Ceftiofur derivates in serum and endometrial tissue after intramuscular administration in healthy mares.

This research article reports on a study that investigated how much ceftiofur, a specific antibiotic, is present in the blood and endometrial tissue of healthy female horses after an intramuscular injection. The study’s ultimate goal was to see if the measured amount of ceftiofur would be adequate for the prevention of endometritis, a major disease problem in horse breeding.

Objective of the Study

• The main objective of this study was to determine the concentration levels of ceftiofur derivatives in the horse’s blood serum and endometrial tissue 24 hours after an intramuscular injection.
• The authors hypothesized that the amount of ceftiofur would remain above the minimum inhibitory concentration (MIC), the lowest concentration of an antibiotic that prevents bacterial growth, for harmful uterine bacteria for a full 24 hours after treatment.

Methodology

• Nine healthy female horses in estrus, their reproductive cycle’s active phase, were given a single dose of 2.2 mg/kg of ceftiofur hydrochloride injected into a muscle.
• To measure ceftiofur quantities, blood samples and endometrial tissue were collected immediately before giving the antibiotic and at two different time intervals (2 hours and 24 hours) afterward.
• Additional blood samples were collected 4 and 10 hours after treatment to monitor the ceftiofur’s presence.
• High-performance liquid chromatography (HPLC), a reliable analytical method, was used to identify ceftiofur derivatives present in the samples.

Results and Recommendations

• The levels of ceftiofur were highest in both blood and endometrial tissue 2 hours post-injection, while they were lowest 24 hours after treatment.
• The findings revealed that 24 hours after the antibiotic treatment, the level of ceftiofur in both serum and tissue was lower than after 2 hours, but still above the MIC for two common bacterial pathogens causing uterus infections in horses: Streptococcus equi zooepidemicus and Escherichia coli.
• This suggests that a single intramuscular dose of this specific antibiotic can’maintain efficient levels for 24 hours to inhibit common uterine pathogens, providing the basis for further investigation into its use for treating or preventing endometritis in horses.