Resynchronization of ovulation with new and reused intravaginal progesterone‐releasing devices without previous pregnancy diagnosis in Bos taurus indicus cows subjected to timed‐artificial insemination
| Autor: | Marcio Saporski Segui, Danilo Amadori Martins de Oliveira, Victor Breno Pedrosa, Romildo Romualdo Weiss, Luiz Ernandes Kozicki, Tácia Gomes Bergstein-Galan, Francisco Romano Gaievski |
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| Rok vydání: | 2019 |
| Předmět: |
Ovulation
Pregnancy Rate medicine.medical_treatment media_common.quotation_subject Andrology chemistry.chemical_compound Endocrinology Ovulation Induction Pregnancy medicine Animals Insemination Artificial Progesterone media_common Estradiol business.industry Artificial insemination Previous pregnancy Significant difference Cloprostenol Estradiol cypionate medicine.disease chemistry Estradiol benzoate Cattle Female Animal Science and Zoology Estrus Synchronization business Biotechnology medicine.drug |
| Zdroj: | Reproduction in Domestic Animals. 54:779-785 |
| ISSN: | 1439-0531 0936-6768 |
| Popis: | The study aimed to evaluate pregnancy per artificial insemination (P/AI) of cows subjected to synchronization and resynchronization in ovulation protocols using intravaginal progesterone-releasing insert (P4) before pregnancy diagnosis (PD) and the relationship of PR with the diameter of preovulatory follicles (OPOF) before TAI. Cows (n = 378) were distributed into two groups: a resynchronization group with new devices (GRN; n = 185) and resynchronization group with used devices (GRU; n = 193). On Day 0, both groups received a new P4 and estradiol benzoate (EB). On D8, P4 removal + D-cloprostenol + eCG + estradiol cypionate (EC) was done. On d10, TAI was conducted. On d32, cows were resynchronized and divided into two groups, GRN (n = 185) and GRU (n = 193). The GRN group received a new P4 + EB, and the GRU group received a used P4 + EB. On d40, the P4 was removed + PD. The non-pregnant cows received D-cloprostenol + eCG + EC. US was done again on d42 to determine OPOF before the second TAI. The P/AI of the GRN and GRU groups after synchronization were 56.2% and 57.0% (p = 0.87), respectively, and those after resynchronization were 58.0% and 37.3% (p < 0.008), respectively. The P/AI of the GRN and GRU groups observed after TAI (synchronization + resynchronization) were 81.6% and 73.1%, respectively (p = 0.047). No difference (p = 0.067) in OPOF between the pregnant and non-pregnant cows in the GRN was found, whereas the GRU group showed a significant difference (p = 0.003). Resynchronization protocols optimized the P/AI in both groups. New intravaginal devices resulted in greater P/AI and P/AI accumulation in resynchronization as compared with the GRU; the OPOF was related with P/AI. |
| Databáze: | OpenAIRE |
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