{"title":"Why Illumination?","authors":"","doi":"10.3382/ps.0060045","DOIUrl":null,"url":null,"abstract":"<div><p>IT CONTROLS</p><p>I In the tropics where the domestic fowl originated the length of the nights and the days are essentially equal. As a result of this the reproductive and digestive systems of the fowl were developed to fit the environment of the 12-hour night and the 12-hour day.</p><p>T The fowl therefore is like an alarm clock. She must be wound up about every 12 hours. In the winter time in the north her stomach strikes at about 3 to 4 o’clock in the morning. Not having the eyes of an owl to see in the dark she has no alternative but to shiver and wait until daylight or when the caretaker gets around to feed her.</p><p>C Carrying the domestic fowl from the tropics to the north temperate zone where the nights during the fall and winter are from 13 to 15 hours long changed her habits but . . .</p></div>","PeriodicalId":100836,"journal":{"name":"Journal of the American Association of Instructors and Investigators of Poultry Husbandry","volume":"6 6","pages":"Page 45"},"PeriodicalIF":0.0000,"publicationDate":"1920-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3382/ps.0060045","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Association of Instructors and Investigators of Poultry Husbandry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666365119303540","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
IT CONTROLS
I In the tropics where the domestic fowl originated the length of the nights and the days are essentially equal. As a result of this the reproductive and digestive systems of the fowl were developed to fit the environment of the 12-hour night and the 12-hour day.
T The fowl therefore is like an alarm clock. She must be wound up about every 12 hours. In the winter time in the north her stomach strikes at about 3 to 4 o’clock in the morning. Not having the eyes of an owl to see in the dark she has no alternative but to shiver and wait until daylight or when the caretaker gets around to feed her.
C Carrying the domestic fowl from the tropics to the north temperate zone where the nights during the fall and winter are from 13 to 15 hours long changed her habits but . . .
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