title: A study on the growth curve of and maximum profit from layer-type cockerel chicks.
abstract: 1. 2900 commercial layer-type cockerel chicks were reared on the floor from 1-day-old to 9 weeks of age. 2. The growth curve of the cockerel chicks was [formula see text] 3. The feeding costs (US$) of layer-type cockerel chicks were described by the equation Y = a + bx + cx2 = 0.0657 - 0.0091x + 0.0069x2. 4. When the layer-type cockerel chicks' marketing price was US$0.82 per kg. (6.8 Renminbi per kg), the optimum marketing age for maximum profit margin was 5.9 weeks (41 to 42 d).
authors.affiliation: Poultry and Pig Farm of New Industry Development Co., Shanghai Meishan Metallurgical Corporation, Nanjing City, China.
authors.forename: F Y
authors.initials: FY
authors.lastname: Gang
authors.forename: Y S
authors.initials: YS
authors.lastname: Zhen
mesh_terms: D000822:Animal Husbandry / Q000191:economics*; D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000254:growth & development*; D002681:China; D003362:Cost-Benefit Analysis; D005260:Female; D008297:Male; D010058:Oviposition; D012044:Regression Analysis; D014481:United States