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Digestible threonine for slow-growing broilers: performance, carcass characteristics, intestinal mucin, and duodenal morphometry
Machado, Noédson de Jesus Beltrão; Lima, Cristina Amorim Ribeiro de; Brasil, Ronner Joaquim Mendonça; Quaresma, Débora Vaccari; Dilelis, Felipe; Silva, Ana Paula Pereira da; Curvello, Fernando Augusto.
Afiliação
  • Machado, Noédson de Jesus Beltrão; Universidade Federal Rural do Rio de Janeiro. Seropédica. BR
  • Lima, Cristina Amorim Ribeiro de; Universidade Federal Rural do Rio de Janeiro. Instituto de Zootecnia. Departamento de Nutrição Animal e Pastagens. Seropédica. BR
  • Brasil, Ronner Joaquim Mendonça; Universidade do Estado do Amazonas. Rede Bionorte. Manaus. BR
  • Quaresma, Débora Vaccari; Universidade Federal Rural do Rio de Janeiro. Seropédica. BR
  • Dilelis, Felipe; Universidade Federal Rural do Rio de Janeiro. Seropédica. BR
  • Silva, Ana Paula Pereira da; Universidade Federal Rural do Rio de Janeiro. Instituto de Zootecnia. Departamento de Nutrição Animal e Pastagens. Seropédica. BR
  • Curvello, Fernando Augusto; Universidade Federal Rural do Rio de Janeiro. Instituto de Zootecnia. Departamento de Nutrição Animal e Pastagens. Seropédica. BR
Rev. Bras. Zootec. (Online) ; 47: e20170193, 2018. tab
Article em En | VETINDEX | ID: biblio-1513200
Biblioteca responsável: BR68.1
ABSTRACT
Five experiments were conducted to estimate the digestible threonine requirements of slow-growing broilers experiment 1, starter phase (days 10 to 28); experiment 2, grower I phase (days 29 to 49); experiment 3, grower II phase (days 50 to 69); experiment 4, finisher phase (days 70 to 84); and experiment 5, which was specifically conducted to determine the production of intestinal mucin over two periods (days 50 to 69 and 70 to 84). Different birds were used in all experiments. A completely randomized design with five treatments and four replicates was used. Treatments consisted of increasing the values of digestible threonine in the diet through basal feed supplementation with L-threonine (98.5%), which was added instead of cornstarch. The following values of digestible threonine were investigated 0.622, 0.697, 0.772, 0.847, and 0.922% in experiment 1; 0.586, 0.662, 0.738, 0.814, and 0.890% in experiment 2; 0.570, 0.640, 0.71, 0.780, and 0.850% in experiments 3 and 5; and 0.520, 0.595, 0.670, 0.745, and 0.820% in experiments 4 and 5. The digestible threonine values presented quadratic effects on feed conversion ratio in experiments 1, 2, and 3. Digestible threonine values of 0.628 and 0.609% resulted in higher villus height and greater duodenal crypt depth, respectively. Digestible threonine values of 0.762, 0.767, and 0.733% may be recommended for the starter, grower I, and grower II phases, respectively, based on the best feed conversion ratio. In addition, a digestible threonine level of 0.694% may be recommended for the finisher phase based on the highest production of intestinal mucin.(AU)
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Texto completo: 1 Base de dados: VETINDEX Assunto principal: Treonina / Galinhas / Carne / Mucinas Limite: Animals Idioma: En Revista: Rev. Bras. Zootec. (Online) Ano de publicação: 2018 Tipo de documento: Article
Texto completo
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Texto completo: 1 Base de dados: VETINDEX Assunto principal: Treonina / Galinhas / Carne / Mucinas Limite: Animals Idioma: En Revista: Rev. Bras. Zootec. (Online) Ano de publicação: 2018 Tipo de documento: Article