Exposure to progesterone previous to the protocol of ovulation synchronization increases the follicular diameter and the fertility of suckled Bos indicus cows

Theriogenology
L M S SimõesJ N S Sales

Abstract

The objective was to evaluate the effect of injectable progesterone previous to the timed artificial insemination (TAI) protocol on follicular growth, ovulation and pregnancy rate of suckled Bos indicus cows. In experiment 1, 10 days before the beginning to TAI protocol (D-10), 431 suckled-anestrus Nelore cows (249 multiparous and 182 primiparous), were allocated to one of three treatments groups (control, P4i and P4iGnRH). At this moment, cows in the P4i and P4iGnRH group received 150 mg of injectable progesterone intramuscularly (Sincrogest injetável®, Ouro Fino, Brazil). On Day 0 (D0), all cows were synchronized using an estradiol/progesterone-based TAI protocol. Simultaneously, in the P4iGnRH group, cows received 10 μg of Busereline intramuscularly (Sincroforte®, Ouro Fino, Brazil). Ultrasound exams were performed to evaluate the diameter of the largest follicle (D0, D8 and D10), ovulation rate and diameter of the corpus luteum (D24). In experiment 2, 681 suckled Nelore cows (356 multiparous and 325 primiparous) were synchronized using an estradiol/progesterone-based TAI protocol and received treatments similar to experiment 1. TAI was performed 48 h after removal of the progesterone (P4) device. Pregnancy diagnosis was 30 ...Continue Reading

References

Oct 1, 1979·Biology of Reproduction·R E ShortR A Bellows
Jan 1, 1992·Journal of Reproduction and Fertility·G P AdamsO J Ginther
Nov 1, 1990·Journal of Reproduction and Fertility·M G MurphyJ F Roche
Jan 1, 1996·Journal of Reproduction and Fertility·I Revah, W R Butler
Mar 25, 1999·Animal Reproduction Science·Z T Ruiz-Cortés, M Olivera-Angel
Sep 16, 2000·Theriogenology·Y Yavas, J S Walton
Jun 24, 2003·Animal Reproduction Science·G A BóM F Martínez
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Aug 28, 2016·Domestic Animal Endocrinology·O J Ginther

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