... Department of Agricultural, Food and Nutritional Science,University of Alberta, Edmonton, Alberta T6G 2P5, Canada.J.V. Nolan, School of Rural Science and Agriculture, University of NewEngland, Armidale, ... targets of hunters and, eventually, were domesticated and farmed. Today, ruminants account for almost all of the milk and approxi-mately one-third of the meat production worldwide (Food and AgricultureOrganization, ... concepts and language. For example, the terms of animal production such as plane of nutrition and liveweight gain have littlemeaning at the cell or organelle level.Table 1.1. Levels of organization.Level...