African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6849

Full Length Research Paper

The influence of essential amino acid in the chick’s diet interferes in the weight gain

Aurelio Ferreira Borges
  • Aurelio Ferreira Borges
  • Department of Animal Nutrition, Federal Institute of Education in Rondonia State, Brazil.
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Maria dos Anjos Cunha Silva Borges
  • Maria dos Anjos Cunha Silva Borges
  • Department of Education, Technological University of Ipe in Mato Grosso State, Brazil.
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  •  Received: 15 July 2018
  •  Accepted: 07 September 2018
  •  Published: 25 October 2018


One of the attributes of amino acid lysine is to manufacture muscle protein, as it is a physiologically essential amino acid for immunity, development and production in birds. This study evaluates the influence of several levels of the essential amino acid lysine for chicks, with age of about 504 hours, maintained at a temperature of approximately 29 degrees Celsius. The basal diet contained 21.0% crude protein and 3,000 kcal of energy of biological transformations/kg. This formula was supplemented with levorotatory-lysine acid monohydrochloride, resulting in diets with 1.040 to 1.280% of total lysine for five experimental treatments. The treatments were found to have a mathematical expression squared influence on animals’ weight gain, conversion of diet, total liver mass and protein synthesis index. The effect of the five experimental treatments was not observed in diet consumption, fat synthesis index, absolute weights of intestines and heart, and percentage of liver mass. It was concluded that the total lysine requirements for chicks aged up to 504 h were 1.240%.

Key words: Thermal environment, dietary lysine, growth performance, rearing setting.