Avaliação técnica e econômica da matriz nutricional da enzima fitase em rações contendo farelo de girassol para poedeiras comerciais

Abstract

RESUMO -Cento e oitenta poedeiras comerciais Isa Brown, com 60 semanas de idade, foram distribuídas em delineamento inteiramente ao acaso, em esquema fatorial 2 × 2, com dois níveis de fitase (0 e 500 ftu/kg de ração) e dois de farelo de girassol (4 e 8%), totalizando cinco dietas, avaliadas com seis repetições de seis aves. As dietas foram formuladas a partir de uma ração controle, à base de milho e farelo de soja, isenta de fitase e farelo de girassol, valorizando na formulação das dietas a matriz nutricional da fitase. O período experimental foi dividido em quatro ciclos de 28 dias cada. A matriz nutricional preconizada para fitase permitiu o atendimento pleno das exigências das aves, mesmo quando as dietas foram formuladas com níveis nutricionais reduzidos, isso quando desconsiderados os nutrientes presentes na matriz nutricional da enzima, de acordo com recomendação da empresa produtora. A adição de fitase na dieta reduz a excreção de fósforo pelas aves e melhora os parâmetros econômicos. A inclusão de farelo de girassol no nível de 8% prejudica a produção de ovos, mas não afeta os demais parâmetros de desempenho e qualidade dos ovos.Palavras-chave: aditivo, alimentos alternativos, análise econômica Technical and economical evaluation of the nutritional matrix of phytase enzyme diets with sunflower meal for laying hensABSTRACT -One hundred and eighty Isa Brown laying hens at 60 weeks of age were arranged in a completely randomized design in a 2 × 2 factorial scheme, with two levels of phytase (0 and 500 ftu/kg ration) and two levels of sunflower meal (4 and 8%) totalizing five diets, evaluated with six replicates with six birds. Diets were formulated from a control ration based on corn and soybean meal free from phytase and sunflower meal, valuing the nutritional phytase matrix in diets formulation. The experimental period was divided in four 28-day cycles. The nutritional matrix suggested for phytase completely met the requirement by hens, even when diets were formulated with reduced nutritional levels when the nutrients present in the enzyme nutritional matrix were not considered accordingly to recommendations by the manufacturer. Addition of phytase in the diet reduces excretion of phosphorus by the birds and it improves the economical parameters. Inclusion of sunflower meal at 8% level negatively affects egg production, but it does not affect the other performance parameters and egg quality.

Sunflower Meal and Supplementation of an Enzyme Complex in Layer Diets

“…These results are different from the findings of Junqueira et al (2010), who found better efficiency of phytase added to layer diets, as shown by the higher egg mass obtained with 8% sunflower meal inclusion and the addition of phytase in comparison with 4.0% SFM and no phytase inclusion. Bess et al (2006) did not observed any significant differences in the utilization of phytase in broiler breeder diets, using an experimental design very similar to that applied in the present study.…”

“…However, the sunflower meal utilized in the diets were submitted only to partial oil extraction, and therefore nutritional value was much higher than that of the SFM utilized in the present study. Most of the results reported in the literature recommend the utilization of SFM levels close to those included here (Tsuzuki et al, 2003;Casartelli et al, 2006;Rezaei & Hafezian 2007;Junqueira et al, 2010). Feed intake, egg mass, egg weight, and feed conversion ratio per egg mass were not influenced by the treatments (p>0.05; Table 4).…”

“…These results are contradictory A similar situation was also verified by Junqueira et al (2010), who obtained better economic efficiency on diets with 4.0% sunflower meal and the addition of phytase. As it is an alternative feedstuff, its economic efficiency is essentially to its low price relative to typical feedstuffs (corn and soybean meal).…”

“…Additionally, the inclusion of sunflower meal in diets improved eggshell thickness. Recently, Junqueira et al (2010), evaluating the economic viability of the inclusion of enzyme phytase and sunflower meal in layer diets, concluded that the addition of phytase reduced phosphorus excretion and improved the economic parameters. However, the maximum level of sunflower meal inclusion that did not negatively affect productive parameters was 4%.…”

Digestibility, Determination of Metabolizable Energy and Bone Mineralization of Broilers Fed with Nutritionally Valued Phytase

“…The corn feed was used as a performance control and as a comparative effect with sorghum. The valued phytase differs from the non valued phytase because in the first, to achieve the same energy level, the ingredients are altered compared to the control diet (SDP), because the inclusion by the enzyme action is expected, whereas in the second, the enzyme is added without altering the ingredients (Junqueira et al, 2010).…”