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González, S.A.; Cabodevila, J.A.; Callejas, S.S.: Follicular dynamic and relation cortisol-ovulatory response in cows treatedwith progesterone. Rev. Vet. 31:2, 109-114, 2020. The objetives of the study were to evaluate whether treatment with intravaginal device (IVD) with different amount of progesterone (P4) affect P4 plasmatic concentration, follicular dy­ namic and ovulation rate; also, to determe the relationship between cortisol plasma level and ovulatory response. Non-suckling, cycling B. taurus beef cows were randomly allocated to groups: T0.558 (n=10) on day 0, IVD with 0.558 g of P4 was inserted and oestradiol benzoate (OEB) was administered. On day 8, IVD removal and D-cloprostenol administration. On day 9, OEB administration; T1 (n=10), same protocol but an IVD with 1 g of P4; T1.3 (n=10): same protocol but an IVD with 1.3 g of P4. The ovulation rate (66.7%), diameter of dominant follicle and P4 levels were not different among treatments (p>0.05). Cortisol levels were higher in cows that not ovulated on days 8 and 9 (p<0.05). In conclusion, IVD with 0.558, 1 and 1.3 g produce similar P4 levels and ovarian changes. Cortisol levels were higher in animals that did not ovulate, this being a possible indicator of stress, which can affect reproductive efficiency.

Dinámica folicular y relación cortisol-respuesta ovulatoria en vacas tratadas con diferentes cantidades de progesterona