Efeito da adição de probióticos na dieta sobre digestibilidade ileal da materia seca e da proteína de frangos de corte

O experimento foi realizado no Departamento de Zootecnia da Universidade Federal de Viçosa a fim de avaliar o efeito da adição de probióticos sobre a digestibilidade ileal em dietas de frangos de corte. Foram utilizados 400 pintos de corte machos, Cobb 500, de 21 a 31 dias de idade, distribuídos em um delineamento experimental em blocos casualizados, contendo 10 tratamentos em esquema fatorial 5 x 2 (Sem probiótico, com antibiótico e com cepas e concentrações diferentes de Bacillus subtilis) e dois níveis de energia metabolizável: Normal e -100 kcal), com 8 repetições de 5 aves por unidade experimental. Nas três primeiras semanas de vida, com o objetivo de aumentar o desafio sanitário as aves receberam, duas vezes por semana, uma solução de cama reutilizada e água na proporção de 25 g/l durante 8 horas. A adição dos promotores de crescimen- to acarretou incremento na digestibilidade ileal da matéria seca em média de 6,79 % (67,56 % vs 63,26 %) e aumento da digestibilidade da proteína bruta em 3,64 % (79,45 % vs 76,66 %) sobre a dieta sem o aditivo. A adição de probiótico a base de Bacillus subtilis ou do antibiótico bacitracina metileno dissalicilato nas dietas de frangos de corte em condições de desafio sanitário é eficiente na melhora dos coeficientes de digestibilidade da materia seca e da proteína bruta.The experiment was conducted at Department of Animal Science, Federal University of Viçosa to evaluate the effect of adding probiotics on ileal digestibility in diets for broilers. Four hundred male chicks Cobb 500, between 21-31d of age, were distributed in a ran- domized complete block design with 10 treatments in a factorial 5 x 2 (No probiotic, with antibiotic and with different strains and concentrations of Bacillus subtilis; and two levels of metabolizable energy: Normal and -100 kcal), with 8 replicates of 5 birds each. In the first three weeks of life, with the goal of increasing the health challenge of the birds received twice a week, a solution of reused litter and water in the ratio of 25 g/l for 8 hours. The addition of growth promoters resulted in increased ileal digestibility of dry matter avera- ged 6.79 % (67.56 % vs 63.26 %) and increased digestibility of crude protein in 3.64 % (79.45 % vs 76.66 %) on diet without the additive. The addition of probiotics based on Ba- cillus subtilis or antibiotic bacitracin methylene or dissalicilato in the diets of broilers in terms of health challenge is efficient to improve the digestibility of dry matter and crude protein

Standardized ileal amino acid digestibility of plant-based feedstuffs and phytase supplementation in broiler chicken diets

ABSTRACT The objective was to determine the standardized ileal amino acid digestibility (SIAAD) in soybean meal (SBM), corn + SBM, wheat + SBM and a protein free diet (PFD) associated with phytase. A total of 672 Cobb 500 (493±10g) male chicks were distributed in a completely randomized design with twelve treatments (PFD, PFD + SBM, PFD + corn + SBM and PFD + wheat + SBM, supplemented with 0, 500 and 1000 FTU), eight replicates and seven birds per cage from 14 to 23 days. Phytase supplementation at 500 FTU increased the SIAAD of methionine in SBM (P&lt;0.05) and threonine in corn + SBM (P&lt;0.05). There was no significant effect (P&gt;0.05) for the SIAAD of methionine, arginine and histidine in wheat + SBM as the phytase supplementation. However, the SIAAD of lysine, threonine, isoleucine, phenylalanine, valine, cystine, alanine, aspartic acid, glutamic acid, glycine, serine and tyrosine differed (P&lt;0.05). In general, the SIAAD for SBM, corn + SBM and wheat + SBM are 90.32, 88.65 and 83.97% (0 FTU); 91.31, 88.81 and 88.36% (500 FTU); and 91.36, 87.09 and 87.87% (1000 FTU). In conclusion, the efficacy of phytase for improve the SIAAD vary according to the feedstuff and level of supplementation.</jats:p