ラットの摂食リズムに及ぼす飼料カゼインレベル，トリプトファン添加，メラトニン注射および連続暗黒飼育の影響

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  • Effects of Dietary Casein Content, L-Tryptophan Supplementation, Melatonin Injection and Continuous Darkness on the Diurnal Food Intake Rhythm of Male Rat
  • ラット ノ セッショク リズム ニ オヨボス シリョウ カゼインレベル トリプ

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Effects of dietary casein content, L-tryptophan supplementation, melatonin injection and continuous darkness on the diurnal food intake pattern of male rats were investigated. The results were as follows:<br>1) Male rats of 6 weeks of age kept under regular light-dark cycle (light from 0700 A. M. to 0700 P. M.) and served 9 or 27% casein diets took 80-90% of the 24hr. food consumption in the dark as determined at every 4hr. intervals.<br>2) Proportion of the food consumption during the dark period or the corresponding time period of continuous darkness group to the 24hr. food consumption showed no difference between the animals fed 9 and 27% of casein diets. But, maximum food intake appeared earlier in the 27% casein diet group than the 9% group.<br>3) The rats kept under continuous darkness for 20 days showed a diurnal food intake rhythm clearly but the proportion of the food consumption during 0700 P. M. to 0700 A. M. was lower than that of the regular light-dark cycle group. This tendency appeared to be more clear in young rats (6 weeks of age) than adult (6 months of age) ones.<br>4) Melatonin injections (500μg/rat/day s. c.) to the rats served 9 or 27% casein diets for 20 days gave no effect on the diurnal food intake rhythm.<br>5) The addition of 0.2% L-tryptophan to the 9 or 27% casein diets also gave no effect on the feeding pattern of rats served the diets for 20 days.

収録刊行物

  • 栄養学雑誌

    栄養学雑誌 35 (4), 183-192, 1977

    特定非営利活動法人 日本栄養改善学会

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