A total of 3,760 Ross male broiler chicks were used in two trials, one in the pre-starter (1-11 days) phase and the other in the starter (12-22 days) phase. Birds were distributed in a completely randomized experimental design with a factorial arrangement of 5 digestible lysine levels × 2 environments (clean and dirty environment), with eight replicates per treatment. The following dietary digestible lysine levels used were: 1.06, 1.12, 1.18, 1.24 and 1.30% in the pre-starter phase, and 1.00, 1.06, 1.12, 1.18 and 1.24% in the starter phase. Minimal relation of digestible lysine:digestible methionine + cystine, threonine, tryptophan and arginine (72, 67, 19 and 108%, respectively) were maintained, as well as 2.088 and 2.002% of glycine+serine in the pre-starter and starter diets, respectively. Weight gain, feed intake and feed conversion were evaluated. In all phases, dietary digestible lysine levels significantly influenced broiler performance, and broilers reared in the clean environment presented better performance than those reared in the dirty environment. The recommended digestible lysine levels during the pre-starter and starter phases are 1.30 and 1.24% when broilers are reared in the clean enviroment and 1.26 and 1.165% in the dirty enviroment, respectively.

O experimento foi realizado com objetivo de estudar o uso de mananoligossacarídeos (standard e concentrado) em rações para frangos de corte. Foram utilizados 1.080 pintos de corte machos da marca Ross, com peso médio inicial de 42 g, distribuídos em um delineamento inteiramente ao acaso, com seis tratamentos e nove repetições de 20 aves por unidade experimental. As aves foram criadas em cama de maravalha reaproveitada, utilizada anteriormente por outro lote. Foram testados os tratamentos: testemunha, antibiótico (avilamicina), mananoligossacarídeo alta concentração (MOS AT), mananoligossacarídeo standard (MOS ST), MOS AT + avilamicina e MOS ST + avilamicina para avaliação do ganho de peso, do consumo de ração, da conversão alimentar, da viabilidade e do rendimento de cortes. No período de 1 a 21 dias de idade, não foram encontradas diferenças significativas entre os tratamentos para as variáveis consumo de ração, conversão alimentar e viabilidade econômica. Os resultados de desempenho das aves alimentadas com ração contendo MOS ST ou MOS AT, combinados ou não com o antibiótico, não diferiram dos obtidos nos tratamentos com avilamicina e da ração basal. No período de 1 a 42 dias de idade, a adição de MOS ST, combinado ou não com avilamicina, melhorou o ganho de peso das aves, enquanto o MOS AT afetou de forma negativa o ganho de peso. A conversão alimentar, o consumo de ração e a viabilidade econômica não foram influenciados pelos tratamentos. No entanto, o uso de aditivos em rações para frango de corte melhorou o rendimento de cortes e reduziu a gordura abdominal.

This trial was conducted to study the use of mannanoligosaccharide (standard and concentrate) on chicks diets. One thousand and eigthy 1-d male chicks (Ross) averaging 42 g of initial BW were assigned to a completely randomized experiment with nine replications of 20 birds per experimental unit. The following treatments were analyzed: control, antibiotic (avilamicine), mannaoligosaccharide high concentration (MOS AT), mannaoligosaccharide standard (MOS ST), MOS AT + antibiotic, and MOS ST + antibiotic. The birds were reared in wood powder, reused of a lot previously housed. Weight gain, feed intake, feed:gain ratio, viability and prime cuts yield were evaluated. In the period from 1 to 21 days old, no significant differences across the treatments on feed intake, feed:gain ratio, and viability were found. The results of performance of birds fed diet containing MOS ST or MOS AT combined or not with the antibiotic, did not differ form those of treatments with avilamicin and control. In the period from 1 to 42 days old, mannanoligosaccharides standard (MOS ST) combined or not with avilamicin, increased weight gain, whereas the mannaoligosaccharide high concentration (MOS AT) showed did not affect weight gain. Feed:gain ratio, feed intake and viability were not affected by the different treatments, but the additives increased prime cuts yield and it decreased abdominal fat.

Objetivou-se avaliar os efeitos da adição de complexo multienzimático em dietas à base de soja extrusada submetida a três níveis de processamento sobre o desempenho de frangos de corte de 1 a 21 dias de idade. Foram utilizados 960 pintos de corte machos Avian Farms, em arranjo fatorial 3 x 2 (três dietas à base de soja extrusada subprocessada, normal e superprocessada × dois níveis de adição de complexo multienzimático: 0 e 0,05%), totalizando seis tratamentos com oito repetições de 20 aves por unidade experimental. As dietas foram formuladas para atender às exigências nutricionais das aves, com exceção da proteína bruta, da lisina e da metionina + cistina, que foram fornecidas em níveis subótimos para facilitar a detecção de diferenças no valor nutritivo. Os valores de solubilidade em KOH 0,2% e de urease das diferentes sojas extrusadas foram respectivamente: subporcessada = 91% e 0,5; processamento normal = 88% e 0,05 e superprocessada = 66 e 0,005%. O complexo multienzimático foi composto de celulase, amilase e protease, utilizando-se 500 mL/t. As aves e as rações foram pesadas no início e ao final da fase experimental (1 a 21 dias), para avaliação do ganho de peso, do consumo de ração e da conversão alimentar. A adição do complexo multienzimático em dietas contendo soja extrusada em diferentes níveis de processamento melhorou o ganho de peso em 3,85% e a conversão alimentar em 4,24%, observando-se o maior efeito no desempenho das aves alimentadas com soja extrusada subprocessada, melhorando 4,64% no ganho de peso e 5,0% na conversão alimentar. As aves alimentadas com dietas contendo soja extrusada normal apresentaram desempenho superior ao das alimentadas com soja extrusada sub e superprocessada.

One experiment was conducted to evaluate the effect of the addition of multienzymatic complex in diets with different quality of extruded full fat soybeans on the performance of broiler chicks. A total of 960 Avian Farms male broiler chicks were used from 1 to 21 days of age. The completely randomized experimental design utilized a 3 x 2 factorial treatment structure with three extruded full fat soybeans (under, standard and over processed) and two levels of multienzymatic complex addition (0.0 and 0.05%). Total of six treatments and eight replicates of 20 birds for experimental unit. The diets were formulated to contain corn end extruded full fat soybeans, with crude protein, lysine and methionine+cystine below recommended levels to facilitate detection of nutritional differences. The solubility values in KOH 0.2% and urease of the different extruded full fat soybeans they were respectively: under processed (91% and 0.5), standard (88% and 0.05) and over processed (66% and 0.005%). The multienzymatic complex was composed with celulase, amylase and protease. The birds and ration were weighted in the initial and final experimental phase to get weigh gain, feed intake and feed conversion. The addition of multienzymatic complex in diets contend extruded soybean with different processing improved weight gain in 3.8% and the feed conversion in 4.24%. The largest effect of addition was observed with birds fed under processed soybean, where weight gain and feed conversion improved by 4.64 and 5.0% respectively. Birds fed diets with standard extruded soybean, showed better performance when compared with birds fed with extruded soybean, under and over processed.