Energy balance, metabolic status, and the first postpartum ovarian follicle wave in cows administered propylene glycol.

摘要: Mature Holstein cows were drenched daily with either 500 mL of water (control; n = 28) or propylene glycol (PPG; from d 10 before parturition until 25 postpartum. Follicular development was monitored thrice weekly by transrectal ultrasound. Blood samples collected every 30 min a subset per treatment on -10, 2, and to assess glucose insulin response treatments, postpartum, blood for 12 h determine LH pulse profiles. Both elevated 2 following PPG administration, but only -10. On the number pulses, mean LH, amplitude not different between control cows. The proportion first postpartum dominant follicles that became ovulatory, atretic, cystic Despite evidence improved metabolic status, failed increase frequency, follicle waves resulting in ovulation. each cow retrospectively categorized as being ovulatory (n 17), nonovulatory high estradiol 6), low 24), 8). Differences dry matter intake energy balance among categories apparent early 3 wk parturition. had lower pre- compared also hormone metabolite profiles indicative more severe negative balance.