[in Japanese]

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Four experiments were conducted to study the effects of light, dark and feeding method on ruminating and masticating circadian rhythm in goats. Three female goats were used in four experiments: continuous feeding (Exp.1-cf) and once daily feeding (Exp.1-of) in light, and continuous feeding (Exp.2-cf) and once daily feeding (Exp.2-of) in dark. The pattern of feed intake and water intake were as same as masticat.inq behaviour, but excretions of feces and urine were almost constant for 24 hours in all experiments. Ruminating and masticating circadian rhythms under continuous lightt or dark were different between once daily feeding and continuous feeding, but the frequency of ruminating and masticating behaviour for 24 hours was almost the similar in four experiments. The checks of ruminating behaviour were observed for an hour after feeding at 12: 00 in Exp.1-of and the checks of rumination for three hours from 11: 00 to 14: 00 before, during and after feeding at 12: 00 in Exp.2-of. The effect of feeding on ruminating behaviour was higher in Exp.2-of (dark) than in Exp.1-of (light), On the other hand, ruminating and masticating behaviour in both of Exps.1-of and 2-of showed constant for 24 hours. Although remasticating behaviour per a rumination and remasticating rate were in a steady state for 24 hours in Exps.1-cf, 1-of, 2-cf and 2-of, the experiments indicated that ruminating behaviour with regard to ruminating time, remasticating time, intermittent time between remastications and remastication per a rumination were higher in values on once daily feeding than on continuous feeding in Exps.1 and 2. These experiments have demonstrated that light, dark and feeding method were important to determine ruminating and masticating circadian rhythm. Therefore, although ruminating center was activated by dark condition, it was also controlled more by feeding under dark than light.

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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