An experiment was conducted to evaluate the performance and carcass yield of broilers at 55 days of age fed diets with different levels of metabolizable energy and lysine. Evaluated data of performance were weight gain, feed intake, energy intake, lysine intake, caloric conversion and feed conversion. Carcass assessment was performed based on data from carcass yield, breast weight, whole wings, whole legs, back, head + neck, feet and abdominal fat. A 3 x 3 factorial arrangement was used, with 3 levels of metabolizable energy (3,200; 3,400 and 3,600 kcal ME/kg) and 3 lysine levels (0.95%; 1.05% and 1.15%). There was no interaction between the two factors. Nevertheless, increasing levels of metabolizable energy improved weight gain (745 g; 841 g and 910 g, respectively) and feed intake was higher in broilers receiving the diets with 3,200 and 3,600 kcal ME/kg. Overall performance was not affected by lysine levels. Feed conversion values were 2.69, 2.42 and 2.14 for birds fed diets with 3,200; 3,400 and 3,600 kcal ME/kg, respectively. Carcass yield and breast weight increased with higher levels of energy and lysine in the diets.

 RESUMOAvaliou-se o efeito da substituição do milho por farelo de manga em dietas para ovinos. As características avaliadas foram: consumo e digestibilidade aparente da matéria seca (MS), da proteína bruta (PB), da fibra em detergente neutro (FDN), da matéria orgânica (MO), do extrato etéreo (EE), da energia bruta (EB), da energia digestível (ED), dos carboidratos não fibrosos (CNF) e dos carboidratos totais (CT). Vinte e quatro cordeiros Santa Inês foram distribuídos em delineamento inteiramente ao acaso, com quatro tratamentos, constituídos pelas porcentagens de substituição do milho pelo farelo de manga  0, 33, 66 e 100% , com seis repetições. A matéria seca fecal foi estimada utilizando-se o indicador LIPE ® . Não houve efeito da inclusão do farelo de manga sobre o consumo dos nutrientes e nos coeficientes de digestibilidade. Os consumos de EB e ED, em kcal/gMS, aumentaram linearmente com a inclusão do farelo de manga. O farelo de manga pode substituir o milho em dietas para ovinos, sem comprometer o consumo e a digestibilidade dos nutrientes, indicando a possibilidade de uso na dieta desses animais como alimento alternativo.Palavras-chave: fruta, confinamento, consumo, coprodutos, digestibilidade (0, 33, 66 and 100%) with six replicates. The fecal dry matter was estimated using LIPE ® external marker. There is no effect of mango meal inclusion levels on the intake and apparent digestibility. The intakes of GE and DE in kcal/gDM increase linearly with mango meal inclusion. The mango meal can replace corn in diets for lambs without compromising the intake and digestibility of nutrients, indicating potential as an alternative feed. ABSTRACT The effect of replacing corn meal with mango meal in diets of feedlot lambs was evaluated. Apparent digestibility and intakes of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), organic matter (OM) (EE), gross energy (GE), digestible energy (DE), non-fiber carbohydrates (NFC) and total carbohydrates (TC) were evaluated. Twenty-four Santa Inês lambs were distributed in a randomized design with four treatments, consisting of the replacement levels of corn meal by mango

A total of 1.500 male Cobb 500 broilers were used to determine the optimal digestible lysine level for 18 to 40-day-old broilers. The experimental period started when broilers were 18 days old and had an initial average weight of 737 ± 20 g. A completely randomized experimental design was applied, with five lysine levels, totaling five treatments with 10 replicates of 30 birds each. The experimental diets contained equal energy and protein levels, and 0.86, 0.95, 1.04, 1.13, and 1.22% digestible lysine. The following parameters were evaluated: average body weight at 40 days of age, daily weight gain, daily feed intake, feed conversion ratio, carcass yield and parts yield, and abdominal fat percentage. There was a quadratic effect (p<0.05) of digestible lysine levels on average body weight at 40 days of age, daily weight gain, and breast yield, and a cubic effect on feed conversion ratio and abdominal fat. There was no influence of lysine levels of daily feed intake, carcass yield, leg, or wing yields. It was concluded that digestible lysine requirements for male broilers during the evaluated period was 1.22% for performance and 1.04% for carcass yield.

The objective of the study was to evaluate the effects of a heatresistant bacterial phytase added to pelleted diets on mineral digestibility, live performance, carcass traits, and bone quality of broilers. Three treatments were evaluated: Positive control; negative control, with 0.10 points reduction in calcium level and 0.15 points reduction in available phosphorus level; and negative control + phytase at 500 FTU/ kg. Mineral digestibility and bone quality results demonstrated that the evaluated phytase resisted pelleting as it increased the utilization of the minerals present in the diet.

In this study, 600 one-day-old male Cobb 500 broilers were distributed according a completely randomized experimental design into the different dietary treatments. Broilers were fed the following dietary treatments: positive control diet (PC), containing 54 ppm zinc bacitracin; negative control diet (NC), with no inclusion of performance enhancers and 3% reduction in metabolizable energy, crude protein, and amino acid levels; PC up to 33 days and then NC, with the dietary addition of 75, 150, or 225 ppm plant extracts, until day 42 days of age. Broiler performance and carcass yield were evaluated. Data were analyzed using the Statistical Analysis System package (SAS Institute Inc., 2008), and submitted to polynomial regression analysis using the GLM procedure at 5% significance level. There was no influence of treatments on feed intake or weight gain, but feed conversion ratio of the broiler fed the plant extract was significantly higher (p<0.05) compared with those fed the antibiotic. There was no significant effect (p>0.05) of the applied treatments on carcass yield. We concluded that the replacement of performance-enhancing additives by plant extracts, at the evaluated inclusion levels, does not promote positive performance results.