Aditivos (monensina sódica, levedura e probióticos) para bovinos da raça Nelore terminados com rações com concentrado rico em co-produtos / Feed additives (sodium monensin, DFMs and yeast) for feedlot fed Nellore cattle receiving high by-products rations

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Three trials were conducted at the ESALQ/USP Animal Sciences Department experimental feedlot to evaluate the effects of different feed additives in feedlot finished cattle. On trial 1 100 Nellore steers (392kg) were allocated to 20 pens for 60 days. Experimental rations had 41% ground milo, 40% dried citrus pulp and 15% sugarcane silage. Treatments were: (1) control, (2) sodium monensin Rumensin (MON1), (3) sodium monensin Rumenfort (MON2), (4) yeast culture Saccharomyces cerevisiae Yea-Sacc 1026 (LEV1) and (5) yeast culture Saccharomyces cerevisiae Biosaf SC47 (LEV2). DMI was reduced by MON1 trestment (P<0,05) in relation to control. WDG was not affected by treatments (P>0,05). Treatments did not affect FE (P>0,05). Animals on treatment MON2 showed the lowest dressing percentage (DP) and those on MON1 showed the highest rib eye area (REA) (P<0,05). Trial 2 used 96 young Nellore bulls (396kg), allocated to 16 pens for 95 days. Treatments were: (1) control, (2) Saccharomyces cerevisiae Biosaf SC47 (LEV), (3) Saccharomyces cerevisiae and probiotic bacteria mix at 1g /animal/day dose (PROB1) and (4) Saccharomyces cerevisiae probiotic bacteria mix at 3g/animal/day dose (PROB2). Rations contained 59% dried citrus pulp, 35% wet corn gluten feed and 5% Tifton 65 hay. Treatments didnt affect DMI, WDG and FE (P>0,05). Rations net energy for maintenance and gain were also not affect by treatments (P>0,05), well as carcass data. Trial 3 utilized 20 young Nellore bulls allocated to individual pens for 15 days (10 days for adaptation to marker and 5 days for data collection) to evaluate rations digestibility. Experimental ration was the same utilized on trial 2, with chromium oxide as an external marker. Treatments were (1) control, (2) sodium monensin Rumenfort (MON1), (3) yeast culture Saccharomyces cerevisiae Biosaf SC47 (LEV), (4) Saccharomyces cerevisiae and probiotic bacteria mix at 1g /animal/day dose (PROB1) and (5) Saccharomyces cerevisiae probiotic bacteria mix at 3g/animal/day dose (PROB2). Treatments did not affect rations DM, OM, NDF and CP digestibilities (P>0,05). Results show that Nellore cattle, castrated or not, feedlot finished receiving rations with high levels of byproducts such as dried citrus pulp and wet corn gluten feed dont have higher performance nor better nutrients digestibility when supplemented with sodium monensin or probiotic microorganisms.

ASSUNTO(S)

carcass characteristics lactobacillus saccharomyces cerevisiae aditivos alimentares para animal finishing cattle. digestibilidade bifidobacterium bifidum bovinos de corte carcaça - parâmetros digestibility animal performance leveduras subprodutos para animais. lactobacillus acidophilus

ACESSO AO ARTIGO

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