Yeast extract and prebiotic in pre-initial phase diet for broiler chickens raised under different temperatures

Revista Brasileira de Zootecnia

Vanessa Karla Silva²  Janaina Della Torre Da Silva¹  Rodrigo Antonio Gravena¹  Rafael Henrique Marques¹  Fabricio Hirota Hada¹  Vera Maria Barbosa De Moraes¹ 

[1] ,UNESP FCAV Departamento de Morfologia e Fisiologia Animal

关键词: carcass yield;    heat stress;    intestinal morphometry;    mannanoligosaccharides;    performance;    Saccharomyces cervisiae;    desempenho;    estresse calórico;    mananoligossacarídeos;    morfometria intestinal;    rendimento de carcaça;    Saccharomyces cerevisiae;   

DOI  :  10.1590/S1516-35982010000100022

来源: SciELO

【 摘 要 】

The objective of this research was to evaluate the performance, carcass yield and intestinal morphometry of broiler chickens raised under different temperatures that received feed with or without yeast extract and prebiotic in the pre-initial phase. One thousand four hundred and forty one-day old male chicks were used, raised in different climate chambers. Feed with or without the addition of yeast extract and prebiotic was offered only in the pre-initial phase (1 to 7 days). From the eighth day on, every chick received the same feed, readjusted according to usual recommendations. A randomized complete experimental design was used in a 3 × 2 × 2 factorial arrangement, consisting of three environmental temperatures (hot, comfort and cold) and two levels of yeast extract (with or without) and prebiotic (with or without). The performance of the birds was evaluated considering weight gain, feed intake, food conversion and viability at 42 days of age. Carcass yield and intestinal morphometry were also evaluated. Environmental heat impaired performance and carcass yield. Prebiotic inclusion in the pre-initial feed increased weight gain and enhanced food conversion of birds raised under hot conditions. The inclusion of products in the feed of broiler chickens raised in hot and cold environments has beneficial effects on chicken intestinal villi.

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