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

S. A. González; J. A. Cabodevila; S. S. Callejas

doi:10.30972/vet.3124727

Authors

S. A. González Actividad privada, Tandil.
J. A. Cabodevila Fac. Cs. Vet. Univ. Nac. Centro Prov. Bs. As., Tandil. Centro Investig. Vet. Tandil (CONICET-CICPBA), Argentina.
S. S. Callejas Fac. Cs. Vet. Univ. Nac. Centro Prov. Bs. As., Tandil. Centro Investig. Vet. Tandil (CONICET-CICPBA), Argentina.

DOI:

https://doi.org/10.30972/vet.3124727

Keywords:

cows, progestorone, intravaginal device, cortisol, ovulation

Abstract

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 dynamic 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.

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