ABSTRACT. This study aimed to evaluate the effects of soybean hulls inclusion in the silage of wet brewery waste. The experimental design was randomized in block, where the treatments were constituted by four levels of soybean hulls on the silage (0, 15, 25, and 35%), with three (silos) replicates per treatment. All data collected were subjected to ANOVA and subsequent polynomial regression at 5%. Soybean hulls inclusion caused a linear increase (p < 0.05) in the pH, dry matter, acid detergent fiber, neutral detergent fiber and total carbohydrates content of the silage. This inclusion also caused a significant reduction (p < 0.05) in the effluent losses and percentages of crude protein, fats, hemicellulose, non-fibrous carbohydrates and total digestible nutrients. Thus, it was concluded that soybean hulls can be used as an additive in the silage of wet brewery waste. Up to 35% of inclusion, there was a significant reduction in the effluent losses, a little increase on pH and enrichment of nutritional content, especially in the dry matter.

ABSTRACT. This study aimed to evaluate the use of inoculant on silage of elephant grass, wet brewery waste and buriti meal at different silo opening times. The experimental silage tested was composed of 50% elephant grass, 30% wet brewery waste, and 20% buriti meal. The experimental design was randomized block in a factorial arrangement (2 x 4), where the treatments consisted of the use or not of inoculant during silage processing, and four silo opening times (7, 14, 21, and 28 days). Data collected were firstly subjected to ANOVA and subsequent Tukey’s test. Results were considered significant at p ≤ 0.05. The use of inoculant in silage production provided more acidic pH (p < 0.05) and higher (p < 0.05) effluent losses. Longer silo opening times resulted in more alkaline pH (p < 0.05) and higher (p < 0.05) effluent losses. The use of inoculant in silage production and longer silo opening times provided higher (p < 0.05) content of ash, crude protein, and fats, and lower (p < 0.05) content of dry matter and fiber (neutral and acid detergent). However, there was no interaction between the factors evaluated in this study. It was concluded that the inoculant may be used in the production of elephant grass silages, wet brewery waste, and buriti meal, providing a more acidic pH, higher effluent losses, lower contents of dry matter and fiber, and higher nutritional content. As the opening time was extended up to 28 days, there was more alkaline pH, higher effluent losses, lower dry matter and fiber content, and higher nutritional content.

RESUMO O objetivo desta pesquisa foi avaliar o desempenho produtivo e econômico da inclusão de níveis crescentes (0; 5; 10; 15; 20 e 25%) de farinha do resíduo de buriti (Mauritia flexuosa, Mart) em rações para poedeiras comerciais leves. O experimento teve duração de 84 dias divididos em quatro períodos de 21 dias a partir da utilização de 144 poedeiras Hissex White com 23 semanas. A farinha resíduo de buriti foi inclusa as rações como fonte energética. O delineamento experimental foi inteiramente casualizado constituído de seis tratamentos e quatro repetições de seis aves cada. Os dados coletados foram analisados utilizando regressão polinomial. O consumo acumulado de ração apresentou diferenças significativas (P<0,05) com o nível de 5,74% apresentando maior consumo acumulado e o nível de 4,48% o ponto ótimo econômico para o consumo, havendo uma redução de até R$ 11,26 no custo de produção das rações. O custo alimentar e o custo de produção apresentaram diferenças significativas (P<0,05), verificando relação diretamente proporcional onde à medida que se aumenta os níveis, o custo alimentar aumenta juntamente com o custo de produção. Foram observadas diferenças significativas (P<0,05) para receita bruta e índice de rentabilidade com melhores resultados verificados nos menores níveis de inclusão. A farinha do resíduo de buriti em rações para poedeiras comerciais pode ser utilizada como aditivo sem ocasionar aumento no preço da ração e perdas na receita bruta. Todavia, até 25%, houve aumento no consumo de ração, no custo de produção e queda na rentabilidade.

ABSTRACT The aim of this research was to evaluate the productive and economic performance of the inclusion of increasing levels (0, 5, 10, 15, 20 and 25%) of buriti residue (Mauritia flexuosa, Mart) in the feed of light commercial laying hens. The experiment lasted 84 days, divided into 4 periods of 21 days, and used 144 Hissex White laying hens aged 23 weeks. The buriti residue was included in the feed as an energy source. The experimental design was completely randomised, consisting of six treatments and four replications, each of six birds. The data were analysed using polynomial regression. Cumulative feed consumption showed significant differences (P<0.05), with the level of 5.74% displaying greater accumulated consumption and the level of 4.48%, the economic optimum for consumption, with a reduction of up to BRL 11.26 in the cost of feed production. Feeding costs and the cost of production showed significant differences (P <0.05), demonstrating a directly proportional relationship where, as the levels increase, food costs increase along with production costs. Significant differences (P<0.05) were seen for gross revenue and profitability index, with better results found at the lower inclusion levels. Buriti residue can be used as an additive in feed for commercial laying hens without causing an increase in the price of the feed or loss of gross revenue. However, up to a level of 25%, there was an increase in feed consumption and production costs, and a drop in profitability.