Digestible lysine and methionine+cystine requirements of growing broilers

  • Maria José Baptista Barbosa UEM
  • Otto Mack Junqueira UNESP
  • Marcelo de Oliveira Andreotti UNESP
  • Luciana Cardoso Cancherini UNESP

Abstract

An experiment was conducted to evaluate the digestible lysine and methionine+cystine (met+cis) diet requirements for broiler chickens of 22 to 42 day-old, feed rations with 3 lysine levels (0.90; 0.99 and 1.09%) and 3 met+cis levels (0.74; 0.81 and 0.89%). Weight gain (WG) and feed conversion (FC) were better in medium and high levels of lysine. Feed intake (FI) and viability (V) were not affected. The met+cis levels did not affect performance. Best CA interaction occurred in the 2 highest levels of aminoacids. The rate of lysine efficiency was influenced by lysine levels, albeit not by met+cis levels. The rate of methionine efficiency was influenced by lysine and met+cis, with interaction for this parameter. Carcass weight, carcass yield, abdominal fat and chemical composition of the breast meat were not affected by lysine and met+cis. For best performance, the digestible lysine and methionine+cystine levels must be 0.99% and 0.74%, respectively. If focus is on carcass or cut yield, the requirements of digestible lysine and methionine+cystine were 0.90 and 0.74%, respectively.

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Author Biography

Maria José Baptista Barbosa, UEM
Possui graduação em Zootecnia pela Faculdade de Zootecnia de Uberaba (1987), mestrado em Produção Animal Zootecnia pela Universidade Federal de Minas Gerais (1992) e doutorado em Zootecnia pela Universidade Estadual Paulista Júlio de Mesquita Filho (2000). É professor efetivo na Universidade Estadual de Maringá desde 1993. Até 2003 lecionou nos cursos de Zootecnia e Agronomia/ câmpus Sede e a partir de 2003 leciona na Medicina Veterinária e na Agronomia/ câmpus de Umuarama-CAU. Tem experiência na área de Zootecnia, com ênfase em Exigências Nutricionais dos Animais e Avaliação de Alimentos, atuando principalmente nos seguintes temas: frangos de corte e poedeiras comerciais. Currículo Lattes
Published
2008-05-09
How to Cite
Barbosa, M. J. B., Junqueira, O. M., Andreotti, M. de O., & Cancherini, L. C. (2008). Digestible lysine and methionine+cystine requirements of growing broilers. Acta Scientiarum. Animal Sciences, 23, 909-915. https://doi.org/10.4025/actascianimsci.v23i0.2644
Section
Animal Science

0.9
2019CiteScore
 
 
29th percentile
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