Follicular dynamic and relation cortisol-ovulatory response in cows treated with progesterone
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. No...
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| Autores principales: | , , |
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| Formato: | Artículo revista |
| Lenguaje: | Español |
| Publicado: |
Universidad Nacional del Nordeste
2021
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| Materias: | |
| Acceso en línea: | https://revistas.unne.edu.ar/index.php/vet/article/view/4727 |
| Aporte de: |
| Sumario: | 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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