Avaliação de probiótico na alimentação de poedeiras comerciais no segundo ciclo de postura

Avaliou-se o efeito da inclusão de probiótico sobre o desempenho e a qualidade dos ovos de poedeiras semipesadas no segundo ciclo de postura. Foram utilizadas 450 aves com 69 semanas de idade, distribuídas aleatoriamente em um delineamento inteiramente ao acaso, em cinco tratamentos, seis repetições e 15 aves por unidade experimental. A ração experimental foi à base de milho e farelo de soja e suplementada com probiótico composto por Lactobacillus acidophilus, Streptococcus faecium e Bifidobacterium bifidum. O experimento teve a duração de 16 semanas e foi dividido em quatro períodos de 28 dias cada, nos quais as aves receberam cinco rações experimentais contendo diferentes porcentagens de inclusão de probiótico, 0; 0,05; 0,10; 0,15 e 0,20%. Não foi observado efeito (P>0,05) da inclusão de probiótico sobre o desempenho e a qualidade dos ovos de galinhas poedeiras no segundo ciclo de postura. A inclusão de 0,10% de probiótico influenciou negativamente a gravidade específica dos ovos. A utilização de probiótico para galinhas no segundo ciclo de postura não interfere na produção e na qualidade dos ovos

Avaliação de probiótico na alimentação de poedeiras comerciais no segundo ciclo de postura Evaluation of probiotics in feed for laying hens in the second cycle stance

Avaliou-se o efeito da inclusão de probiótico sobre o desempenho e a qualidade dos ovos de poedeiras semipesadas no segundo ciclo de postura. Foram utilizadas 450 aves com 69 semanas de idade, distribuídas aleatoriamente em um delineamento inteiramente ao acaso, em cinco tratamentos, seis repetições e 15 aves por unidade experimental. A ração experimental foi à base de milho e farelo de soja e suplementada com probiótico composto por Lactobacillus acidophilus, Streptococcus faecium e Bifidobacterium bifidum. O experimento teve a duração de 16 semanas e foi dividido em quatro períodos de 28 dias cada, nos quais as aves receberam cinco rações experimentais contendo diferentes porcentagens de inclusão de probiótico, 0; 0,05; 0,10; 0,15 e 0,20%. Não foi observado efeito (P>0,05) da inclusão de probiótico sobre o desempenho e a qualidade dos ovos de galinhas poedeiras no segundo ciclo de postura. A inclusão de 0,10% de probiótico influenciou negativamente a gravidade específica dos ovos. A utilização de probiótico para galinhas no segundo ciclo de postura não interfere na produção e na qualidade dos ovos.Evaluating the effect of the inclusion of probiotic on the performance and egg quality of laying hens in the second laying cycle, 450 birds were used at 69 weeks of age, distributed in a completely randomized design, in five treatments, six replicates and 15 poultries per experimental unit. The experimental diets were based on corn and soybean meal and supplemented with increasing levels of probiotic consisting of Lactobacillus acidophilus, Streptococcus faecium, and Bifidobacterium bifidum. The experiment lasted 16 weeks, divided into four periods of 28 days each, in which the birds were fed five experimental diets containing different percentages of probiotic inclusion, 0; 0.05; 0.10; 0.15 and 0.20%, in the period from 69 to 85 weeks of age. There was no effect (P> 0.05) of the inclusion of probiotic on performance and egg quality of laying hens in the second laying cycle. The inclusion of 0.10% of probiotic negatively influenced the specific gravity of eggs. The probiotic used for laying hens in the second cycle does not interfere in production and egg quality

The effect of operational conditions on the performance of UASB reactors for domestic wastewater treatment

In this investigation, the performance of Upflow Anaerobic Sludge Blanket (UASB) reactors treating municipal wastewater was evaluated on the basis of: (i) COD removal efficiency, (ii) effluent variability, and (iii) pH stability. The experiments were performed using 8 pilot-scale UASB reactors (120 L) from which some of them were operated with different influent COD (CODInf ranging from 92 to 816 mg/L) and some at different hydraulic retention time (HRT ranging from 1 to 6 h). The results show that decreasing the CODInf1 or lowering the HRT, leads to decreased efficiencies and increased effluent variability. During this experiment, the reactors could treat efficiently sewage with concentration as low as 200 mg COD/L. They could also be operated satisfactorily at an HRT as low as 2 hours, without problems of operational stability. The maximum COD removal efficiency can be achieved at CODInf exceeding 300 mg/L and HRT of 6 h

Influence of a probiotic on broiler performance

The objective of the present study was to evaluate the influence of a probiotic product (composition: Lactobacillus acidophillus (3.5 × 10(11) CFU), Streptcoccus faecium (3.5 × 10(11) CFU) and Bifidobacterium bifidum (3.5 × 10(11) CFU)) on broiler performance. A total of 1200 one-day-old broilers were reared until 42 days of age, and distributed in a completely randomized experimental design with 3 treatments (antibiotic, probiotic and control) with 10 replicates of 40 birds each. Weight gain, feed intake, feed conversion ratio and mortality were evaluated. Concerning weight gain, in the periods of 0-7 and 0-14 days of age, the group fed the antibiotic product presented higher values as compared with the other treatments. However, in the periods of 0-21, 0-28 and 0-35 days of age, birds fed the antibiotic presented higher weight gain only in relation to the control group. Feed intake differences were detected only in the initial period of 0-7 days of age, with the group fed the antibiotic product presenting higher feed intake as compared with that fed the probiotic product, although these groups were not different from the control group. No statistical difference was detected in feed conversion ratio among treatments in any of the evaluated age intervals. Mortality was different only in the period of 0-14 days of age, which was higher in the control group as compared with that of the birds fed the probiotic product, but it was not different from the group receiving the antibiotic. Treatment with probiotic product containing Lactobacillus acidophillus, Streptococcus faecium and Bifidobacterium bifidum does not affect broiler performance