Effect of phytase supplementation on performance, bone densitometry and carcass yield in broilers chicks

Efeito da adição da enzima fitase sobre o desempenho, densitometria óssea e rendimento de carcaça de frangos de corte

Effect of phytase supplementation on performance, bone densitometry and carcass yield in broilers chicks

Efeito da adição da enzima fitase sobre o desempenho, densitometria óssea e rendimento de carcaça de frangos de corte

Otto Mack Junqueira^I; Karina Ferreira DuarteI^*; Vinícius Assuena^I; Rosemeire da Silva Filardi^II; Antonio Carlos de Laurentiz^II; Maria Fernanda Ferreira Menegucci Praes^I

^IDepartamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista "Júlio de Mesquita Filho", Via de Acesso Prof. Paulo Donato Castellane, 14884-900, Jaboticabal, São Paulo, Brazil.

IIDepartamento de Biologia, Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista "Júlio de Mesquita Filho", Ilha Solteira, São Paulo, Brazil.

^{Correspondence to}

ABSTRACT

An experiment was conducted to evaluate the performance, bone densitometry and carcass yield of broilers chicks, using different levels of phytase enzyme. Nine hundred and sixty male one-day-old broiler chicks were used. The birds were distributed in a completely randomized experimental design, involving five treatments and six replications of 32 chicks each. The treatments consisted of a control diet for each phase, and four other diets were formulated adding growing levels of the phytase enzyme (250, 500, 750 and 1,000 FTU of phytase kg^-1 feed). When adding the phytase enzyme, the nutritional matrix was valued to guarantee the same nutritional levels as the control diet. In general, the addition of phytase enzyme determined a linear decrease on the performance of the birds. However, the performance obtained with the level of 250 FTU phytase kg^-1 feed were no different from the control treatment. The best bone density results were observed in the control treatment with no phytase, and the highest leg and thigh yield were obtained at the level of 514 FTU phytase kg^-1.

Keywords: bone characteristics, carcass yield, performance, phytase enzyme.

RESUMO

Um experimento foi realizado com o objetivo de avaliar a inclusão de diferentes níveis da enzima fitase, sobre o desempenho, a densitometria óssea e o rendimento de carcaça e partes de frangos de corte nas diferentes fases de criação. Foram utilizados 960 pintainhos de corte com um dia de idade, da marca comercial Ross, distribuídos em um delineamento inteiramente casualizado, com quatro tratamentos mais uma testemunha (quatro níveis da enzima fitase - 250, 500, 750 e 1.000 FTU de fitase kg^-1 de ração + testemunha) e seis repetições de 32 aves cada. Ao adicionar a enzima fitase, a matriz nutricional da mesma foi valorizada para garantir os mesmos níveis nutricionais da dieta testemunha. Foram avaliados os índices de desempenho, de densitometria óssea e o rendimento de carcaça e de partes nas diferentes fases de criação. De maneira geral o aumento na inclusão da enzima fitase determinou declínio linear sobre o desempenho das aves. Entretanto, até o nível de 250 FTU de fitase kg^-1 de ração não foram observadas diferenças expressivas em relação ao tratamento isento de fitase. Os melhores resultados de densitometria óssea foram observados no tratamento controle sem a adição da enzima fitase e o maior rendimento de coxa+sobrecoxa foi obtido com o nível de 514 FTU de fitase kg^-1 de ração.

Palavras-chave: características ósseas, desempenho, enzima fitase, rendimento de carcaça.

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*Author for correspondence

Received on July 21, 2010.

Accepted on January 25, 2011.

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¹

Natuphos

^® 10000: commercial brand of the company BASF S/A: Estr. Samuel Aizemberg, 1707 - Bloco C - 2. Andar, São Bernardo do Campo, São Paulo, CEP 09851-550.

Publication Dates

• Publication in this collection
  22 Apr 2014
• Date of issue
  Sept 2011

History

• Accepted
  25 Jan 2011
• Received
  21 July 2010