Desempenho de frangos de corte e digestibilidade de rações com sorgo ou milheto e complexo enzimático

Abstract

Resumo -O objetivo deste trabalho foi avaliar a digestibilidade de rações formuladas com sorgo (Sorghum bicolor), ou milheto (Pennisetum glaucum) e adição de um complexo enzimático comercial composto de amilase, carboidrases, proteases e fitase, e o desempenho de frangos de corte. Para avaliação de desempenho, foram alojados 1.800 pintos de corte machos em delineamento em blocos ao acaso, em arranjo fatorial 2x2, com quatro tratamentos (rações com sorgo ou milheto com ou sem adição de complexo enzimático) e cinco repetições com 60 aves por unidade experimental. Nos ensaios de metabolismo realizados dos 10 aos 14 e dos 24 aos 28 dias, foram distribuídos 420 pintos machos em delineamento inteiramente casualizado, em esquema fatorial 2x2 (rações com milheto ou sorgo com ou sem adição de complexo enzimático). Os dados foram submetidos à análise de variância e as médias comparadas com o teste F para contrastes ortogonais. Nas rações elaboradas com sorgo, a adição do complexo enzimático proporcionou melhores coeficientes de digestibilidade da gordura e do nitrogênio. A adição de complexo enzimático em rações formuladas com sorgo melhora a conversão alimentar somente na fase inicial de criação dos frangos, enquanto a adição de complexo enzimático não melhora o desempenho de frango nas rações elaboradas com milheto.Termos para indexação: Pennisetum glaucum, Sorghum bicolor, conversão alimentar, nutrição animal. Broiler performance and digestibility of sorghum or millet diets with enzymatic complexesAbstract -The objective of this work was to evaluate the digestibility of sorghum (Sorghum bicolor) or millet (Pennisetum glaucum) diets with the addition of a commercial enzymatic complex formed by amylase, carbohydrases, proteases and phytase, and broiler performance. For performance evaluation, 1,800 male broilers were distributed in a randomized complete block design in a 2x2 factorial arrangement, with four treatments (sorghum or millet diet with or without addition of enzymatic complex), and five replicates of 60 birds per experimental unit. In the metabolism assays carried out at 10 to 14 and 24 to 28 days, 420 male broilers were distributed in a completely randomized block design in a 2x2 factorial arrangement (millet or sorghum diet with or without addition of enzymatic complex). Data were submitted to variance analysis and averages were compared by the F test for orthogonal contrasts. In diets formulated with sorghum, the addition of the enzymatic complex provided better coefficients of digestibility of fat and nitrogen. The addition of the enzymatic complex in diets formulated with sorghum improves feed conversion ratio only in the initial phase of raising broilers, while the addition of the enzymatic complex does not improve broiler performance in diets formulated with pearl millet.

The effect of dietary phytase on broiler performance and digestive, bone, and blood biochemistry characteristics

“…These results also confirm that the use of enzymes in corn-and soybean meal-based broiler diets promote better performance (p<0.01) by breaking down the antinutritional factors present in the cell wall of plants (Graham et al, 2002), and hence, better nutrient absorption and animal performance (Costa Leite et al, 2011;Powell et al, 2011;Walk et al, 2012).…”

Enzyme Supplementation of Broiler Feeds with Reduced Mineral and Energy Levels

“…Brito et al (2006), using an enzyme complex containing amylase, protease, and xylanase, observed increased weight gain and improved feed conversion ratio in broilers between 1 to 21 days of age, as opposed to the findings of the present experiment. In addition, Leite et al (2011), who evaluated the same enzyme complex as the current study, found better feed conversion ratio 21-d-old broilers.…”

Effect of Combination between Phytase , Xylanase and Protease Enzymes in Different Growing Phases on Growth Performance and Carcass Characteristics of Broiler Chicks.

“…The positive response achieved by phytase, protease and xylanase supplementation during starting phase are agreement with Brito et al, (2006) and Leite et al, (2011) who noted that, adding enzyme complex containing protease, and xylanase increased weight gain and improved FCR in broilers between 1 to 21 days of age. Also, Olukosi et al, (2007) found increase in weight gain, of broiler (1-21 d) fed corn-soybean diet low in energy (-115 kcal),Ca (-0.11%) and available P (-0.10 %) when added mixed enzymes (xylanase, amylase and protease) or phytase enzyme individually or in combination.…”