RESUMEN
A total of 224 weaned pigs (DanBred sows x PIC 337 sires) with an average body weight (BW) of 6.37 ± 0.34 kg (21 days of age) were used to evaluate how different levels of benzoic acid fed to weaning pigs orally inoculated with Escherichia coli (K88+ ) affected the nursing and grow-finishing performance, the physicochemical properties of the intestine, the volatile fatty acid concentration in the caecum and the incidence of diarrhoea. Pigs were randomly allocated in an experimental design of randomized blocks in a 4 × 2 factorial design, and they were administered four levels of benzoic acid (0.00%, 0.25%, 0.50% and 0.75%) and inoculated (or not) in two consecutive days with 1 ml solution containing 106 CFU/ml of E. coli (K88+ ). Seven replicates (pens) per treatment were used, and four animals were kept per pen. Supplementation with 0.75% benzoic acid promoted better performance (p < 0.05) in the nursery phase as well as in the subsequent phases until slaughter, and it decreased the incidence of diarrhoea in piglets (p < 0.05). In the piglets fed the benzoic acid diet, the villus height in the jejunum and ileum was greater until 42 days of life (p < 0.05), the crypt depth was decreased in the caecum (p < 0.05), and the butyric acid concentration was increased in the caecal content tendencially (p = 0.0708). In conclusion, supplementation with 0.75% benzoic acid has a positive effect on piglets by reducing diarrhoea, improving intestinal health and promoting the performance from weaning to finishing. Thus, benzoic acid can be considered a potential alternative that can replace growth-promoting antibiotics.
Asunto(s)
Ácido Benzoico/uso terapéutico , Diarrea/veterinaria , Infecciones por Escherichia coli/veterinaria , Escherichia coli/clasificación , Intestinos/efectos de los fármacos , Enfermedades de los Porcinos/microbiología , Alimentación Animal , Animales , Diarrea/tratamiento farmacológico , Diarrea/microbiología , Infecciones por Escherichia coli/tratamiento farmacológico , Contenido Digestivo/química , Concentración de Iones de Hidrógeno , Intestinos/patología , Masculino , Distribución Aleatoria , Porcinos , Enfermedades de los Porcinos/tratamiento farmacológicoRESUMEN
La tiña negra es una micosis cutánea superficial causada por un hongo levaduriforme denominado Hortaea werneckii, es frecuente en regiones cálidas y en zonas de playa. Se comunica su aislamiento de la palma de la mano de un niño sin antecedentes de contacto con fuente infecciosa ni de hiperhidrosis que fue tratado con pomada de Whitfield con azufre desapareciendo la lesión al mes sin recidivas. Se considera significativo presentar este caso dada la escasa frecuencia de su diagnóstico(AU)
Tinea nigra is a superficial cutaneous mycosis, caused by the yeasty-form fungus called Hortaea werneckii. It is frequent in warm regions and in beach zones. Its isolation in the hand palm of a boy without antecedents of infectious contact or hyperhidrosis is reported in this article. He was treated with an ointment of benzoic acid, salicylic acid and sulfur; lesions disappeared after a month without recurrence. The presentation of the case was considered significant due to the scarce frequency of this diagnose(AU)