Methods of incorporation of the enzyme phytase in diets for laying hens/ Metodos de incorporacao da enzima fitase em racoes para poedeiras

• Published in: Ciência rural 2012-01, Vol.42 (1), p.160
• Main Authors: Ebling, Patricia Diniz, Zanella, Irineo, Karkow, Ana Katia, Alves, Debora Aline, Santos, Joao Paulo Aquino, Pigozzo, Julio Cesar
• Format: Article
• Language: Spanish
• Subjects: Analysis; Diet; Methods; Phosphates
• ISSN: 0103-8478

The objective of the study to evaluate two methods of incorporation of the enzyme phytase by comparing them to a basal diet and the method of increasing the supplementation of inorganic phosphorus in the diet, in search of a more effective way to mitigate the anti-nutritional factor phytic acid. Were observed performance characteristics of Isa Brown hens for 63 days trial period. The experimental design was completely randomized design with four treatments and five replicates of six birds. The birds received the treatments (diets): basal diet (BD), diet with defatted rice bran treated with phytase (DRBF), the traditional method of incorporation of dietary phytase untreated defatted rice bran phytase (MTF) and diet with defatted rice bran and without phytase (DRB). The methods of incorporating phytase in the diets did not significantly (P>0.05) broiler performance, both equivalent to the basal diet. The treatment of DRBF with phytase at 300 FTU [kg.sup.-1] is effective, ie, treating only one ingredient of the diet with phytase onboard allows a smaller amount of phytase, while maintaining good performance. Therefore, methods involving phytase, regardless of method of incorporation, are indicated in the diet of laying hens. Key words: enzymatic activity, inorganic phosphorus, performance, deffated rice bran. Objetivou-se com o estudo avaliar duas metodologias de incorporacao da enzima fitase comparandoas a uma dieta basal e ao metodo de aumentar a suplementacao de Fosforo inorganico na dieta, em busca de uma forma mais eficaz de atenuar o fator antinutricional acido fitico. Foram observadas caracteristicas de desempenho de poedeiras Isa Brown, durante 63 dias de periodo experimental. O delineamento experimental foi inteiramente casualizado com quatro tratamentos e cinco repeticoes de seis aves. As aves foram submetidas aos tratamentos (dietas): dieta basal (DB), dieta com farelo de arroz desengordurado tratado com fitase (FADFI), metodo tradicional de incorporacao de fitase na dieta sem tratamento previo do farelo de arroz desengordurado com fitase (MTFI) e dieta com farelo de arroz desengordurado e sem fitase (SEMFI). Os metodos de incorporacao da fitase nas racoes nao influenciaram significativamente (P>0,05) o desempenho das aves, ambos equivalendo-se a dieta basal. O tratamento previo do farelo de arroz desengordurado com fitase a nivel de 300 FTU [kg.sup.-1] e eficiente, ou seja, tratar somente um ingrediente da dieta com fitase permite incoporar uma qua