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Bahasa Indonesia) 1:
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Feedstuff is an aspect of high economic importance in the rearing of commercial poultry not only because it is primarily responsible for the growth response of birds, but mainly because it represents the largest cost in the production cycle (Ávila et al., 1992). For instance, thebroilers’ energy requirements are responsible for 70% of the cost of the ration (Skinner et al., 1992) and, besides, the processing method and the grain type interfere differently on the economic viability and animal performance. The advantages of using processed feed have been welldocumented, although they represent a high cost for manufacturing. Under natural conditions, birds have to deal with different types of feed, which have different energy and protein levels. Despite domestication and selection for fast growth, broiler chickens did not lose their ability to discriminate different types of diets (Emmans & Kyriazakis, 2001). It has been suggested that the birds associate the feed physical characteristics with nutritional content, which indicates that the contact perception contributes to the identification of the feed.
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