Effects of an agonist of gonadotrophin releasing hormone (Buserelin) in cattle. III. Pregnancy rates after a post-insemination injection during metoestrus or dioestrus

Kl, Macmillan; Taufa, V.K.; Day, A.M.

doi:10.1016/0378-4320(86)90096-5

Cited by 88 publications

(26 citation statements)

References 14 publications

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“…There was no effect of the protocols on the days of collection and neither of the interaction treatment x day (P> 0.05), however there was effect of day (P <0.05), as reported by Mann et al (1995) and Szenci et al (2006). On the other hand, Macmillan et al (1986), Lajil, et al (1991 and Lopez-Gatius et al (2006) showed that a single dose of GnRH at the AI can increase the serum concentration of P4 and the number of accessory corpora lutea in pregnant MOURA, G.S. et al Pregnancy rate in crossbred cows subjected to FTAI protocol and application of a GNRH analog 12 days after AI.…”

Section: Resultsmentioning

confidence: 59%

“…1213, 2011 pregnancy rate at the first service. However, other studies revealed an increase in pregnancy rates in cows treated with 10 -250 µg of GnRH analog in the diestrus period (at the time of AI or 12 days after AI) (Macmillan et al 1986;Lajil et al, 1991, Lopez-Gatiuz et al, 2006. According to Thatcher et al (1989), Chenault et al (1990) and Yániz et al (2004), the positive effect of…”

Section: Resultsmentioning

confidence: 99%

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Taxa de prenhez em vacas mestiças submetidas ao protocolo de IATF e aplicação de análogo de GnRH 12 dias após a IA

Moura¹,

Torres²,

Oliveira³

et al. 2015

Pubvet

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This study aimed to evaluate the effect of GnRH administered 12 days after FTAI on pregnancy rate and progesterone levels in crossbred beef cows. Fifty-nine non-pregnant crossbred cows (Bos taurus indicus x Bos taurus taurus) previously selected by gynecologic examination with a body condition score (BCS) of 3.0 (scale of 1 - 5). Cows were randomly assigned to two treatments: TEB (n = 30), on day 0, an intravaginal progesterone releasing device (Primer®) was inserted and cows received i.m. 2.0 mg of estardiol benzoate (EB, Estrogin®); on day 8, the PRIMER was removed and cows received i.m. 300 IU of eCG (Novormon®) and 0.15 mg of PGF2α (Prolise®); on day 9, cows received i.m. 1 mg of EB. FTAI was carried out 48-56 hours after PRIMER removal; and TEBGnRH12 (n = 29): similar protocol to TEB, but with administration of 25 µg GnRH (Lecirelin, Gestran Plus®) on the 12th day after AI. On the 35th day after AI, diagnosis of pregnancy was performed by transrectal ultrasound. The pregnancy rate was analyzed by logistic regression. The results showed that 53.33% of the cows (16/30) in TEB and 37.93% (11/29) in TEBGnRH12 became pregnant after the first service. No significant difference was found among the pregnancy rate of animals in the treatments (P> 0.05). There was no difference between the P4 concentrations (TEB = 3.88 ng/mL and TEBGnRH12 = 3.12 ng/mL) among the heifers in the treatments (P> 0.05). The administration of GnRH analogs 12 days after TAI did not influence pregnancy rate or the progesterone concentration.

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Section: Resultsmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Taxa de prenhez em vacas mestiças submetidas ao protocolo de IATF e aplicação de análogo de GnRH 12 dias após a IA

Moura¹,

Torres²,

Oliveira³

et al. 2015

Pubvet

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“…Various terms of treatment have been tested in previous studies. MacMillan et al (1986) found the highest efficiency of treatment on days 11-13 after insemination. The occurrence of two CL was 15% in cows treated on days 0 and 12 (López-Gatius et al 2006), 50% in cows treated on day 5 (Garcia-Inspierto and López-Gatius 2012) and 17.7% in cows treated on days 28-34 (Bech-Sàbat at al.…”

Section: Discussionmentioning

confidence: 99%

Induction of accessory corpus luteum in cows by gonadotropin-releasing hormone administrated after insemination

et al. 2014

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Sufficiency of progesterone limits conception rate in dairy cows. This study evaluates the effect of gonadotropin-releasing hormone on induction of accessory corpus luteum, progesterone concentrations and pregnancy in dairy cows. The hormone (0.05 mg) was administrated intramuscularly to cows with one corpus luteum on day 5-7 (Group E1, n = 57) or 11-13 (Group E2, n = 40) after insemination; control groups C1 (n = 54) and C2 (n = 41) were not treated. Detection of pregnancy by ultrasound examination and measurement of serum progesterone concentration was performed on day 25-39 and around day 90 after insemination. The occurrences of two corpora lutea in groups E1 and E2 versus C1 and C2 were 43.9% and 33.5% vs. 3.7% and 9.8% (P < 0.001). Progesterone concentrations were 5.9 ± 2.92 ng/ml and 7.8 ± 2.35 ng/ml in untreated and treated cows (P = 0.016), respectively. Conception rates in groups E1 and E2 were 100% and 86.7% in cows bearing two corpora lutea, and only 16.7% and 38.9% in cows bearing one corpus luteum (P < 0.01); similarly as in groups E1 and E2 compared to groups C1 and C2 (49.1% and 50% vs. 50% and 31.7%). Pregnancy rates around day 90 in groups E1 and E2 compared to groups C1 and C2 were 45.6% and 45% vs. 42.6% and 26.8%, respectively. Administration of gonadotropin-releasing hormone on day 5-7 or 11-13 after insemination was efficient to induce accessory corpus luteum and increase the concentration of serum progesterone but had no effect on the conception rate.

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“…The scientific rationale for this treatment is to enhance embryo survival rates by delaying the luteolytic mechanism [91] which sometimes occurs by failure in maternal recognition of pregnancy. Some studies reported significant improvements of 10 to 12% in PRs [92][93][94] while others did not [95][96][97]. According to a recent study [98], treatment with GnRH at AI and 12 days later increased the PR in high yielding dairy cows during warm season.…”

Section: Preventive Pharmaceutical Treatment In Mid Luteal Phase Post-aimentioning

confidence: 98%

Recent Possibilities for the Diagnosis and Pharmacological Control of Pregnancy Loss in Dairy Cow

Szenci¹

2015

JLS

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Abstract:One of the most recent techniques for the diagnosis of EP (early pregnancy) in cattle on the farm is B-mode ultrasonography. Under field conditions, acceptable results may be achieved with ultrasonography from days 25 to 30 post-AI. The reliability of the test greatly depends on the frequency of the transducer used, the skill of the examiner, the criterion used for a positive PD (pregnancy diagnosis) and the position of the uterus in the pelvic inlet. Pregnancy protein assays (PAG, PSPB) may provide an alternative method to ultrasonography for determining EP or LEM/EFM (late embryonic/early foetal mortality) in the cow. Although early pregnancy factor is the earliest specific indicator for fertilization, its detection is entirely dependend on the use of the RIT (rosette inhibition test), therefore its use in the field needs further inventions. Preventive pharmaceutical treatments with hCG (human chorionic gonadotropin), GnRH (gonadotropin realising hormone), PRID (progesterone-releasing intravaginal device) or CIDR (controlled internal drug release) inserts at different time periods at or post-AI may have some benefit in decreasing PL (pregnancy loss), however further examinations are warranted to determine how and when these treatments may influence PL in the field.

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Effects of an agonist of gonadotrophin releasing hormone (Buserelin) in cattle. III. Pregnancy rates after a post-insemination injection during metoestrus or dioestrus

Cited by 88 publications

References 14 publications

Taxa de prenhez em vacas mestiças submetidas ao protocolo de IATF e aplicação de análogo de GnRH 12 dias após a IA

Taxa de prenhez em vacas mestiças submetidas ao protocolo de IATF e aplicação de análogo de GnRH 12 dias após a IA

Induction of accessory corpus luteum in cows by gonadotropin-releasing hormone administrated after insemination

Recent Possibilities for the Diagnosis and Pharmacological Control of Pregnancy Loss in Dairy Cow

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