What question did this study set out to answer?

To assess how delaying ovulation induction and timed artificial insemination in a Double-Ovsynch protocol impacts estrus expression, ovarian dynamics, and first-service pregnancy outcomes.

October 15, 2024Journal of Dairy ScienceOpen Access

Delaying induction of ovulation and timed artificial insemination in a Double-Ovsynch protocol increased expression of estrus and altered first-service reproductive outcomes of lactating dairy cows

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Authors

ALA. Laplacette CRC. Rial ESE.M. Sitko

Discussion

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Overview

Randomized trial reveals delayed ovulation induction increases estrus expression without altering overall pregnancy rates in dairy cows, suggesting estrus alerts identify highly fertile animals.

Key Points

To assess how delaying ovulation induction and timed artificial insemination in a Double-Ovsynch protocol impacts estrus expression, ovarian dynamics, and first-service pregnancy outcomes.
A total of 4,672 lactating Holstein cows across two commercial farms were synchronized with a Double-Ovsynch protocol and monitored using automated estrus detection sensors.
Cows were randomly allocated to receive final GnRH to induce ovulation at 56 hours (G56; n = 2,338) or 80 hours (G80; n = 2,334) after the initial prostaglandin injection, followed by timed AI ~16 hours later or AI upon detected estrus.
Ovarian response, luteal regression, and follicle development were evaluated using transrectal ultrasonography and circulating progesterone measurements.
Delaying ovulation induction in G80 significantly increased the proportion of cows expressing estrus and receiving insemination at detected estrus, but overall pregnancies per AI did not differ between G80 and G56.
Cows in G80 receiving timed AI without expressing estrus had lower pregnancy rates than G80 cows expressing estrus and all G56 cows, offsetting the reproductive gains seen in estrus-positive animals.
Cows exhibiting estrus had larger pre-ovulatory follicles (>16 mm), higher ovulation risks after insemination, more complete luteal regression, and elevated post-AI progesterone levels.

Cite This Study

Laplacette et al. (2024) studied this question.

synapsesocial.com/papers/6a82d7bb8757ed1e601347f3 https://doi.org/10.3168/jds.2024-24994

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October 15, 2024Journal of Dairy ScienceOpen Access

Delaying induction of ovulation and timed artificial insemination in a Double-Ovsynch protocol increased expression of estrus and altered first-service reproductive outcomes of lactating dairy cows

View Full Paper

Ask AI

Bookmark

Authors

ALA. Laplacette CRC. Rial ESE.M. Sitko

Discussion

Member takes

Overview

Randomized trial reveals delayed ovulation induction increases estrus expression without altering overall pregnancy rates in dairy cows, suggesting estrus alerts identify highly fertile animals.

Key Points

To assess how delaying ovulation induction and timed artificial insemination in a Double-Ovsynch protocol impacts estrus expression, ovarian dynamics, and first-service pregnancy outcomes.
A total of 4,672 lactating Holstein cows across two commercial farms were synchronized with a Double-Ovsynch protocol and monitored using automated estrus detection sensors.
Cows were randomly allocated to receive final GnRH to induce ovulation at 56 hours (G56; n = 2,338) or 80 hours (G80; n = 2,334) after the initial prostaglandin injection, followed by timed AI ~16 hours later or AI upon detected estrus.
Ovarian response, luteal regression, and follicle development were evaluated using transrectal ultrasonography and circulating progesterone measurements.
Delaying ovulation induction in G80 significantly increased the proportion of cows expressing estrus and receiving insemination at detected estrus, but overall pregnancies per AI did not differ between G80 and G56.
Cows in G80 receiving timed AI without expressing estrus had lower pregnancy rates than G80 cows expressing estrus and all G56 cows, offsetting the reproductive gains seen in estrus-positive animals.
Cows exhibiting estrus had larger pre-ovulatory follicles (>16 mm), higher ovulation risks after insemination, more complete luteal regression, and elevated post-AI progesterone levels.

Cite This Study

Laplacette et al. (2024) studied this question.

synapsesocial.com/papers/6a82d7bb8757ed1e601347f3 https://doi.org/10.3168/jds.2024-24994

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