The objective with this study was to evaluate the effect of including dried distillers grains with solubles (DDGS) as a replacement for soybean meal on feed intake, digestibility, and total digestible nutrients (TDN), as well as plasmatic glucose and serum urea concentrations. Fifteen Saanen goats were distributed in a completely randomized design with three treatments and five replicates. Treatments were soybean meal (SBM), SBM+DDGS (12.28% of dry matter [DM]), and DDGS (23.16% of DM), as protein source in diets, common to all corn ground and mineral-vitamin supplement, and corn silage (60% of DM). Response variables were evaluated every 30 d, from 1 to 120 d after parturition. Measurements included body weight, DM intake, DM and nutrient digestibility, and blood samples. Indigestible neutral detergent fiber was used to estimate fecal excretion. There was a difference in neutral detergent fiber intake from 1 to 30 d after parturition. In the four phases of lactation evaluated, there were treatment effects on DM, organic matter, ether extract, and total carbohydrate digestibility, as well as on TDN concentration. Neutral detergent fiber digestibility was affected by treatments, except from d 61 to 90. There was no treatment effect on non-fibrous carbohydrate digestibility, regardless of period. Therefore, SBM+DDGS (12.28% of DM), as protein source on diets may be used in Saanen goat diets from 1 to 120 d of lactation without negative effects on feed intake, digestibility, and plasma glucose and urea concentrations.
Este estudo analisou os efeitos da lisina digestível sobre os parâmetros de desempenho, morfometria e qualidade do músculo do peito (Pectoralis major) de frangos de corte com 21 e 42 dias de idade. Foram realizados dois experimentos em um delineamento inteiramente casualizado, com cinco tratamentos e oito repetições de 30 aves por parcela. As dietas foram formuladas de acordo com as exigências nutricionais para cada fase de desenvolvimento das aves, com diferentes níveis de lisina digestível durante a fase inicial (1 a 21 dias de idade) para o primeiro experimento: 1,12, 1,19, 1,25, 1,31 e 1,37% de lisina digestível e durante a fase final (22 a 42 dias) para o segundo experimento: 0,97, 1,02, 1,08, 1,13 e 1,19% de lisina digestível. Durante a fase inicial, a suplementação de lisina teve um efeito (P 0,05) sobre a morfometria do músculo do peito, rendimento da carcaça, desempenho e qualidade da carne em aves de 22 a 42 dias para os diferentes níveis de lisina. Estes resultados sugerem que o menor nível de lisina testado não apresentou impacto negativo sobre as características analisadas, apesar de estar abaixo dos níveis recomendados. Em conclusão, recomenda-se 1,24% de lisina digestível para o ganho de peso máximo na fase inicial de desenvolvimento de frango de frango (1-21 dias) e 0,97% de lisina digestível é suficiente para atender aos requisitos nutricionais das aves na fase final de criação (22-42 dias) sem comprometer o desempenho.
Context Natural products, organic trace minerals and yeast have been studied for use as alternatives to antibiotics in improving meat quality and acceptability of bulls finished in feedlots. Aims This study was conducted to evaluate acceptability to consumers of meat from feedlot-finished bulls fed diets containing antimicrobials with or without a natural product based on organic trace minerals and live yeast. Methods Crossbred (European × Nellore) bulls (n = 24, age 24 ± 3 months, weight 385.5 ± 3.8 kg) were fed one of four diets: control, without additives; and three diets that included monensin (ionophore, at 30 mg/kg DM intake) alone or with virginiamycin (antibiotic, at 30 mg/kg DM intake) or with a supplement comprising organic minerals and live Saccharomyces cerevisiae (30 g/100 kg bodyweight). Mineral and microbiological analyses of meat were conducted, and consumer perception of the products, including effects of aging and length of display, was measured. Key results No differences in meat mineral levels were found among treatments (P > 0.05). Consumer acceptability was not modified (P > 0.050) by diet with respect to meat odour, flavour, tenderness and overall acceptability. Meat aged for 7 days had higher scores (P < 0.001) than meat aged for 1 day for all studied attributes except odour (P > 0.05). In the first 7 days of display, meat from bulls fed monensin or monensin + supplement blend had the highest visual acceptability scores (P < 0.001). For all diets, visual acceptability decreased with display time after 5 days (P < 0.001). During the first week of display, consumers showed greatest willingness to buy meat from the treatments with monensin or monensin + supplement blend (P < 0.001). Conclusion A combination of monensin and mineral–yeast blend may be beneficial to meat acceptability and shelf life and promote consumer willingness to buy. Implications Combinations of organic mineral and yeast with conventional additives such as monensin are suitable as supplements to increase meat quality of cattle finished in feedlots and fed high-grain diets.
Este trabalho foi realizado para avaliar o efeito da combinação da monensina, virginiamicina e micros minerais + leveduras (Avantage-Confinamento®) sobre o hemograma, estresse oxidativo e atividade antioxidante no plasma sanguíneo, fígado e músculo de bovinos alimentados com dieta alto grão. Um total de 36 touros (Europeu vs. Nelore), com idade média de 24 ± 3,2 meses e peso vivo médio inicial de 385,5 ± 3,84 kg foram distribuídos em um delineamento inteiramente casualizado, com quatro dietas e nove repetições por dieta. A dieta basal foi composta por 850 g/kg de MS de concentrado e 150 g/kg de MS de silagem de milho, fornecida ad libitum por 84 dias. A composição da dieta foi a mesma para todos os animais. As quarto dietas foram: CONT – dieta basal; MONE – dieta basal e inclusão de 30 mg/kg de matéria seca de monensina; MO+VI – dieta basal e inclusão de 30 mg/kg de monensina + 30 mg/kg da matéria seca de virginiamicina; MO+AD – dieta basal e inclusão de 30 mg/kg de monensina + 3,0 g/kg da matéria seca de micros minerais e Saccharomyces cerevisiae (Advantage™ Confinamento). Dentre as variáveis relacionadas ao perfil bioquímico, houve alteração no volume corpuscular médio, creatinina e ureia ao longo dos dias de confinamento. Os parâmetros de avaliação do fígado, avaliado por marcador oxidativo e antioxidante não foram influenciados pelas dietas experimentais. Para os parâmetros de avalição do estado oxidativo na carne, observou-se que inclusão dos aditivos reduziu o dano oxidativo, descarbonilação da proteína muscular, e que os bovinos alimentados com dietas suplementadas com monensina + virginiamicina ou monensina associada com microminerais + leveduras aumentaram a concentração muscular de GSH, em comparação a dieta CONT e MONE.
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