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

Reproduction in Domestic Animals = Zuchthygiene
Danilo Amadori Martins de OliveiraTácia Gomes Bergstein-Galan

Abstract

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 (ØPOF) 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 ØPOF 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 ...Continue Reading

References

Oct 24, 2001·Biology of Reproduction·R SartoriM C Wiltbank
Dec 14, 2002·Journal of Controlled Release : Official Journal of the Controlled Release Society·Michael J RathboneKim L Pickering
May 12, 2007·Society of Reproduction and Fertility Supplement·G A BóP S Baruselli
Apr 12, 2008·Reproduction, Fertility, and Development·E L GastalO J Ginther
Jun 9, 2009·Animal Reproduction Science·G A BridgesM L Day

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Citations

May 17, 2019·Reproduction in Domestic Animals = Zuchthygiene·Nilson Shonholzer FaleiroAntonio Humberto Hamad Minervino

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