Pregnancy patterns during the early fetal period in high producing dairy cows treated with GnRH or progesterone

Bech-Sàbat, G.; López‐Gatius, F.; García-Ispierto, Irina; Santolaria, Jorge; Serrano, Beatriz; Nogareda, C.; Sousa, Noelita Melo de; Beckers, J. F.; Yániz, J.L.

doi:10.1016/j.theriogenology.2008.10.013

Cited by 20 publications

(20 citation statements)

References 42 publications

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“…Secondly, we evaluated the effect of accessory CL on progesterone concentration and conception. Several authors (López-Gatius et al 2004;Villarroela et al 2004;Larson et al 2007;Bech-Sàbat et al 2009;Mehni et al 2012;Pilz et al 2012) detected higher concentration of progesterone as well as higher conception rate in dairy cows after induction of accessory CL or application of depot forms of progesterone. The conception rate in cows treated by GnRH after AI was higher in the cows with a progesterone concentration above 3 ng/ml (40%) compared to the cows with progesterone below 3 ng/ml (18.2%) (Garcia-Inspierto and López-Gatius 2012).…”

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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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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“…Furthermore, in humans HCP 4 can be detrimental for implantation and maintenance of pregnancy without affecting embryo quality (Azem et al 2008). Concentrations of P 4 need to be within a precise physiological range during the early embryonic period (Stronge et al 2005) and late embryo-early fetal phase (Bech-Sàbat et al 2009) to avoid pregnancy failure in cattle. This probably also applies to buffaloes as a steady increase in P 4 concentrations from day 10 to 25 has been reported in pregnant buffaloes compared to non-pregnant animals and those with embryonic mortality (Vecchio et al 2009).…”

Section: Discussionmentioning

confidence: 99%

Efficiency of two timed artificial insemination protocols in Murrah buffaloes managed under a semi-intensive system in the tropics

Oropeza

Rojas

Velazquez

et al. 2010

Trop Anim Health Prod

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The objective of the study was to determine the efficiency of ovsynch (OV) versus presynch-ovsynch (P-OV) protocol for synchronization of ovulation and timed artificial insemination (TAI) in female buffaloes. The OV group (n = 40) received gonadotrophin-releasing hormone (GnRH) on day 0 (random day of the estrous cycle), prostaglandin PGF₂α on day 7 and a second GnRH administration on day 9 followed by a single artificial insemination (AI) 16-20 h later. The P-OV group (n = 40) received two PGF₂α injections 14 days apart, with the second injection administered 14 days before starting the OV protocol. Progesterone (P(4)) was measured at the time of PGF₂α administration (within the OV protocol) and AI. Neither ovulation rate ((24 h after TAI) OV 90%-36/40 vs. P-OV 85%-34/40) nor pregnancy rates ((day 60 after TAI) OV 35%-14/40 vs. P-OV 45%-18/40) differed between the two protocols. Pregnant buffaloes had lower concentrations of P(4) at AI compared with non-pregnant animals in the OV group (0.7 +/- 0.1 vs. 1.1 +/- 0.1 ng/ml); but in the P-OV group, differences did not reach statistical significance (0.8 +/- 0.1 vs. 1.0 +/- 0.1 ng/ml). This apparent trend reached statistical significance when the analysis was carried out in animals from both protocols (0.7 +/- 0.1 (pregnant) vs. 1.1 +/- 0.1 (non-pregnant) ng/ml). In conclusion, both protocols synchronize ovulation effectively with no significant differences in conception rates. High concentrations of P(4) at AI seem to be detrimental for the establishment of pregnancy in lactating buffalo cows.

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“…Some authors confirmed an increase of the conception rate by about 7-12% (Lopez- Gatius et al 2006;Bech-Sabat et al 2009;Mehni et al 2012), but mainly in stressed cows in extremely unfavourable conditions. Other authors did not demonstrate any effect of the treatment (Bartolome et al 2005;Szenci et al 2006;Ergene 2012).…”

Section: Discussionmentioning

confidence: 95%

“…Usual rates of early embryo doi: 10.17221/46/2016-CJAS mortality, late embryo/early fetal mortality, and late abortion in cows are 20-45%, 8-17.7%, and 1-4%, respectively (Humblot 2001). Insignificant lower late embryo/early fetal mortalities in the presence of accessory CL have been described by Bartolome et al (2006), Bech-Sabat et al (2009), andMusilova et al (2014). We did not find significant differences in pregnancy loss between treated cows bearing 1 or 2 CL in this trial either.…”

Section: Discussionmentioning

confidence: 99%

Induction of accessory corpus luteum by gonadorelin in relation to the time of treatment and the follicle size in inseminated cows

Doležel¹,

Chambert²,

Musilová³

et al. 2017

Czech J. Anim. Sci.

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Doležel R., Chambert C., Musilová D., Čech S., Páleník T. (2017): Induction of accessory corpus luteum by gonadorelin in relation to the time of treatment and the follicle size in inseminated cows. Czech J. Anim. Sci., 62,[195][196][197][198][199][200] This study evaluated the occurrence of two corpora lutea (CL) and the pregnancy rate in cows treated with gonadorelin on days 5, 6 or 7 after insemination in relation to the day of treatment and the size of the largest follicle on the ovaries at the time of treatment. Cows bearing one CL on days 5 (n = 40), 6 (n = 48), and 7 (n = 47) after insemination with defined size of the largest follicle on the ovaries (small ≤ 9 mm, n = 34; medium 10-14 mm, n = 59; large 15-20 mm, n = 42) were included in the study. Gonadorelin was administered after examination (day 0) and ultrasonographic examination was repeated on days 14, 28, and around day 90. The occurrence of 2 CL vs 1 CL was higher in pregnant cows on day 14 as well as on day 28 (86 vs 14% and 82.5 vs 14%, n = 57). Pregnancy rates on day 28 and around day 90 were higher in cows bearing 2 CL (n = 57) vs cows bearing 1 CL (n = 54) (82.5 vs 18.5% and 79.0 vs 18.5%, P < 0.001). The occurrence of 2 CL on day 28 was higher in cows treated on day 5 compared to cows treated on day 6 or 7 after insemination (60.0 vs 33.3 or 36.2%, P < 0.05). No significant differences in the number of CL and pregnancy rate were found in relation to follicle size at the time of treatment. Our results showed the higher efficiency of accessory CL induction by gonadorelin administration in cows treated on day 5 vs those treated on day 6 or 7 post insemination, however efficiency of the treatment was not influenced by the size of the largest follicle on the ovaries.

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Pregnancy patterns during the early fetal period in high producing dairy cows treated with GnRH or progesterone

Cited by 20 publications

References 42 publications

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

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

Efficiency of two timed artificial insemination protocols in Murrah buffaloes managed under a semi-intensive system in the tropics

Induction of accessory corpus luteum by gonadorelin in relation to the time of treatment and the follicle size in inseminated cows

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