mannanase and mannan oligosaccharides in broiler chicken feed/[beta]-mananase e mananoligossacarideo em racoes de frangos de corte

• Published in: Ciência rural 2015-01, Vol.45 (1), p.111
• Main Authors: de Barros, Victor Ramos Sales Mendes, Lana, Geraldo Roberto Quintao, Lana, Sandra Roseli Valerio, Lana, Angela Maria Quintao, Cunha, Fabio Sales Albuquerque, Neto, Joao Virginio Emerenciano
• Format: Article
• Language: English
• ISSN: 0103-8478
• DOI: 10.1590/0103-8478cr20131544

The study aimed to evaluate the use of [beta]-mannanase and mannan oligosaccharides (MOS) to replace growth promoters in broiler diets. Four hundred male Cobb broiler chicks were used, with initial weight of 45 [+ or -] 1g, distributed in a completely randomized design with five treatments and eight repetitions of ten birds. The treatments were: basal feed; basal feed without growth promoter; basal feed without growth promoter + [beta]-mannanase; basal feed without growth promoter + MOS; and basal feed without growth promoter + [beta]-mannanase + MOS. The feed intake of the birds increased in response to dietary treatments compared to basal diet during the period 1-21 days of age. A higher weight gain and improved feed conversion was found at 42 days of age among birds that had received the basal diet without growth promoter + MOS. The absolute weight at slaughter, relative carcass and prime cuts except breast weights improved in response to dietary treatments compared to the basal diet at 42 days of age. No difference was observed in relative weight of the liver, while significant differences were found in the weight of heart, gizzard, and abdominal fat. It was concluded that [beta]-mannanase and MOS can replace the growth promoters in broiler diets without compromising production and economic performance. However, the association of these products into the feed may cause negative interaction that reduces the broiler chickens 'performance. Key words: broiler chickens, economic efficiency, exogenous enzymes. O experimento teve como objetivo avaliar a utilizacao de [beta]-mananase e mananoligossacarideos em substituicao aos promotores de crescimento nas racoes para frangos de corte. Foram utilizados 400 pintos de corte machos da marca Cobb, com peso inicial de 45 [+ or -] 1g, distribuidos em delineamento inteiramente ao acaso, com cinco tratamentos e oito repeticoes de 10 aves. Os tratamentos foram: racao basal; racao basal sem promotor de crescimento; racao basal sem promotor de crescimento + [beta]-mananase; racao basal sem promotor de crescimento + MOS; e racao basal sem promotor de crescimento + [beta]-mananase + MOS. O consumo de racao das aves aumentou em resposta aos tratamentos dieteticos, quando comparados a racao basal no periodo de 1 a 21 dias de idade. Observou-se maior ganho de peso e melhora na conversao alimentar das aves aos 42 dias de idade que receberam a dieta basal sem promotor de crescimento + MOS. Os pesos absolutos ao abate e relativo