Feeder Color and Feeder Position Act As a Cue to Discriminate between Two Diets in Choice Feeding of Chicks

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Chicks were offered a choice between diets added with or without quinine hydro-chloride (HCl) to elucidate the role and efficacy of feeder color (gray or orange) or feeder position (fix or change) in the two-choice preference test. In the first experiment, chicks were given a choice between a basal diet and a diet containing 0.4% quinine HCl by two feeders with different colors for 24h. They had a strong aversion to the quinine- added diet, regardless of fix or change of feeder positions. After replacing the quinine-added diet by the basal diet next morning, chicks initially avoided to eat the diet from feeders previously delivering the quinine-added diet. However, they consumed the diet from both feeders with time. From these results, it was shown that chicks were able to differentiate between the gray and orange feeders, and associated these colors with the diet contained in each feeder. At the same time, chicks occasionally sampled the diet in the other feeders. Feeder color itself had little effect on feed intake when the basal diet was given by two feeders. In the next experiment, supplemental level of quinine HCl was reduced to 0.2%. As a result, the individual differences in sensitivity to quinine became apparent. Some chicks had an aversion to the quinine-added diet from the first 2h, but others not. The aversion to quinine became evident, especially in the latter chicks when feeders with different colors were used or feeder positions were fixed. Therefore, feeder color or feeder position acts as a cue in the choice feeding and it is effective in minimizing the individual differences among choice-fed chicks.

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