Color Doppler flow imaging for the early detection of nonpregnant cattle at 20 days after timed artificial insemination.

The objective was to determine the accuracy of a pregnancy test for predicting nonpregnant cattle based on the evaluation of corpus luteum (CL) blood flow at 20 d (CLBF-d20) after timed artificial insemination (TAI). Crossbred Holstein-Gir dairy heifers (n=209) and lactating cows (n=317) were synchronized for TAI using the following protocol: intravaginal implant (1.0 g of progesterone) and 2mg of estradiol benzoate i.

[The stability of antibiotics administered in "and" with a parenteral nutrition mixture enriched with branched-chain amino acids. II. The cephalosporins].

Part I of these stability studies commented on the benefits, in terms of care and therapy, of the Y administration of antibiotics and parenteral nutrition. The aim of this study is to determine the stability of the cephalosporins ceftazidime, ceftriaxone, ceftizosime and cefotaxime in vitro, at therapeutic concentrations, infused together with a parenteral nutrition mixture with polyols, enriched in branched chained amino acids, and without lipids. A microbiological stability analysis was carried out on the antibiotics in the parenteral nutrition, and an HPLC aminogram was done to determine the concentration of amino acids in the infusion together with the antibiotic.