Resumen 17. El objetivo del presente trabajo fue estudiar la eliminación de oxitetraciclina (OTC) y fosfomicina (FOS) en calostro y leche de cerda, su impacto sobre algunos aspectos microbiológicos y morfo-fisiológicos intestinales, así como parámetros zootécnicos de la camada. Se analizaron muestras de calostro y leche de cerdas tratadas durante el peri-parto con OTC solución y FOS disódica vía intramuscular. Se evaluó la ingesta de calostro con concentraciones residuales de antibióticos, así como parámetros intestinales y zootécnicos de lechones lactantes. Las concentraciones medias residuales de OTC y FOS en calostro/leche fueron 0,48 y 1,55 qg/ml y la ingestión media de antibiótico/lechón fue de 0,13 y 0,50 mg/kg peso vivo, respectivamente. Si bien la ingestión de calostro con residuos de FOS mostró menor impacto que OTC sobre los aspectos microbiológicos y morfo-fisiológicos, así como sobre la bioquímica enzimática intestinal de lechones lactantes, ambos antibióticos no afectaron los resultados de los parámetros zootécnicos de las camadas. No obstante, las bajas concentraciones de antibióticos ingeridos con el calostro serían un potencial riesgo de desarrollo de resistencia bacteriana, por lo cual la aplicación profiláctica de los mismos durante el periparto debería ser reconsiderada.

Abstract 21. The objective ofthis workwas to study the elimination of oxytetracycline (OTC) and fosfomycin (FOS) in sow colostrum/milk and its impact on some microbiological aspects and on intestinal morpho-physiological and zootechnical parameters of the litter. Colostrum/milk samples from sows treated during the period of delivery with OTC solution and disodium FOS by the intramuscular route were analyzed. Colostrum intake with residual concentrations of antibiotics and intestinal and zootechnical parameters of suckling piglets, were evaluated. The mean residual concentrations of OTC and FOS in colostrum/milk were 0.48 and 1.55 qg/ml and the average antibiotic intake/piglet was 0.13 and 0.50 mg/kg body weight, respectively. While ingestion of colostrum with FOS residues showed less impact than OTC on the microbiological, morpho-physiological and intestinal enzymatic biochemistry of suckling piglets, any of the antibiotics affected the zootechnical parameters of the litters. Nevertheless, the low concentrations of antibiotics ingested with colostrum would be a potential risk of developing bacterial resistance, thus their prophylactic administration during the peri-partum should be reconsidered.

In this study the kinetics of oil extraction from partially dehulled safflower seeds under two moisture conditions (7 and 9% dry basis) was investigated. The extraction assays were performed using a stirred batch system, thermostated at 50 ºC, using n-hexane as solvent. The data obtained were fitted to a modified diffusion model in order to represent the extraction kinetics. The model took into account a washing and a diffusive step. Fitting parameters were compared statistically for both moisture conditions. The oil yield increased with the extraction time in both cases, although the oil was released at different rates. A comparison of the parameters showed that both the portion extracted in the washing phase and the effective diffusion coefficient were moisture-dependent. The effective diffusivities were 2.81 10-12 and 8.06 10-13 m²s-1 for moisture contents of 7% and 9%, respectively.