The effect of the addition of antimicrobials on zootechnical and metabolic parameters in weaned piglets was evaluated. A total of 150 piglets were used, half weaned at 21 days and the other half at 28 days. Blood samples and weight control were taken on days 1, 15 and 30 post-weaning and daily controls of rectal temperature and occurrence of diarrhoea were recorded. The pigs were fed with a commercial diet and five treatments were used: D1 (basal diet); D2: addition of Zinc Bacitracin; D3: addition of Bacillus subtillis; D4; addition of oregano essential oil, D5: addition of organic acids. A completely random design was used in an arrangement of divided plots (five diets, three repetitions). The animals that consumed the D3 diet (with probiotic) had the best feed conversion ratio, the greatest body weight gain, the lowest severity index of diarrhoea (SID) and the best metabolic parameter...

Se evaluó el efecto de la adición de antimicrobianos sobre parámetros zootécnicos y metabólicos en lechones destetados. Se utilizaron 150 lechones, la mitad destetados a los 21 días y la otra mitad a los 28 días. Se tomaron muestras de sangre y control de peso los días 1, 15 y 30 posdestete y se hicieron controles diarios de temperatura rectal y presencia de diarrea. Los cerdos fueron alimentados con una dieta comercial basal y fueron distribuidos en cinco tratamientos: D1 (dieta basal); D2: adición de bacitracina de zinc; D3: adición de Bacillus subtillis; D4; adición de aceite esencial de orégano, D5: adición de ácidos orgánicos. Se utilizó un diseño completamente al azar en un arreglo de parcelas divididas (cinco dietas, tres repeticiones). Los animales que consumieron la dieta D3 (con probiótico) presentaron el mejor índice de conversión alimenticia, mayor gananci...