RESUMO
The objective of this study was to investigate the influence of two cleaning and disinfection programs on broiler performance and on the microbiological status of the facilities. This trial was an observational study of comparative character. Two experiments were conducted, with 960 birds each. Both experiments were carried out in a positive-pressure broiler house. Broilers were distributed in pens equipped with a bell drinker and a tube feeder each. In the first experiment, new wood shavings were used as litter material, and in the second, reused wood shavings were used. Two treatments with16 replicates of 30 birds each were evaluated. The regular treatment consisted of dry and wet organic matter removal, followed by washing. The European treatment consisted of dry organic matter removal, humidification, washing with water under high pressure, detergent application, rinsing, and application of two combined disinfectants: glutaraldehyde 250g/L + formaldehyde 185g/L; p-chlor-m-cresol 210 g/L. Biosecurity measures were adopted during daily management tasks to prevent cross contamination between treatments. The effectiveness of the treatments was evaluated by microbiological analysis performed before and after treatment applications, as well as by broiler performance results. Live performance results were similar between both treatments when broilers were reared on new litter. When reused word-shavings were used as litter material, the European treatment promoted better broiler performance. The European treatment was more effective than the regular treatment in reducing total microbial counts in the facilities when reused wood shavings were used as litter material, and positively influenced broiler performance.
Assuntos
Animais , Galinhas/microbiologia , Desinfetantes/análise , Desinfetantes/efeitos adversosRESUMO
The objective of this study was to investigate the influence of two cleaning and disinfection programs on broiler performance and on the microbiological status of the facilities. This trial was an observational study of comparative character. Two experiments were conducted, with 960 birds each. Both experiments were carried out in a positive-pressure broiler house. Broilers were distributed in pens equipped with a bell drinker and a tube feeder each. In the first experiment, new wood shavings were used as litter material, and in the second, reused wood shavings were used. Two treatments with16 replicates of 30 birds each were evaluated. The regular treatment consisted of dry and wet organic matter removal, followed by washing. The European treatment consisted of dry organic matter removal, humidification, washing with water under high pressure, detergent application, rinsing, and application of two combined disinfectants: glutaraldehyde 250g/L + formaldehyde 185g/L; p-chlor-m-cresol 210 g/L. Biosecurity measures were adopted during daily management tasks to prevent cross contamination between treatments. The effectiveness of the treatments was evaluated by microbiological analysis performed before and after treatment applications, as well as by broiler performance results. Live performance results were similar between both treatments when broilers were reared on new litter. When reused word-shavings were used as litter material, the European treatment promoted better broiler performance. The European treatment was more effective than the regular treatment in reducing total microbial counts in the facilities when reused wood shavings were used as litter material, and positively influenced broiler performance.(AU)
Assuntos
Animais , Galinhas/microbiologia , /efeitos adversos , /análise , Desinfetantes/efeitos adversos , Desinfetantes/análiseRESUMO
Postnatal mouse pancreas growth was submitted to allometric analysis by the Wald nonparametric method, modified by Bartlett. The body and gland mass were obtained and the total cell number and the absolute compartmental volumes of acini, ducts and stroma were evaluated by morphometric methods. The allometric coefficients were calculated for the growths between the following parameters: a) pancreatic mass and body mass; b) acinar compartmental volume and body mass; c) ductal compartmental volume and body mass; d) stroma volume and body mass; e) total cell number and body mass; and f) acinar volume and stroma volume. The results of these analysis showed that the pancreatic mass, total cell number and stroma volume exhibited statistically significant allometric growths with a monophasic pattern and allometric coefficients of 1.56, 1.27 and 1.29, respectively, for the periods of 2 to 70, 2 to 28 and 2 to 70 days of age; while the growth of compartmental acinar volume in relation to body mass and compartmental stroma volume was biphasic. In the first case, the 1st phase occurred between 2 to 14 days (K = 1.09) and the 2nd phase between 14 to 70 days (K = 1.44) and in the second case, the 1st and 2nd phases occurred, respectively, between 2 to 28 days (K = 1.31) and 28 to 70 days (K = 0.79) of age. The growth of ductal volume in relation to body mass was also biphasic with a 1st phase between 2 to 14 days (K = 0.88) and a 2nd phase between 14 to 70 days (K = 1.07). These results permitted us to conclude that the growth of the mouse pancreas is allometrically associated with the growth of body mass.