Performance and economic analysis of broilers fed diets containing acerola meal in replacement of corn

It was aimed with this research to evaluate the performance of broiler chickens fed diets containing increasing levels of acerola meal in replacement of corn and analyze the economic viability of that production system. A total of 980 day-old male Cobb chicks were used, allotted in a completely randomized design, with four treatments - inclusion levels (0%, 5%, 10% and 15%) of acerola meal in replacement of corn – and seven replications with 35 birds per experimental unit. The birds were weighed at 21 and 42 days of age to measure the performance data. In the period between 1 and 21 days of age, differences were observed in the feed intake and feed:gain only, in which the inclusion of acerola meal linearly decreased feed intake and improved feed:gain up to a level of 10.25%. For the total rearing period, the control treatment showed higher body weight. The feed:gain showed linear effect, worsening the results with increasing amounts of acerola meal in the diets. In the same period, there was no significant difference in feed intake and productive efficiency index. With regard to the economic analysis, it was found that the lowest final cost per broiler was observed in diets with 10% of acerola meal inclusion in replacement of corn.Objetivou-se com a pesquisa avaliar o desempenho de frangos de corte alimentados com dietas contendo níveis crescentes de inclusão de farelo de acerola em substituição ao milho e analisar a viabilidade econômica desse sistema de produção. Foram utilizados 980 pintos de corte com um dia de idade, machos, da linhagem Cobb, distribuídos num delineamento inteiramente casualizado, com quatro tratamentos - níveis de inclusão (0, 5, 10 e 15%) de farelo de acerola em substituição ao milho - e sete repetições com 35 aves por unidade experimental. Aos 21 e 42 dias de idade as aves foram pesadas para a mensuração dos dados de desempenho. No período de 1 a 21 dias de idade, foram observadas diferenças somente no consumo de ração e na conversão alimentar, onde a inclusão de farelo de acerola diminuiu linearmente o consumo de ração e melhorou a conversão alimentar até o nível de 10,25%. No período total de criação o tratamento controle apresentou maior peso corporal. A conversão alimentar apresentou efeito linear, piorando os resultados com o aumento da quantidade de farelo de acerola nas dietas. Nesse mesmo período, não houve diferença significativa no consumo de ração e no fator de produção. Quanto à análise econômica, verificou-se que o menor custo final por frango foi observado nas dietas com 10% de inclusão de farelo de acerola em substituição ao milho

Performance and economic viability of broiler chicken fed diets with multienzyme complexes

This study evaluated the effect of multienzyme complexes (EC1 and EC2) in low nutritional density diets on performance and economic viability of broilers. A total of 840 day-old chicks were assigned to 7 treatments, distributed in a completely randomized design: (1) PC: positive control, basal diet formulated to meet nutritional requirements; (2) NC1: negative control, reduced energy and nutrient density diet without enzymes; (3) NC1+EC1; (4) NC2: negative control, diet formulated with 7% over-estimated crude protein and amino acids of soybean meal without enzymes; (5) NC2+EC2; (6) NC3: negative control, reduced energy and nutrient density diet and over-estimation of crude protein and amino acids of soybean meal; (7) NC3+EC1+EC2. Feeding NC1 or NC3 impaired feed conversion ratio at 7, 21 and 42 days, and NC2 at 21 days. Inclusion of EC2 in NC2 diet improved feed conversion ratio and kept it similar to basal diets from 1 to 21 days. Association of EC1 with EC2 in NC3 diet did not improve performance. In summary, inclusion of EC2 in diets with reduced nutrient density keep feed conversion ratio similar to basal diets from 1 to 21 days but does not improve performance of broiler chicken from 1 to 42 days post-hatch.

Enriquecimento da dieta do bicho-da-seda com extrato hidrossolúvel de soja Enrichment of the silkworms diet with soybean water soluble extract

O objetivo deste trabalho foi avaliar se a suplementação da dieta do bicho-da-seda com extrato hidrossolúvel de soja (EHS) interfere na produção de casulos e no consumo de folhas de amoreira (Morus alba L.) de diferentes cultivares pelas lagartas. O delineamento experimental utilizado foi o inteiramente casualizado em esquema fatorial 4x5, com quatro cultivares de amoreira ('IZ64', 'IZ56/4', 'FM86' e 'FMSM') e cinco dietas (folhas não tratadas, folhas umedecidas com água, folhas enriquecidas com EHS, em três níveis: suplementação da dieta com 5, 10 e 20% de PB). O EHS foi aspergido sobre as folhas, tendo a água como agente dispersante. O consumo foi verificado pela diferença entre a quantidade de folhas fornecidas e a quantidade não consumida pelas lagartas. A ingestão de alimento apresentou-se de forma quadrática, diminuindo à medida que o EHS foi adicionado à dieta. Houve interação dos fatores cultivar e dieta. O fornecimento de folhas de amoreira com acréscimo proteico de 10% por meio do EHS melhorou a qualidade dos casulos do bicho-da-seda com a utilização das cultivares 'IZ56/4' e 'FMSM'. A pulverização de EHS nas folhas da cultivar 'IZ64' prejudicou a produção de casulos. Lagartas do bicho-da-seda, alimentadas com folhas de amoreira sem suplementação, produziram cascas séricas mais pesadas com folhas das cultivares 'IZ64' e 'FMSM'. A aspersão de água nas folhas incrementou o peso de cascas séricas produzidas a partir da cultivar 'FM86'. A suplementação da dieta com EHS diminui o consumo da lagarta do bicho-da-seda. A aplicação de EHS influencia a produção de casulos em função da cultivar utilizada.<br>The aim of this research was to assess if the supplementation of the silkworm diet with soybean water soluble extract (WSE) interferes on the consumption of mulberry leaves (Morus alba L.) by the caterpillars and on cocoon production. The experimental design was completely randomized in factorial arrangement 4x5, with four mulberry varieties ('IZ64', 'IZ56/4', and 'FMSM' 'FM86') and five diets (untreated control leaves, leaves moistened with water and leaves enriched with WSE, in three levels). The WSE was sprayed on the leaves with water as dispersing agent. The consumption was measured by the difference between the quantity of food provided and the amount that was not consumed by the larvae. The consumption was presented quadratic form, which decreased as the WSE was added on diet. There was interaction between cultivar and diets. Silkworm fed diets containing leaves of mulberry with addition of 10% of crude protein through WSE improved the quality of cocoons with utilization of 'IZ56/4' and 'FMSM' cultivars. The sprayed of WSE on leaves of 'IZ64' cultivar decreased production of cocoons. Silkworm fed with leaves without supplementation produced heavier cocoons shells of the 'IZ64' and 'FMSM' cultivars. Water sprayed on leaves provided higher weight of cocoons shells from 'FM86' cultivar. The WSE supplementation in diets decreases consumption of silkworm. The WSE sprayed influences cocoon production depending on the cultivar