Voluntary food and calcium intake by the laying hen.
D000821:Animal Feed; D000818:Animals; D002136:Calcium, Dietary / Q000008:administration & dosage*; D002645:Chickens / Q000502:physiology*; D002940:Circadian Rhythm; D004435:Eating; D005260:Female; D010125:Ostreidae; D010058:Oviposition; D010060:Ovulation; D013997:Time Factors
D002136:Calcium, Dietary