Effect of aglepristone (RU534) administration during follicular phase on progesterone, estradiol-17β and LH serum concentrations in bitches

Aglepristone was administered in bitches during the follicular phase to evaluate its effects on progesterone, estradiol-17β and LH serum concentrations. Ten German Shepherds were divided into two groups (treated n=5; control n=5). Treated bitches received 10mg/kg BW of aglepristone subcutaneously during the early follicular phase, 24hr after and then 7days later. The control group was injected, at the same time periods, with saline solution (0.3ml/kg BW). For the steroid evaluations, blood was collected daily from the onset of proestrus until the first day of cytological dioestrus. For LH base-line serum determination, blood was also collected every 20min for 2hr at the onset of proestrus. For LH surge identification, blood was collected daily (every 6hr) starting from the day of the first administration of aglepristone or saline solution until the first day of dioestrus. All animals ovulated but the treated group presented longer ovulation-dioestrus intervals than the control group (5.2±2.2days p&nbsp