Recent Developments in Oestrous Synchronization of Postpartum Dairy Cows with and without Ovarian Disorders

Yániz, J.L.; Murugavel, K. Kalidasa; López‐Gatius, F.

doi:10.1111/j.1439-0531.2004.00483.x

Cited by 55 publications

(39 citation statements)

References 90 publications

(175 reference statements)

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“…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%

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: 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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“…ovsynch) regulate ovarian functions and hence sexual cycles Tenhagen et al, 2004;Yàniz et al, 2004) and as a result the number of inseminations per pregnancy decreases (Tóth et al, 2006). The present study has also determined a decrease, though insignificant, in the number of inseminations per pregnancy following presynch-ovsynch protocol.…”

mentioning

confidence: 69%

Efficacy of the presynch-ovsynch program on some reproductive parameters in postpartum dairy cows

Aköz¹,

Aydın²,

Ali³

2008

Acta vet. (Beogr.)

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In this study, the aim was to evaluate the presynch-ovsynch protocol on the intervals from calving to first insemination, calving to pregnancy, calving to calving in postpartum lactating cows. Lactating Holstein cows (n=104, 3-5 years old, 450-500 kg BW, 27±3 kg/day average milk yield) were enrolled in the study 26-41 days postpartum. Fifty of them were taken as the control group and 54 of them were the treated experimental group. The control group was not treated and the cows in estrus were inseminated. In the treated group the cows were injected with two PGF2α for presynchronization twice at every 14 days. Fourteen days after the second PGF2α, ovsynch protocol was initiated (GnRH, day 0; PGF2α, day 7; GnRH, day 9) and cows were inseminated 12-16 hours after second GnRH injection. Following AI, cows returning to estrus were inseminated at detected heat. Pregnancy diagnosis was performed by ultrasonography at 33-38 days after AI. Calving to first AI (days), calving to pregnancy (day), the number of AI per pregnancy, calving interval (days) for control cows were 96.08±8.20, 147.58±9.95, 2.19±0.20 and 430.50±10.90 and for the treated group 70.13±1.13, 101.76±5.70, 1.85±0.12 and 386.80±5.70, respectively. Compared to the control group, calving to first AI interval was shorter by 26 days, calving to pregnancy interval by 46 days and the calving interval by 44 days (p<0.001). Number of AI per pregnancy decreased numerically from 2.19 to 1.85. Pregnancy rates for the first AI was 47% for the control and 43% for the treated cows (p>0.05). As a result, by using the presynch-ovsynch protocol, the need for estrus detection was eliminated and inseminations were performed at a fixed time. Therefore, calving to first AI, calving to pregnancy, calving intervals and the number of AI per pregnancy were improved to the benefit of the farm

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“…In anovulatory anestrus, exogenous progesterone applications can be very useful [84]. The use of intravaginal progesterone devices, such as PRID or CIDR, may induce the restart of cyclic activity in the ovary [13].…”

Section: Use Of Progesterone In Anestrus or Anovulatory Anestrusmentioning

confidence: 99%

Clinical Use of Progesterone and Its Relation to Oxidative Stress in Ruminants

Kuru¹,

Kükürt²,

Oral³

et al. 2018

Sex Hormones in Neurodegenerative Processes and Diseases

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Studies to determine the physiological effects and functions of progesterone started in the twentieth century. Progesterone is a steroid-structured hormone with 21 carbon atoms originating from cholesterol. The corpus luteum, formed after ovulation in ruminants, secretes progesterone, which plays a role in the continuity of the pregnancy. Progestagens can be used for estrus synchronization in cows and heifers. Similarly, they are used for estrus synchronization during the breeding season or outside the breeding season by taking advantage of the negative feedback effect of progesterone in small ruminants. It is applied for the treatment of embryonic deaths due to luteal insufficiency in cows with high milk yield. In anovulatory anestrus, exogenous progesterone applications can be very useful. Progesterone treatment contributes to the resolution of the anestrus by rearranging hypothalamic functions in cattle with follicular cysts. The oxidative stress index in the luteal phase, when progesterone is high in ruminants, is higher than in the follicular phase. In the critical period of pregnancy, a high index of oxidative stress-induced progesterone causes embryonic death. Factors that cause stress in high milk-yielding cows can affect the amount of progesterone synthesis by inhibiting luteal cell function due to excessive free radical production.

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Recent Developments in Oestrous Synchronization of Postpartum Dairy Cows with and without Ovarian Disorders

Cited by 55 publications

References 90 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

Efficacy of the presynch-ovsynch program on some reproductive parameters in postpartum dairy cows

Clinical Use of Progesterone and Its Relation to Oxidative Stress in Ruminants

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