroecology and supportive agricultural policies, and the importance of milk in rural and urban diets. In response to agricultural policies, market opportunities and human population pressure on land, smallholders have changed their farming systems by introducing the Friesian and Ayrshire breeds, keeping smaller herds with fewer heifers but more cows, increasing stocking rates through stall-feeding, growing fodder, purchasing feeds and becoming more dependent on external inputs and services. As a result, they can sell more milk. This increasing intensification, here defined as the use of external inputs and services to increase the output quantity and/or value per unit input, has ensured that more people are maintained per unit of land through increased returns per ha of family land. Because the level of intensification varies with the agroecological potential for cropping and dairying and with the level of milk market access and household resources, recommendations for production practices supporting intensification will be site-specific. Identifying appropriate recommendations will require a thorough understanding of farmers' objectives for keeping cattle.

Although conceptually simple and often idealized, disentangling crop-livestock interactions typically proves more complex in practice. Part of the complexity arises from their changing nature along agricultural intensification gradients. Such interactions increase in scope when extensive systems intensify, but decline in importance as already intermediate systems intensify further. This changing nature of crop-livestock interactions in relation to the system's developmental stage implies that these exchanges can both contribute but also undermine system sustainability. We examine crop-livestock interactions in the Indo-Gangetic Plains as an empirical case, drawing from village surveys to explore and illustrate these relations and implications along the agro-ecological gradient of this vast and important eco-region. Such an understanding is increasingly needed as adapting crop residue management practices is recognized as the key to address sustainability concerns in the prevailing rice-wheat systems and as a stepping stone towards conservation agriculture. The agricultural R&D community needs to incorporate this understanding more proactively into its R&D agenda if it is to succeed in sustaining productivity gains, improving rural livelihoods equitably, and securing environmental sustainability.

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