Utilization of probiótico in diets of broilers chickens: performance, nutrients digestibility and metabolizable energy / Uso de probiótico em rações de frangos de corte: desempenho, digestibilidade e energia metabolizável

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Two trials were conduced at the UFV Animal Science - department of Aviculture, to determine performance, nutrients digestibility and energetic values in poultry feed. Broilers performance, nutrients ileal digestibility and apparent metabolizable energy (AME) and apparent corrected (AMEn) of diets formulated with two levels of energy, supplemented or not with Gallipro probiotic (Bacillus subtilis 8 X 105 UFC/g). At the performance trial, 800 broilers, Ross, 01 to 41 days of age, were randomly distributed in 4 treatments, 8 replicates, 25 birds per replicate. At digestibility trial, 160 broilers were distributed in 4 treatments, 8 replicates, 5 birds per replicate. At both trials, a casual 2 X2 fatorial design was used. The treatments are: T1 (C) = positive control; T2(C + GAL) = T1 + Gallipro ; T3( NC) = Negative Control; T4 (NC + GAL) = T3 + Gallipro . The diets were formulated to anchieve the nutritional levels in each treatment. It was considered the nutritional requirements reported by Rostagno et al. 2005, except for the T3 and T4 that attempt 96% of metabolizable energy (ME) requirement. Suplemented treatments with probiotic received 500g/ ton of Gallipro . The birds were submitted by sanitary challenge at 7, 14, 20, 28 e 35 days of age offering a solution made with used bedding chicken plus water at a 15g/l proportion, throw pressure cup drinkers. The birds were allocated in boxes filled with used wood bedding at non disinfected facilities during all the experimental period. The evaluated performance parameters were: weigh gain (WG), feed intake (FI), feed conversion (FC) and index of productive efficiency (IPE). The results from 1 to 41 days of age, with probiotic supplementation (P<0,05) showed better feed conversion FC (-1,81%) independent of energetic levels, not affecting other evaluated parameters. FI and FC were affected by energy levels of diets with better results at 100% ME in 2,17% and 3,48%, respectively. There wasnt significant interaction between the energetic levels and the addiction or not of probiotic over the studied parameters. At digestibility trial was used the total collection method of excreta and the Ileal collection, using Chromic Oxid as fecal marker. From 21 to 31 days of age, the birds were lodged in batteries, allowing adapting for 5 days. During five days, total collection of excreta was performed. At 31 days of age, all birds were slaughtered to collect the digesta from the terminal ileum. The values of ileal digestibility coefficient of dry matter (DMDC) and of crude protein (CPDC); the values of nitrogen retention (NR), apparent metabolizable energy (AME) and apparent corrected by nitrogen balance (AMEn). The inclusion of Gallipro in the experimental diets improved (P<0,05) CPDC in 3,13%. The energetic values in Gallipro supplemented diets improved (P<0,05), in average, 92 kcal/kg or 2,7 when theyre compared to diets without probiotic inclusion. The Nitrogen retention by the birds fed with Gallipro supplemented diets improved (P<0, 05) in 3,1%. Dry matter ileal digestibility coefficient was not affected by the studied factors. The obtained values of AMEn diets confirmed the differences between the levels of 100% ME and 96%ME. It can be concluded that the inclusion of Gallipro in diets provides a better bird feed conversion and improved the protein diet digestibility, meanwhile the higher energy level provides better birds performance although not influenced the studied digestibility caracteristics.

ASSUNTO(S)

animal nutrition probiotics broilers chickens probiótico alimentação animal frango de corte avaliacao de alimentos para animais

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