Effect of gonadotropin-releasing hormone administered at the time of artificial insemination for cows detected in estrus by conventional estrus detection or an automated activity-monitoring system

Hubner, A.M.; Canisso, Igor F.; Peixoto, P.M.; Conley, Alan J; Lima, F.S.

doi:10.3168/jds.2021-21011

Cited by 4 publications

(6 citation statements)

References 31 publications

(49 reference statements)

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“…The pregnancy improvement and the cost of the GnRH administration demonstrate that the second insemination cows gain more from the GnRH administration than the first insemination cows do. Hubner et al ( 32 ) observed no benefits of GnRH treatment at the A.I. time for cows diagnosed in estrus by traditional estrus detection or an automated activity-monitoring system, they reported pregnancy rates between 35 and 43% for treated cows and no treated cows.…”

Section: Discussionmentioning

confidence: 99%

“…The benefit of GnRH administration can be attributed to two factors: cows detected in estrus who fail to ovulate, 6.5–44% ( 33 , 34 ), or cows who have delayed ovulation (>35 h after estrus = 10%) ( 35 ). Since cows that do not ovulate are unable to become pregnant, increasing the ovulation rate would have an impact on the conception rate ( 32 ). As in our study, Burnett et al ( 36 ) showed that GnRH at the time of AI increased the pregnancy rate for cows found in estrus.…”

Section: Discussionmentioning

confidence: 99%

“…Hubner et al ( 32 ) reported a lower pregnancy rate for cows receiving the first service compared with herd mates receiving ≥2 services. In our study, the lower pregnancy rate was found in the third group (35 and 37%), in the case of the cows at the third insemination.…”

Section: Discussionmentioning

confidence: 99%

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Economical implications and the impact of gonadotropin-releasing hormone administration at the time of artificial insemination in cows raised in the extensive system in North Romania

Berean¹,

Bogdan²,

Opris³

et al. 2023

Front. Vet. Sci.

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Artificial insemination (AI) is the first and the most used biotechnologies in reproduction all over the world. Many studies reported the beneficial role of gonadotropin-releasing hormone (GnRH) administrated some hours before the AI or at the artificial insemination time. This study aimed to assess the effect of GnRH analogs given at the time of insemination on the first, second, and third AIs and to assess the economical implications of GnRH administration. We hypothesized that administration of GnRH at the time of insemination would increase ovulation and pregnancy rate. The study was conducted on small farms in northwestern Romania and included animals of the Romanian Brown and Romanian Spotted breeds. Animals in estrous at the first, second, and third inseminations were randomly divided into groups that received GnRH at insemination and groups that did not. A comparison between the groups was performed and the cost of GnRH administration to obtain one gestation was calculated. The GnRh administration increased the pregnancy rate at the first and the second inseminations by 12 and 18%, respectively. For one pregnancy, the cost of GnRH administration was approximately 49 euros for the first insemination group and around 33 euros for the second insemination group. No improvement of the pregnancy rate was observed after the GnRH administration for the cows at the third insemination, so, for this group, no economic statistics were performed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Economical implications and the impact of gonadotropin-releasing hormone administration at the time of artificial insemination in cows raised in the extensive system in North Romania

Berean¹,

Bogdan²,

Opris³

et al. 2023

Front. Vet. Sci.

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show abstract

“…Conversely, several studies have shown that administering GnRH at OE and AI time does not improve conception rates or fertility in dairy cows [ 23 , 31 , 32 , 35 ]. GnRH agonist, gonadorelin, has shown inconsistent effects on P/AI, possibly due to variations in GnRH potency or the timing of administration.…”

Section: Enhancing Ovulation Response and Conception Rates At The Ons...mentioning

confidence: 99%

“…Also, administering gonadorelin following estrous detection via the accelerometer system has no significant impact on fertility in dairy cows, regardless of standard or heat-stress conditions [ 23 ]. Furthermore, it is not recommended to use GnRH at the time of AI due to its inability to enhance fertility in dairy cows [ 32 , 35 ].…”

Section: Enhancing Ovulation Response and Conception Rates At The Ons...mentioning

confidence: 99%

Gonadotropin-Releasing Hormone (GnRH) and Its Agonists in Bovine Reproduction II: Diverse Applications during Insemination, Post-Insemination, Pregnancy, and Postpartum Periods

Hassanein,

Szelényi,

Szenci

2024

Animals

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The administration of GnRH and its agonists benefits various aspects of bovine reproductive programs, encompassing physiological stages such as estrous synchronization, post-insemination, pregnancy, and the postpartum period. The positive impact of GnRH administration in overcoming challenges like repeat breeder cows, early embryonic loss prevention, and the management of cystic ovarian disease (COD) is thoroughly surveyed. Furthermore, this review focuses on the significance of GnRH administration during the postpartum period, its role in ovulation induction, and how it enhances the productivity of embryo transfer (ET) programs. An emerging feature of this field is introduced, focusing on nano-drug delivery systems for GnRH agonists, and the potential benefits that may arise from such advancements are highlighted. While this review offers valuable insights into various applications of GnRH in bovine reproduction, it emphasizes the crucial need for further research and development in this field to advance reproductive efficiency and health management in dairy cattle.

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Geographical trends for automatic milking systems research in non-pasture-based dairy farms: A scoping review

Marques,

Lage,

Bruno

et al. 2023

Journal of Dairy Science

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Effect of gonadotropin-releasing hormone administered at the time of artificial insemination for cows detected in estrus by conventional estrus detection or an automated activity-monitoring system

Cited by 4 publications

References 31 publications

Economical implications and the impact of gonadotropin-releasing hormone administration at the time of artificial insemination in cows raised in the extensive system in North Romania

Economical implications and the impact of gonadotropin-releasing hormone administration at the time of artificial insemination in cows raised in the extensive system in North Romania

Gonadotropin-Releasing Hormone (GnRH) and Its Agonists in Bovine Reproduction II: Diverse Applications during Insemination, Post-Insemination, Pregnancy, and Postpartum Periods

Geographical trends for automatic milking systems research in non-pasture-based dairy farms: A scoping review

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