The effect of equine chorionic gonadotropin on follicular size, luteal volume, circulating progesterone concentrations, and pregnancy rates in anestrous beef cows treated with a novel fixed-time artificial insemination protocol.

@article{DornelesTortorella2013TheEO,
  title={The effect of equine chorionic gonadotropin on follicular size, luteal volume, circulating progesterone concentrations, and pregnancy rates in anestrous beef cows treated with a novel fixed-time artificial insemination protocol.},
  author={Rodrigo Dorneles Tortorella and Rog{\'e}rio Ferreira and Joabel Tonellotto dos Santos and Olmiro Silveira de Andrade Neto and Marcos Henrique Barreta and Jo{\~a}o Francisco Oliveira and Paulo Bayard Gonçalves and Jairo Pereira Neves},
  journal={Theriogenology},
  year={2013},
  volume={79 8},
  pages={
          1204-9
        }
}
The objective was to determine the effects of eCG given on the day of, or 2 days before removal of an intravaginal progestin device, on ovarian follicle diameter, luteal volume, serum progesterone (P4) concentrations, and pregnancy per insemination in a fixed-time AI (FTAI) protocol. Lactating, anestrous, multiparous Bos taurus cross beef cows, 40 to 60 days postpartum, were given estradiol benzoate (2 mg im) and a progestin intravaginal device containing 250 mg of medroxyprogesterone acetate… Expand
Ovulatory response and luteal function after eCG administration at the end of a progesterone and estradiol' based treatment in postpartum anestrous beef cattle.
TLDR
The addition of eCG to a progesterone and estradiol' based treatment for FTAI improves ovulation rate and luteal function in anestrous cows, having implications in order to increase pregnancy rates in FTAI treatments in Bos taurus beef cattle. Expand
The Effect of Administering Equine Chorionic Gonadotropins (eCG) on Reproductive Performance of Dairy Cows with a CO-Synch + CIDR Protocol and Insemination at a Fixed Time
TLDR
The use of eCG, prior to termination of 7-day estrus synchronization when using the CO-Synch + CIDR program alone, could hasten the time of estrous expression and should be considered in FTAI dairy cows. Expand
Dynamics of follicular growth and progesterone concentrations in cyclic and anestrous suckling Nelore cows (Bos indicus) treated with progesterone, equine chorionic gonadotropin, or temporary calf removal.
TLDR
It is concluded that eCG treatment and TCR improved the fertility of anestrous cows by providing follicular growth rates and size of dominant follicles similar to cyclic cows. Expand
Consequences of eight consecutive applications of equine chorionic gonadotropin on ovarian follicle development and ovulation in bos indicus cows
TLDR
Estate of equine chorionic gonadotropin treatment increased CL size and ovulation rate even after 8 consecutive treatments, and consecutive treatments did not affect CL nor ovulation rates. Expand
Decreasing the dose of equine chorionic gonadotropin does not affect ovarian or pregnancy responses of purebred taurine and crossbred beef heifers.
TLDR
It is efficacious to reduce the dose of eCG to 300 or 200 IU in purebred taurine and crossbred beef heifers without negative effects on ovarian, estrous or pregnancy responses. Expand
Effect of Administering Equine Chorionic Gonadotropins ( eCG )
Equine chorionic gonadotropin (eCG) is synthesized by endometrial cups in pregnant mares and induces the formation of accessory corpora lutea. In cattle, eCG shows high Luteinizing hormone (LH) andExpand
Early postpartum administration of equine chorionic gonadotropin to dairy cows calved during the hot season: Effects on fertility after first artificial insemination.
TLDR
It is suggested that early postpartum eCG administration does not improve fertility of heat-stressed dairy cows as long as 60 days after AI, and other strategies may be more effective at mitigating the ability of post-partum heat stress to reduce fertility of high-producing dairy cows. Expand
Comparison of two timed artificial insemination system schemes to synchronize estrus and ovulation in Nellore cattle.
The aim of this study was to evaluate the reproductive performance of 411 Nellore cows (198 nulliparous, 80 primiparous, and 133 multiparous) submitted to the 5dCO-Synch + P4 or 7dEB + P4 systems.Expand
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
TLDR
Pregnancy per artificial insemination of cows subjected to synchronization and resynchronization in ovulation protocols using intravaginal progesterone-releasing insert before pregnancy diagnosis and the relationship of PR with the diameter of preovulatory follicles (ØPOF) before TAI is evaluated. Expand
Effect of equine chorionic gonadotropin on pregnancy rate in Brown Swiss cows under high altitude conditions
TLDR
In conclusion, the addition of 400 IU of eCG in an FTAI in cows under high altitude conditions and low body conditions can improve the fertility. Expand
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References

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TLDR
ECP and GnRH yielded comparable P/AI in Holstein cows receiving timed artificial insemination, however, eCG treatment at CIDR removal increased pregnancy rate in cows induced to ovulate with GnRH and in cows with lower BCS. Expand
Ovarian follicle diameter at timed insemination and estrous response influence likelihood of ovulation and pregnancy after estrous synchronization with progesterone or progestin-based protocols in suckled Bos indicus cows.
TLDR
Improving estrous responses between progesterone device withdrawal and FTAI and increasing the diameter of the LF at FTAI may be important aspects to achieve improved estrous synchronization responses and P/AI. Expand
Effects of estradiol and progestins on follicular regression before, during, and after follicular deviation in postpartum beef cows.
TLDR
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TLDR
In conclusion, temporary calf removal, eCG, or both did not significantly increase pregnancy rate to timed-insemination in a progesterone-based synchronization protocol in postpartum Nellore cows with acceptable body condition. Expand
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TLDR
The effects of eCG and presynchronization were not additive, and treatment with eCG had no effect on the diameter of the preovulatory follicle, or the response to PGF(2alpha) (Experiments 1 and 2), but tended to improve pregnancy rates. Expand
Effect of progesterone and/or estradiol treatments prior to induction of ovulation on subsequent luteal lifespan in anestrous Nelore cows.
TLDR
Both 3- and 6-day treatments with P(4) prior to induction of ovulation in anestrous Nelore cows increased percentage of normal luteal lifespan, while administration of 1mg of 17beta-E(2) or E( 2) cypionate failed to prevent occurrence of PL. Expand
Estradiol benzoate given 0 or 24 h after the end of a progestagen treatment in postpartum suckled beef cows.
TLDR
EB given 0 or 24h after the end of a progestagen treatment had the same effect on ovulation rate, time to ovulation, diameter of the ovulatory follicle, incidence of short-lived CL, luteal tissue area, and plasma progesterone concentrations of normal lifespan CL, and pregnancy rate after TAI in suckled beef cows. Expand
Reduction in size of the ovulatory follicle reduces subsequent luteal size and pregnancy rate.
TLDR
In conclusion, ovulation of smaller follicles produced lowered fertility possibly because development of smaller CL decreased circulating progesterone concentrations. Expand
Effect of increasing progesterone concentration from Day 3 of pregnancy on subsequent embryo survival and development in beef heifers.
TLDR
In conclusion, insertion of a PRID on Day 3 of the oestrous cycle increased serum progesterone concentrations on subsequent days, which, while having no phenotypic effect on embryonic development on Days 5 or 7, was associated with an increase in embryonic size on Days 13 and 16. Expand
Effects of oestradiol and some of its esters on gonadotrophin release and ovarian follicular dynamics in CIDR-treated beef cattle.
TLDR
Oestradiol treatments suppressed FSH in ovariectomised cows, with the duration of suppression dependent on the oestradio formulation and the effects of time, and a treatment-by-time interaction. Expand
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