Effects of administration of gonadotropin-releasing hormone at artificial insemination on conception rates in dairy cows

Shephard, Richard; Morton, John M.; Norman, Scott

doi:10.1016/j.anireprosci.2013.11.004

Cited by 13 publications

(15 citation statements)

References 14 publications

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“…Pregnancy rates were not different between cows in the control, CIDR, and hCG groups ( P > 0.05); however, percent pregnancy rate was lower ( P < 0.05) in the GnRH group when compared to the control and CIDR groups. Other investigators have also observed a negative effect on conception rates in lactating dairy cows receiving treatment with GnRH right after artificial insemination [ 36 ]. Nevertheless, it has been shown to improve conception rate in repeat-breeder dairy cows when injected at the time of the fourth insemination [ 37 ].…”

Section: Resultsmentioning

confidence: 99%

Dynamics of Progesterone, TNF-α, and a Metabolite of PGF2α in Blood Plasma of Beef Cows following Embryo Transfer

Mason

Copeland

Cuadra

et al. 2014

Veterinary Medicine International

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Lactating beef cows previously synchronized for estrus (d 0) were assigned to four treatments to assess their effectiveness in increasing blood progesterone (P4) and its effects on tumor necrosis factor-α (TNF-α) and prostaglandin F2α (PGF2α) after the transfer of embryos. At the time of transfer (d 7), cows received no treatment (control; n = 16), a controlled internal drug releasing device (CIDR; n = 16), human chorionic gonadotropin (hCG; n = 15), or gonadotropin releasing hormone (GnRH; n = 15). Blood samples were taken on d 7, 14, and 21 for analysis of P4 and tumor necrosis factor-α (TNF-α). Blood was collected (every 15 min for 2 h) in half the animals in each treatment group on d 14 and the remaining half on d 21 for analysis of prostaglandin F2α metabolite (PGFM). Retention rates were 56.2, 62.5, 46.7, and 13.3% for cows in the control, CIDR, hCG, and GnRH groups, respectively. Progesterone was greater (P ≤ 0.05) in cows receiving hCG compared to others on d 14. Progesterone in all treatment groups increased from d 7 to d 14 and declined (P ≤ 0.05) from d 14 to d 21. Contrary to pregnant cows, P4 and TNF-α declined from d 7 to d 21 in nonpregnant cows (P ≤ 0.05). Although PGFM increased by d 21, there was no difference between pregnant and nonpregnant cows.

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Section: Resultsmentioning

confidence: 99%

Dynamics of Progesterone, TNF-α, and a Metabolite of PGF2α in Blood Plasma of Beef Cows following Embryo Transfer

Mason

Copeland

Cuadra

et al. 2014

Veterinary Medicine International

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“…Hal ini sesuai dengan pendapat Thatcher et al (1993) dan Schneider et al (2006), bahwa pemberian GnRH segera setelah dilakukan IB akan memacu pengeluaran LH dari pituitaria anterior dan ini akan menyebabkan folikel de Graff mengalami ovulasi. Pendapat senada juga disampaikan oleh Shephard et al (2013), bahwa pemberian GnRH pada saat IB akan mampu meningkatkan fungsi korpus luteum, meningkatkan kadar progesteron, dan mencegah terjadinya kematian embrio dini. Kemungkinan salah satu penyebabnya adalah sapi tersebut estrus tetapi tidak mengalami ovulasi atau dengan kata lain anovulasi atau mungkin saja sapi mengalami ovulasi namum perkembangan fungsi korpus luteum kebuntingan tidak maksimal.…”

Section: Hasil Dan Pembahasanunclassified

Pengaruh Pemberian GnRH pada Sapi Potong yang Mengalami Kawin Berulang (Repeat Breeding)

Prihatno

Gustari

Kusumawati

et al. 2021

Jurnal Sain Veteriner

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Repeat breeding is a condition in which cows have normal estrous cycles and have been mated 3 times or more but are not pregnant. The incidence of repeat breeding in beef cattle can be detrimental to breeders in terms of time, that the calving period becomes longer so that the cows cannot give birth to calves once a year. Various ways to deal with repeat breeding have been done, but the results are not optimal. This study was conducted to determine the effect of Gonadotrophin Releasing Hormone (GnRH) in cows with repeat breeding. A total of fifteen beef cattle with repeat breeding were used in this study. The cows were divided into 3 groups of 5 each. Cows that were estrus in the first group (as a control group) were only performed artificial insemination (AI) without GnRH injection. In the second and third groups, after AI, they were injected with GnRH at AI time and 3-4 days after AI with a dose of 5 ml (Fertagyl®, 500 µg gonadorelin) intramuscularly. A pregnancy examination was carried out three months later and the results were recorded. The data obtained were analyzed descriptively and quantitatively using Chi-Square statistical analysis. The results of the analysis showed that there were differences in the pregnancy rate in the first group (control) with the second cow group and the third cow group, which were 20%, 80%, and 60% respectively. Based on statistical analysis, there was a significant difference in pregnancy rate (P <0.05) between the three groups. It was concluded that GnRH administration could increase the pregnancy rate in beef cattle that had repeat breeding.

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“…Dadurch lässt sich ermitteln, welche Tiergruppen tatsächlich verzögerte Ovulationen aufweisen, bei welchem Anteil durch eine GnRH-Applikation eine zeitgerechte Ovulation ausgelöst werden kann und welchen Einfluss dies auf die Fertilitätsparameter hat. Allerdings ist dabei zu beachten, dass positive Effekte einer GnRH-Applikation zum Zeitpunkt der Besamung möglicherweise nicht ausschließlich auf eine Verkürzung des Zeitintervalls zwischen Besamung und Ovulation zurückzuführen sind, sondern auch auf eine verbesserte Oozytenreifung und/oder nachfolgend verbesserte Gelbkörperfunktion (32). Weiterhin bleibt zu untersuchen, warum die Art der Brunst lediglich bei der BN 3 die TW beeinflusste.…”

Section: Gnrh0unclassified

Einsatz von Gonadorelin[6-D-Phe] am Tag 0 oder 12 post inseminationem zur Steigerung der Konzeptionsrate in einer sächsischen Milchviehgroßanlage

Freick¹,

Weber²,

Passarge³

et al. 2014

Tierarztl Prax Ausg G

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Effects of administration of gonadotropin-releasing hormone at artificial insemination on conception rates in dairy cows

Cited by 13 publications

References 14 publications

Dynamics of Progesterone, TNF-α, and a Metabolite of PGF2α in Blood Plasma of Beef Cows following Embryo Transfer

Dynamics of Progesterone, TNF-α, and a Metabolite of PGF2α in Blood Plasma of Beef Cows following Embryo Transfer

Pengaruh Pemberian GnRH pada Sapi Potong yang Mengalami Kawin Berulang (Repeat Breeding)

Einsatz von Gonadorelin[6-D-Phe] am Tag 0 oder 12 post inseminationem zur Steigerung der Konzeptionsrate in einer sächsischen Milchviehgroßanlage

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